CN208678191U - Radiotherapy head and radiotherapy unit - Google Patents
Radiotherapy head and radiotherapy unit Download PDFInfo
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- CN208678191U CN208678191U CN201820491716.XU CN201820491716U CN208678191U CN 208678191 U CN208678191 U CN 208678191U CN 201820491716 U CN201820491716 U CN 201820491716U CN 208678191 U CN208678191 U CN 208678191U
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Abstract
This application discloses a kind of radiotherapy head and radiotherapy units, belong to field of medical technology.The radiotherapy head includes: radiographic source and example of primary collimator；Radiographic source is for issuing radioactivity beam；Multiple primary collimating channel groups are provided in example of primary collimator, each primary collimating channel group includes at least one primary collimating channel, and radiographic source can be relatively moved with example of primary collimator, so that the beam that radiographic source issues may pass through any primary collimating channel；The field area that primary collimating channel of the beam that radiographic source issues by different primary collimating channel groups is formed on the reference plane is of different sizes.Present application addresses the problems that treatment head flexibility is poor, improve the flexibility for the treatment of head.The application is used for radiotherapy.
Description
Technical field
This application involves field of medical technology, in particular to a kind of radiotherapy head and radiotherapy unit.
Background technique
Accelerator is generally made of electron gun, bremstrahlen target and guiding device, which accelerates to phase for electronics
To speed is discussed, electron beam is directed to generate X beam on bremstrahlen target, the guiding device is for guiding X beam, with shape
At the beam for meeting specific needs.
Accelerator is used for the radiotherapy of tumour, and as shown in Figure 1a, electron gun 1 is closed in a vacuum chamber, should
Vacuum chamber has outer wall 3, and the electron beam 2 that electron gun 1 issues is beaten on bremstrahlen target 4, issues X beam, and X beam passes through
Example of primary collimator 5 issues after being formed conical beam 6 by beam.When carrying out radiotherapy, in order to enable beam and tumour shape
Shape matches, and is additionally provided with other collimator apparatus 7 to the further beam shape of beam 6.Due to not of uniform size, the existing radiotherapy of tumour
Equipment, in order to be suitable for the treatment of tumour of different sizes, so that X beam forms penetrating for cone by beam by example of primary collimator 5
Beam 6 is larger, the launched field for being projected as D*D in reference planes 8.
The launched field of generally 40*40 square centimeters of projection of the existing radiotherapy apparatus in reference planes 8, and clinically,
Only 5% or so tumour needs 40*40 square centimeters of launched field to carry out radiotherapy.And works as and use the radiotherapy apparatus to 95%
Little tumour when carrying out radiotherapy, on the one hand, since the beam 6 of the cone formed by 5 beam of example of primary collimator larger is led
The dosage of tumour normal surrounding tissue is caused to increase, and in order to which the dosage for receiving the normal tissue around tumour is as low as possible, then
It needs to be arranged multiple secondary collimator (such as dual multi-leaf optical grating and dual diaphragm) or (such as is schemed using longer multi-leaf optical grating
Collimator apparatus 7 in 1a), the former occupies the space of beam optics, to reduce treatment space, the latter makes treatment head
Radius of turn is larger, and multi-leaf optical grating weight is larger, influences the promotion of the kinetic characteristic of blade.On the other hand, as shown in figure 3, greatly
Tumour need coverage field be a, and little tumour need coverage field be b, expansion device in order to allow launched field centre (intensity compared with
High part) it is identical as the dosage rate of two sides, therefore reamed the part of about 50% intermediate high intensity, then small for treating
In the case where tumour, the prior art can be low with dosage rate in the case where using expansion device, reduces the effective dose rate of small launched field.
Utility model content
This application provides a kind of radiotherapy head and radiotherapy unit, can solve the flexibility of radiotherapy head compared with
The problem of difference.The technical solution is as follows:
On the one hand, a kind of radiotherapy head is provided, the radiotherapy head includes: radiographic source and example of primary collimator；
The radiographic source is for issuing radioactivity beam；
Multiple primary collimating channel groups are provided in the example of primary collimator, each primary collimating channel group includes extremely
A few primary collimating channel, the radiographic source can be relatively moved with the example of primary collimator, so that the radiographic source is sent out
Beam out may pass through any primary collimating channel；
Primary collimating channel of the beam that the radiographic source issues by different primary collimating channel groups is on the reference plane
The field area of formation is of different sizes.
Optionally, each primary collimating channel of the beam that the radiographic source issues by same primary collimating channel group is in institute
The launched field characterisitic parameter difference formed in reference planes is stated, the launched field characterisitic parameter includes but is not limited to the dosage rate ginseng of launched field
Number, penumbra parameter.
Optionally, the primary collimating channel group includes at least two primary collimating channels, at least one is described primary quasi-
Expansion device is provided in straight channel, so that the launched field that beam is formed in the reference planes by different primary collimating channels
Characterisitic parameter is different.
Optionally, expansion device is not provided in a primary collimating channel of the primary collimating channel group.
Optionally, the radiotherapy head further includes secondary collimatioa device assembly, and the secondary collimatioa device assembly includes leafy
Collimator MLC, the MLC include the multiple blades that is oppositely arranged and can be movable relatively；
The length p of the blade of the MLC meets:Wherein, h1For the radiographic source with it is described
The distance of blade, h2It is the radiographic source at a distance from the reference planes, d1Pass through for the beam that the radiographic source issues primary
Minimum launched field length of the collimating channel in the reference planes blade direction of motion, d2The beam warp issued for the radiographic source
Primary collimating channel is crossed in the maximum launched field length of the reference planes blade direction of motion.
