CN204556844U - Two-way detector array calibration system - Google Patents
Two-way detector array calibration system Download PDFInfo
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- CN204556844U CN204556844U CN201520113807.6U CN201520113807U CN204556844U CN 204556844 U CN204556844 U CN 204556844U CN 201520113807 U CN201520113807 U CN 201520113807U CN 204556844 U CN204556844 U CN 204556844U
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Abstract
The utility model relates to two-way detector array fields of measurement, a kind of two-way detector array calibration system is provided, to solve, large launched field irradiates lower radiation field dosage skewness, dosemeter exists energy response error, thus cause dosemeter to measure inaccurate problem, this system comprises radiation source, die body, detector array, the data processing module that is connected with detector array, and wherein radiation source, die body, detector array set gradually from top to bottom.The technical scheme that the utility model proposes eliminates the uneven error brought of energy response error and large launched field edge.
Description
Technical field
The utility model relates to two-way detector array fields of measurement, particularly a kind of two-way detector array calibration system.
Background technology
At present, most advanced, accurate radiotherapy technology---Intensity Modulation Radiated Therapy (IMRT) technology is widely applied in China in the world, this technology utilizes medical accelerator as parent, mix multi-diaphragm collimator and 3 D positioning equipment, partner treatment plan is implemented to irradiate to tumor focus, avoids the direct irradiation of normal tissue.In order to ensure the life security of patient, really reaching accurate radiotherapy effect, needing to carry out dosage measurement and dosage verifying to medical accelerator and treatment plan.Existing a lot of ripe product both at home and abroad, the such as mapcheck of U.S. sun nuclear, 729 of German PTW, the MD1600 etc. of China Testing Technology Institute of China.But whether the measured value of this series products is reliable and accurately, need the method for a set of advanced person to carry out scale to ensure to it.And this series products belongs to face array measurement, its probe access number is many, area is large, its dosage measurement value particularly absolute dosages measured value must accurately and reliably, this error just needing a kind of scale method