Optionally, the secondary collimatioa device assembly further include: at least one of the first diaphragm and the second diaphragm, and work as institute
When to state secondary collimatioa device assembly include first diaphragm and second diaphragm, the direction of motion of first diaphragm with it is described
The direction of motion of second diaphragm intersects.
Optionally, the example of primary collimator is rounded, multiple primary collimating channel Circle-Arrays in the example of primary collimator
Column distribution；
The radiographic source and the example of primary collimator can relative rotation so that the beam that the radiographic source issues can be worn
Cross any primary collimating channel.
Optionally, the example of primary collimator is plate-like, multiple primary collimating channel straight lines point in the example of primary collimator
Cloth or array distribution.
Optionally, the maximum that the beam that the radiographic source issues is formed in the reference planes by primary collimating channel
Field area is 40*40 square centimeters, and the beam that the radiographic source issues is by primary collimating channel in the reference planes
The minimum field area of formation is 28*28 square centimeters；
Alternatively, the beam that the radiographic source issues is penetrated by the maximum that primary collimating channel is formed in the reference planes
Wild area is 35*35 square centimeters, and the beam that the radiographic source issues is by primary collimating channel shape in the reference planes
At minimum field area be 22*22 square centimeters.
On the other hand, a kind of radiotherapy unit is provided, the radiotherapy unit includes above-mentioned radiotherapy head.
Technical solution provided by the present application has the benefit that
This application provides a kind of radiotherapy head and radiotherapy units, wherein radiotherapy head include radiographic source and
Example of primary collimator, each primary collimating channel group includes at least one in the multiple primary collimating channel groups being arranged in example of primary collimator
A primary collimating channel, and radiographic source can be relatively moved with example of primary collimator, so that the beam that radiographic source issues may pass through
Any primary collimating channel, primary collimating channel of the beam that radiographic source issues by different primary collimating channel groups is with reference to flat
The field area formed on face is of different sizes.So, radiotherapy head can form different launched fields, radiotherapy head
Flexibility is higher.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 a is a kind of structural schematic diagram for radiotherapy head that the prior art provides；
Fig. 1 b is a kind of structural schematic diagram of radiotherapy head provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of example of primary collimator provided by the embodiment of the utility model；
Fig. 3 is the relational graph of the position of ray in the intensity and launched field of a kind of ray provided by the embodiment of the utility model；
Fig. 4 is a kind of schematic diagram of example of primary collimator provided by the embodiment of the utility model；
Fig. 5 is the structural schematic diagram of another radiotherapy head provided by the embodiment of the utility model；
Fig. 6 is a kind of structural schematic diagram of multi-diaphragm collimator provided by the embodiment of the utility model；
Fig. 7 is a kind of schematic diagram of multi-diaphragm collimator in the prior art；
Fig. 8 is the structural schematic diagram of another multi-diaphragm collimator provided by the embodiment of the utility model；
Fig. 9 is the schematic diagram of a kind of radiographic source and the second launched field provided by the embodiment of the utility model.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application embodiment party
Formula is described in further detail.
In medical technology industry, it will usually be treated using radiotherapy unit to tumour.In radiological unit
Radiotherapy head generally comprises radiographic source and example of primary collimator.Only needed when carrying out radiotherapy by tumor focus region with put
Focus (isocenter point that that is to say radiotherapy unit) position for penetrating treatment head is corresponding, so that the ray that radiographic source issues passes through
Example of primary collimator exposes to tumor focus region after carrying out beam shape, so that it may kill the tumour cell in tumor focus region.Wherein,
The launched field of radiographic source and the dosage rate of focal point are related with the primary collimating channel of example of primary collimator, if example of primary collimator is first
Grade collimating channel is larger, then the launched field formed is larger, and the dosage rate of focal point is lower；If primary primary collimating channel is smaller,
The launched field then formed is smaller, and the dosage rate of focal point is higher.Herein, the launched field of radiographic source can be with are as follows: the ray that radiographic source issues
Maximum illumination range on reference planes (horizontal plane as where the isocenter point of radiotherapy unit).Usually primary collimation
The size of primary collimating channel in device is all the same, can be only formed a kind of launched field, and the flexibility of radiotherapy head is poor.This is practical
New embodiment provides a kind of higher radiotherapy head of flexibility, can form different launched fields.
Fig. 1 b is a kind of structural schematic diagram of radiotherapy head provided by the embodiment of the utility model.As shown in Figure 1 b, should
Radiotherapy head 10 includes radiographic source 101 and example of primary collimator 102a, and for the radiographic source 101 for issuing radioactivity beam, this is first
Multiple primary collimating channel groups (not marking in Fig. 1 b) are provided in grade collimator, each primary collimating channel group includes at least one
A primary collimating channel, such as primary collimating channel K1 may belong to different primary collimating channel groups from primary collimating channel K2.
Radiographic source 101 can be relatively moved with example of primary collimator 102a, so that the beam that radiographic source 101 issues may pass through any primary
Collimating channel；Primary collimating channel of the beam that radiographic source 101 issues by different primary collimating channel groups is on reference planes M
The field area of formation is of different sizes.
It should be noted that radiographic source can be accelerator so that the beam issued is X-ray beam, ray in the application
The beam that source is also possible to isotope radioactive source (such as cobalt -60) sending is gamma ray beam, can also be neutron or proton radiation source,
The application without limitation, is only illustrated radiographic source so that radiographic source is accelerator as an example.Radiographic source 101 and example of primary collimator
102a can be relatively moved, and can be the fixed example of primary collimator movement of radiographic source, be can be the fixed radiographic source of example of primary collimator and moved
It is dynamic, it can also be that radiographic source and example of primary collimator can move, and its relative movement mode can be relative translation or opposite
Rotation etc., the mode that the application relatively moves it is without limitation.
The beam that radiographic source 101 issues can pass through the primary collimating channel of different primary collimating channel groups in reference planes
Area launched field of different sizes is formed on M.Exemplary, example of primary collimator 102a can be the plate structure of shading, primary collimation
The extending direction (direction y in such as Fig. 1 b) in channel can be each perpendicular to the plate structure, radiographic source 101 and example of primary collimator
102a can be relatively moved on the direction (direction x in such as Fig. 1 b) for being parallel to plate structure, so that 101 face of radiographic source
Any primary collimating channel, the beam that radiographic source issues can pass through the primary collimating channel of its face.Primary collimating channel K1
It may belong to different primary collimating channel groups from primary collimating channel K2, it is assumed that the beam that radiographic source 101 issues is by primary
The launched field formed on reference planes M when collimating channel K1 is the first launched field A, and the beam that radiographic source 101 issues is by primary quasi-
The launched field formed on reference planes M when straight channel K2 is the second launched field (such situation is not shown in Fig. 1 b), first in the application
The size of launched field is different from the size of the second launched field.It is separate that reference planes M can be located at example of primary collimator 102a
The side of radiographic source 101, and the direction x being parallel in Fig. 1 b.
It should be noted that the example of primary collimator in radiotherapy head can carry out beam shape to the ray that radiographic source issues,
So that the ray only passes through from the primary collimating channel with radiographic source face, and can not be logical except primary collimation from plate structure
Other regions outside road penetrate, and then form required launched field on the reference plane.It is illustrated only in example of primary collimator in Fig. 1 b
There are two primary collimating channel groups for setting, and each primary collimating channel group only includes the case where a primary collimating channel,
The shape of launched field A shown in Fig. 1 b is circle, and the shape of primary collimating channel can be round table-like at this time；It, should in practical application
The number of primary collimating channel group can be three or four or more, the primary collimating channel that each primary collimating channel group includes
Number may be the shape of two perhaps three or more launched fields may be square or rectangle, just at this time
The shape of grade collimating channel can be quadrangular frustum pyramid shaped, and the utility model embodiment does not limit this.It should be noted that this Shen
Please in reference planes M can be the virtual plane of setting, the application to its specific location without limitation, reference planes in practice
Plane when can be treated with patient where tumor center.
In conclusion radiotherapy head provided by the embodiment of the utility model includes radiographic source and example of primary collimator, primary
Each primary collimating channel group includes at least one primary collimating channel in the multiple primary collimating channel groups being arranged in collimator,
And radiographic source can be relatively moved with example of primary collimator, be led to so that the beam that radiographic source issues may pass through any primary collimation
Road, the launched field that primary collimating channel of the beam that radiographic source issues by different primary collimating channel groups is formed on the reference plane
Size is different.So, radiographic source or mobile example of primary collimator can be moved, makes radiographic source when treating big tumour
The beam of sending passes through the corresponding primary collimating channel of larger field area, and penetrating for radiographic source sending is made when treating little tumour
Beam passes through the corresponding primary collimating channel of smaller field area, so as to improve focus dosage rate when little tumour treatment, and
It reduces for the extra beam except oncotherapy, i.e. radiotherapy head can form different launched fields, the spirit of radiotherapy head
Activity is higher.
It should be noted that in the application following embodiment, (the existing detector by taking field area is square as an example
Plate is generally square), but it is understood that, launched field shape is not limited to square, can be round or ellipse
Etc. any shapes, the application be only illustrated by taking diagram as an example.
In a kind of embodiment provided by the present application, the beam that radiographic source issues is by each of same primary collimating channel group
The launched field characterisitic parameter that primary collimating channel is formed on the reference plane is different, which includes but is not limited to launched field
Dosage rate parameter, penumbra parameter.In a kind of exemplary embodiment, the primary collimating channel group of example of primary collimator be can wrap
At least two primary collimating channels are included, can be set at least one of every group of primary collimating channel primary collimating channel
Whole device (English: flatting filter；Referred to as: FF).In another exemplary embodiment, primary collimating channel group can
To include multiple primary collimating channels, it can also be and be respectively arranged with expansion in two or more primary collimating channels
Device, and the shape of each expansion device can be different, so that being carried out not by the beam of different primary collimating channels by each expansion device
With the expansion of degree, so that the launched field characterisitic parameter formed on the reference plane is different.It is exemplary, in another embodiment party
In formula, has in a primary collimating channel in primary collimating channel group and be not provided with expansion device, that is to say that the primary collimating channel is
Without expansion device (English: flatting filter-free；Referred to as: FFF) mode.
It should be noted that expansion device can to radiographic source issue ray intensity and the transmitted intensity sky
Between be distributed and be adjusted so that through the uniform intensity distribution of the ray after expansion device.It is primary for identical two quasi-
For straight channel, if being provided with expansion device in one of primary collimating channel, it is not provided in another primary collimating channel
Expansion device, then the beam that radiographic source issues, which passes through in the launched field that another primary collimating channel is formed on the reference plane, to be had
The dosage rate that effect utilizes is higher, and can have in the launched field that the beam is formed on the reference plane by this primary collimating channel
It is lower to imitate the dosage rate utilized.
In the application, different expansion devices can be set in different collimating channel groups.It is exemplary, it can be primary quasi-
The small launched field expansion device (English: small flatting filter of customization is set in straight channel；Referred to as: SFF), so that penetrating
It is higher that the beam that line source issues by the primary collimating channel forms dosage rate on the reference plane, and the lesser launched field of area.
And as described in background technique, the part high-intensitive relative to the existing centre for having reamed about 50% using big launched field, this
Application is used for the treatment of little tumour using smaller launched field, in the case where equally using expansion device, but only needs to ream 20-30%'s
Intermediate high intensity part may make entire launched field intensity concordant, to improve dosage rate when little tumour treatment.
Expansion device is arranged in primary collimating channel in the utility model embodiment, so that the structure of radiotherapy head is more
Step up to gather, the accommodation space of patient is larger when reducing the volume of radiotherapy head, and then can to treat patient.
Exemplary, the accommodation space of patient can be cylindrical in the utility model embodiment, and when treating to patient, patient can
To lie in generally rectangular therapeutic bed, the length direction of the therapeutic bed can be the short transverse of the cylinder, the cylinder
Bottom surface diameter can be greater than 1 meter.In the prior art, expansion device is arranged except primary collimating channel sends out radiographic source
Ray out can scatter when passing through expansion device, need to place shielding construction around expansion device.And this is practical new
In type embodiment, even if ray can scatter when passing through expansion device, the ray of scattering also can be by plate structure institute
It absorbs, so that having no ray projects preset launched field, and without installing additional shielding construction, alleviates the weight of radiotherapy head
Amount.
Optionally, Fig. 2 shows a kind of structural schematic diagrams of example of primary collimator, example of primary collimator 102a's in Figure 1b
On the basis of, example of primary collimator 102a includes primary collimating channel group T1 and primary collimating channel group T2, and primary collimating channel group
T1 includes primary collimating channel K1 and primary collimating channel K3, and primary collimating channel group T2 includes primary collimating channel K2 and primary
Collimating channel K4.It is provided with expansion device 103 in primary collimating channel K1 and primary collimating channel K2, primary collimating channel K3 and just
Expansion device is not provided in grade collimating channel K4.The beam that radiographic source 101 issues is each first by same primary collimating channel group
Each field area size that grade collimating channel is formed on reference planes M can be identical, but launched field characterisitic parameter is different.
Fig. 3 shows the relational graph in the intensity and launched field of a kind of ray between the position of ray.It is assumed that radiographic source issues
Beam pass through primary collimating channel shape be it is round table-like, the launched field formed on the reference plane is rounded, then in Fig. 3
Abscissa is the position diametrically of launched field, and position O indicates the center location of launched field, and ordinate is in launched field at a certain position
The intensity of ray (unit is that gray(Gy) is per minute, can also be expressed as Gy/Min).If the bottom surface of primary collimating channel is (separate to penetrate
The one side of line source) it is larger, then the area for the launched field that the radiographic source face primary collimating channel is formed on the reference plane is larger (such as
Only cover the launched field of all positions in a), the intensity of unit area inner rays is lower in launched field, the agent that can effectively use in launched field
Dose rate (intensity that is to say the ray of unit area in launched field) is smaller；If the bottom surface of primary collimating channel is smaller, ray
The area for the launched field that the face primary collimating channel in source is formed on the reference plane is smaller, and (all positions penetrates in such as only covering b
It is wild), the intensity of unit area inner rays is higher in launched field, and the dosage rate that can effectively use in launched field is higher.
It is assumed that the beam that radiographic source 101 shown in Fig. 2 issues was formed on the reference plane by primary collimating channel K1
Launched field is the first launched field, and the beam that radiographic source 101 issues is by the launched field that primary collimating channel K2 is formed on the reference plane
Second launched field, the beam that radiographic source 101 issues are penetrated by the launched field that primary collimating channel K3 is formed on the reference plane for third
Open country, the beam that radiographic source 101 issues is the 4th launched field by the launched field that primary collimating channel K4 is formed on the reference plane, primary
The bottom area of collimating channel K2 is greater than the bottom area of primary collimating channel K1, the bottom area of primary collimating channel K1 and just
The bottom area of grade collimating channel K3 is identical, the bottom area of the bottom area of primary collimating channel K4 and primary collimating channel K2
It is identical.Then the area of the second launched field can be greater than the area of the first launched field, and the area of the first launched field can be equal to third launched field
Area, the area of the second launched field can be equal to the area of the 4th launched field.Exemplary, the area of the first launched field and third launched field is equal
It can be 28*28 square centimeter, that is to say that the first launched field and third launched field can be 28 centimetres of square in side length, second
The area of launched field and the 4th launched field all can be 40*40 square centimeters, that is to say that the second launched field and the 4th launched field can be in side
A length of 40 centimetres of square.The dosage rate of third launched field can be greater than the dosage rate of the first launched field, the dosage rate of the 4th launched field
The dosage rate of the second launched field can be greater than.Optionally, the area of the first launched field and third launched field all can be 22*22 squares li
Rice, that is to say the square that the first launched field and third launched field can be 22 centimetres in side length, the second launched field and the 4th launched field
Area all can be 35*35 square centimeters, that is to say the pros that the second launched field and the 4th launched field can be 35 centimetres in side length
Shape.
It is assumed that the ray that radiographic source issues is the X-ray that energy is 6 megavolts, if desired to the mammary gland of patient or prostate
The tumor focus of equal positions is treated, then needs to be formed biggish launched field on the reference plane, can make radiographic source at this time
The beam of sending is by primary collimating channel K2 or primary collimating channel K4；If desired to the neoplastic disease of the brain localization of patient
Stove is treated, or needs to carry out body portion stereotactic radiotherapy (English: stereotactic body radiation
therapy；Referred to as: SBRT), then it needs to form the dosage rate that can effectively use in lesser launched field and launched field on the reference plane
It is higher, radiographic source can be made by primary collimating channel K1 or primary collimating channel K3 at this time.
It should be noted that since the beam that radiographic source issues is logical by the primary collimation in a primary collimating channel group
The field area that road is formed is different from the beam and penetrates by what the primary collimating channel in another primary collimating channel group was formed
Wild area, so radiotherapy head provided by the embodiment of the utility model can form multiple and different penetrate on the reference plane
Open country, even if requirement of the focal area of different patients to field area size with field size dosage rate is different, the utility model is implemented
The radiotherapy head that example provides is also applicable, without changing other radiotherapy heads.And multiple launched field may include dosage
Rate is smaller and the biggish big launched field of area and dosage rate is larger and the lesser small launched field of area.
Optionally, Fig. 4 shows the schematic diagram of another example of primary collimator.Example of primary collimator 102a can be rounded,
Multiple primary collimating channels in example of primary collimator can be distributed with circumference array, that is to say that multiple primary collimating channel K can be with
The center of circle around plate structure 102a is successively arranged, and each primary collimating channel K is equal at a distance from the center of circle.Radiographic source with
The example of primary collimator can relative rotation so that the beam that radiographic source issues can pass through any primary collimating channel.It is needing
When changing the primary collimating channel that radiographic source sending beam passes through, it is only necessary to control example of primary collimator and be rotated centainly around its center of circle
Angle.Optionally, example of primary collimator 102a can also be plate-like, is such as in be generally shaped like rectangular strip.
Multiple primary collimating channels in example of primary collimator can in example of primary collimator lineal layout or array distribution,
Be multiple primary collimating channel can successively arrange along the length direction of example of primary collimator 102a (Fig. 2 shows i.e. thus
Kind situation), in the primary collimating channel that the beam for needing to change radiographic source sending passes through, it is only necessary to control the example of primary collimator edge
Its length direction moves a certain distance；Alternatively, multiple primary collimating channel can be divided into multirow, and every row primary collimation is logical
Road is successively arranged along the length direction of example of primary collimator, logical in the primary collimation that the beam for needing to change radiographic source sending passes through
When road, it is only necessary to control example of primary collimator and move a certain distance along its length, then along its width direction move it is certain away from
From.
In conclusion radiotherapy head provided by the embodiment of the utility model includes radiographic source and example of primary collimator, primary
Each primary collimating channel group includes at least one primary collimating channel in the multiple primary collimating channel groups being arranged in collimator,
And radiographic source can be relatively moved with example of primary collimator, be led to so that the beam that radiographic source issues may pass through any primary collimation
Road, the launched field that primary collimating channel of the beam that radiographic source issues by different primary collimating channel groups is formed on the reference plane
Size is different.So, radiotherapy head can form different launched fields, and the flexibility of radiotherapy head is higher.
Fig. 5 is the structural schematic diagram of another radiotherapy head provided by the embodiment of the utility model.As shown in figure 5,
On the basis of Fig. 1 b, radiotherapy head can also include secondary collimatioa component (not marking in Fig. 5), which can be with
Including multi-diaphragm collimator (English: Multi-leafCollimator；Referred to as: MLC) 104.
Exemplary, radiotherapy head further includes at least one of the first diaphragm 105 and second diaphragm, and Fig. 5 is illustrated only
The secondary collimatioa component includes the case where the first diaphragm 105.Optionally, when secondary collimatioa component includes the first diaphragm and the simultaneously
When two diaphragms, beam direction (y direction in such as Fig. 5) of first diaphragm with second diaphragm along radioactive source is successively arranged, and
The direction of motion of first diaphragm intersects with the direction of motion of the second diaphragm.Exemplary, the first diaphragm and the second diaphragm can be
Positioned at the side of the close radioactive source of multi-diaphragm collimator, or it is respectively positioned on side of the multi-diaphragm collimator far from radioactive source, alternatively, one
The side (i.e. upper diaphragm) of a close radioactive source positioned at multi-diaphragm collimator, another is located at multi-diaphragm collimator far from radioactive source
Diaphragm (is descended) in side.Exemplary, the direction of motion of upper diaphragm can be the direction x, and the direction of motion of lower diaphragm is the direction z, the z
Direction is both perpendicular to the direction x and the direction y.The secondary collimatioa component can also include clapboard (being not shown in Fig. 5).
Fig. 6 is a kind of structural schematic diagram of multi-diaphragm collimator provided by the embodiment of the utility model.The multi-diaphragm collimator 104
Including two groups of opposite blade groups in the x direction, every group of blade group includes multiple blade P compact arranged in the z-direction, and the leaf
The thickness range of piece is 2 millimeters~2.5 millimeters, it should be noted that the direction z can be the thickness direction of blade, each blade
It can be rectangle, the direction x can be the length direction of blade, and the direction x is perpendicular to the direction z.Each blade P can drive
Length direction (namely direction x shown in fig. 6) under the control of dynamic screw rod (not shown) along blade moves.Drive screw rod can
Conformal region of different shapes is surrounded to control two groups of blades, the conformal region C as two groups of blades are formed in Fig. 6 is rectangular
Shape.Multiple blade P can stop radiographic source issue Radiolucent, driving screw rod can control two groups of blades surround with
The roughly the same conformal region of lesion shape.
Fig. 7 is a kind of schematic diagram of multi-diaphragm collimator in the prior art, and illustrates only the part-structure of blade.If figure
Q shown in 7 is the lesion of patient's body, then drives screw rod to can control two groups of blades and surround with lesion Q shape substantially
Identical conformal region B.Since in the prior art, the launched field that example of primary collimator is formed is larger, it is therefore desirable to configure biggish more
Leaf collimator.Exemplary, the length of the blade of multi-diaphragm collimator is 20cm (assuming that blade is located in radiographic source and reference planes
Point), then multi-diaphragm collimator can it is conformal go out maximum launched field be 40*40 square centimeter, with guarantee treatment biggish tumour when its
Conformal precision.It is existing on the other hand by the technical restriction of existing screw rod in order to meet shielding and conformal multiple requirements
The vane thickness range of multi-diaphragm collimator is 2.5 millimeters~5 millimeters.I.e. blade is not only long and thick, then the quality of blade is larger, right
Drive the requirement of screw rod higher, and the flexibility of blade movement is lower, it is not easy to improve blade velocity, affect transmitted intensity tune
The effect of system.
Fig. 8 is the structural schematic diagram of another multi-diaphragm collimator provided by the embodiment of the utility model, is in the application
Cooperate small field area, multi-diaphragm collimator is smaller, and the requirement to driving reduces, so that the blade of multi-diaphragm collimator
It is shorter and thinner.Exemplary, the thickness range of blade is 2 millimeters~2.5 millimeters in the application.If Q is patient's body in Fig. 8
Lesion, and the lesion is identical as the lesion in Fig. 7, then drive screw rod can control two groups of blades surround it is conformal as shown in Figure 8
Region (does not mark) in Fig. 8.The beam that radiographic source issues can irradiate the lesion of patient through the conformal region, and then kill and suffer from
The tumour cell of person's lesion, and the other positions of patient of the less irradiation in addition to lesion.Comparison diagram 7 and Fig. 8 are it is found that this reality
The multi-diaphragm collimator provided with new embodiment, since blade is thinner, the area in the conformal region that blade surrounds and the face of lesion
Product difference is smaller, and shape is more closely, conformal precision is higher, and then what the ray that issues of radiographic source can be less is irradiated to trouble
The precision of other health tissues in person's body in addition to lesion, the radiation exposure lesion that radiographic source issues is higher.
In radiotherapy head provided by the present application, the length p of blade meets:Wherein, h1For
Radiographic source is at a distance from blade, h2It is radiographic source at a distance from reference planes, d1It is collimated for the beam that radiographic source issues by primary
The minimum launched field length of the channel blade direction of motion (namely Fig. 6 or direction x shown in Fig. 9) on the reference plane, d2For ray
Maximum launched field length of the beam that source issues by the primary collimating channel blade direction of motion on the reference plane.Radiographic source and ginseng
Examine the distance h of plane2It is referred to as Source Axis Distance (English: Source toAxis Distance；Referred to as: SAD).
It is exemplary, it is assumed that it be the minimum launched field that is formed on the reference plane of beam in side length is 28 centimetres that radiographic source, which issues,
Square, and the side length of the square is the launched field length of the reference planes blade direction of motion, radiographic source is on the reference plane
The square that the maximum launched field of formation is 40 centimetres in side length, and the side length of the square is the reference planes blade direction of motion
Launched field length, that is to say, above-mentioned d1=28 centimetres, d2=40 centimetres.Referring to FIG. 9, radiographic source 101 and reference planes away from
It is 100 centimetres from h2, radiographic source is 40 centimetres with multi-diaphragm collimator blade distance h1, then the length p of blade meets It that is to say 5.6≤p < 16.For example, with leafy standard in Fig. 9
One group of blade in straight device is for the projection under the ray that radiographic source issues needs to be completely covered the minimum launched field, at this point, more
The length of blade of leaf collimatorCentimetre.
The length of blade of multi-diaphragm collimator can be 11.2 centimetres in the application, when it combines primary collimating channel group to be formed
The area of minimum launched field is 28*28 square centimeters, and when the blade of multi-diaphragm collimator is located at its extreme position, it can be formed
Maximum launched field area be 40*40 square centimeters, with the treatment for larger tumour.Due to the multi-diaphragm collimator leaf of the application
Piece is shorter, and quality is smaller, therefore thinner screw rod driving can be used, thus relative to shown in Fig. 7 in the prior art more
Leaf collimators vanes can be thinner, to can be adapted for the primary collimating channel of smaller aperture due when treating little tumour to match
The movement of hing straps to reduce the reception dosage of normal surrounding tissue, while being conducive to improve blade velocity and optimizing dosage
The modulation of intensity, improves the therapeutic effect of little tumour, and simultaneously can be used for the treatment of larger tumour.
In addition, the length p of the blade of multi-diaphragm collimator may beThereforeIt that is to say 5.6≤p≤8.If two groups of blades in multi-diaphragm collimator are penetrated what radiographic source issued
The minimum launched field is completely covered in projection under line, then the length of the blade P of multi-diaphragm collimator can be 5.6 centimetres at this time.
It should be noted that if the shape of primary collimating channel be it is round table-like, radiographic source is formed most on the reference plane
Big launched field is square, and the side length of the square is 40 centimetres, then the ray for needing radiographic source to issue is merely through primary quasi-
The round range of exposures that diameter is 50 centimetres can be formed after straight channel.In the prior art, if it is 40 centimetres that launched field, which is in side length,
Square, and the conformal region for needing the blade of multi-diaphragm collimator to surround can cover any position in launched field, then leafy standard
The length of the blade of straight device needsCentimetre, and in the utility model embodiment the length of blade only need for
11.2 centimetres；If the conformal region for only needing the blade of multi-diaphragm collimator to surround is located at the middle position of launched field, leafy collimation
The length of the blade of device needsCentimetre, and the length of blade only needs to be 5.6 lis in the utility model embodiment
Rice.Therefore, the smaller lighter weight of length of blade in the utility model embodiment in multi-diaphragm collimator, the weight of multi-diaphragm collimator
It is smaller.In addition, since the weight of each blade for driving screw rod to need to drive is smaller, so what driving screw rod was moved with movable vane piece
Speed can be higher, and then can form conformal region faster, improves therapeutic efficiency.
What needs to be explained here is that the above merely illustrative explanation of length of blade, during actual use, to the length of blade
Meet under conditions above, with no restrictions to its specific value.Such as when 5.6≤p < 16, the value of p can be 7,8,10,14
Deng.
Optionally, the first diaphragm and the second diaphragm may each comprise two pieces of opposite tungsten blocks, and two pieces of tungsten blocks can move
It is dynamic.If secondary collimatioa component only includes the first diaphragm and multi-diaphragm collimator, and the moving direction of the blade of multi-diaphragm collimator is the side x
To then the moving direction of the two of the first diaphragm piece tungsten block can be the direction z, and the first diaphragm is for stopping ray not cover from blade
Region in other regions in addition to conformal region be transmitted through launched field.In addition, secondary collimatioa component only include the first diaphragm with
When multi-diaphragm collimator, multi-diaphragm collimator can be located at side of first diaphragm far from radiographic source；Only include in secondary collimatioa component
When the second diaphragm and multi-diaphragm collimator, multi-diaphragm collimator can be located at the second diaphragm close to the side of radiographic source；In secondary collimatioa
When component includes the first diaphragm, the second diaphragm and multi-diaphragm collimator simultaneously, the first diaphragm, the second diaphragm and multi-diaphragm collimator can be with
Direction along example of primary collimator far from radiographic source is successively arranged, and the tungsten of the direction of motion of the tungsten block of the first diaphragm and the second diaphragm
The block direction of motion is vertical, and the second diaphragm can be used for the ray for stopping to penetrate from the gap between adjacent blades at this time.
In conclusion radiotherapy head provided by the embodiment of the utility model includes radiographic source and example of primary collimator, primary
Each primary collimating channel group includes at least one primary collimating channel in the multiple primary collimating channel groups being arranged in collimator,
And radiographic source can be relatively moved with example of primary collimator, be led to so that the beam that radiographic source issues may pass through any primary collimation
Road, the launched field that primary collimating channel of the beam that radiographic source issues by different primary collimating channel groups is formed on the reference plane
Size is different.So, radiotherapy head can form different launched fields, and the flexibility of radiotherapy head is higher.
The utility model embodiment additionally provides a kind of radiotherapy unit, the radiotherapy unit may include Fig. 1 b or
Radiotherapy head shown in fig. 5.Optionally, radiotherapy unit further include: annular framework or C-arm rack, radiation are controlled
Treating head can be set on the annular framework or the C-arm rack.
Exemplary, which can be medical accelerator, radiotherapy head can be set in annular framework or
On support horn in person's C-arm rack, when being treated using lesion of the radiotherapy unit to patient's body, need
The lesion is placed in the position of the isocenter point of radiotherapy unit, and controls support horn and drives radiotherapy head in the grade
Heart point is that the center of circle is rotated, and then is treated to the lesion.Due to the radiotherapy unit in the utility model embodiment
In radiotherapy head lighter in weight, therefore the support horn can be relatively easy to drive the radiotherapy head to rotate, and
It can be more accurately corresponding with the lesion of patient's body by the isocenter point of radiotherapy unit.
The foregoing is merely the alternative embodiments of the application, not to limit the application, it is all in spirit herein and
Within principle, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this application.
Claims (10)
1. a kind of radiotherapy head, which is characterized in that the radiotherapy head includes: radiographic source and example of primary collimator；
The radiographic source is for issuing radioactivity beam；
Multiple primary collimating channel groups are provided in the example of primary collimator, each primary collimating channel group includes at least one
A primary collimating channel, the radiographic source can be relatively moved with the example of primary collimator, so that the radiographic source issued
Beam may pass through any primary collimating channel；
Primary collimating channel of the beam that the radiographic source issues by different primary collimating channel groups is formed on the reference plane
Field area it is of different sizes.
2. radiotherapy head according to claim 1, which is characterized in that the beam that the radiographic source issues is by same first
The launched field characterisitic parameter that each primary collimating channel of grade collimating channel group is formed in the reference planes is different, and the launched field is special
Property parameter includes but is not limited to the dosage rate parameter of launched field, penumbra parameter.
3. radiotherapy head according to claim 2, which is characterized in that the primary collimating channel group includes at least two
Primary collimating channel is provided with expansion device at least one described primary collimating channel, so that beam is by different primary quasi-
The launched field characterisitic parameter that straight channel is formed in the reference planes is different.
4. radiotherapy head according to claim 2, which is characterized in that one of the primary collimating channel group is primary quasi-
Expansion device is not provided in straight channel.
5. radiotherapy head according to claim 1, which is characterized in that the radiotherapy head further includes secondary collimator
Component, the secondary collimatioa device assembly include multi-diaphragm collimator MLC, and the MLC includes being oppositely arranged and can be movable relatively more
A blade；
The length p of the blade of the MLC meets:Wherein, h1For the radiographic source and the blade
Distance, h2It is the radiographic source at a distance from the reference planes, d1It is collimated for the beam that the radiographic source issues by primary
Minimum launched field length of the channel in the reference planes blade direction of motion, d2Pass through just for the beam that the radiographic source issues
Maximum launched field length of the grade collimating channel in the reference planes blade direction of motion.
6. radiotherapy head according to claim 5, which is characterized in that the secondary collimatioa device assembly further include: first
At least one of diaphragm and the second diaphragm, and when the secondary collimatioa device assembly includes first diaphragm and second light
When late, the direction of motion of first diaphragm intersects with the direction of motion of second diaphragm.
7. radiotherapy head according to claim 1, which is characterized in that the example of primary collimator is rounded, the primary
Multiple primary collimating channel circumference array distributions in collimator；
The radiographic source and the example of primary collimator can relative rotation appoint so that the beam that the radiographic source issues may pass through
The one primary collimating channel.
8. radiotherapy head according to claim 1, which is characterized in that the example of primary collimator is plate-like, the primary
Multiple primary collimating channel lineal layouts or array distribution in collimator.
9. radiotherapy head according to claim 1, which is characterized in that the beam that the radiographic source issues is by primary quasi-
The maximum field area that straight channel is formed in the reference planes is 40*40 square centimeters, the beam that the radiographic source issues
The minimum field area formed in the reference planes by primary collimating channel is 28*28 square centimeters；
Alternatively, the maximum launched field face that the beam that the radiographic source issues is formed in the reference planes by primary collimating channel
Product is 35*35 square centimeters, and the beam that the radiographic source issues is formed in the reference planes by primary collimating channel
Minimum field area is 22*22 square centimeters.
10. a kind of radiotherapy unit, which is characterized in that the radiotherapy unit includes that claim 1 to 9 is any described
Radiotherapy head.
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| CN201820491716.XU CN208678191U (en) | 2018-04-09 | 2018-04-09 | Radiotherapy head and radiotherapy unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108379748A (en) * | 2018-04-09 | 2018-08-10 | 西安大医数码科技有限公司 | Radiotherapy head and radiotherapy unit |
| CN110732094A (en) * | 2019-11-15 | 2020-01-31 | 山东新华医疗器械股份有限公司 | tumor radiotherapy image guide equipment |
-
2018
- 2018-04-09 CN CN201820491716.XU patent/CN208678191U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108379748A (en) * | 2018-04-09 | 2018-08-10 | 西安大医数码科技有限公司 | Radiotherapy head and radiotherapy unit |
| CN108379748B (en) * | 2018-04-09 | 2019-11-05 | 西安大医集团有限公司 | Radiotherapy head and radiotherapy unit |
| US11975216B2 (en) | 2018-04-09 | 2024-05-07 | Our United Corporation | Radiation treatment head and radiation treatment device |
| CN110732094A (en) * | 2019-11-15 | 2020-01-31 | 山东新华医疗器械股份有限公司 | tumor radiotherapy image guide equipment |
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Address after: 710018 Xi'an Economic and Technological Development Zone, Shaanxi Province, No.66, Fengcheng 12 Road, No.28 Building, International City Business Center, Unit 1, Floor 3, Room 10301 Patentee after: Xi'an Dayi Group Co., Ltd Address before: 710018 Xi'an Economic and Technological Development Zone, Shaanxi Province, No.66, Fengcheng 12 Road, No.28 Building, International City Business Center, Unit 1, Floor 3, Room 10301 Patentee before: Xi'an great medicine group Co., Ltd. |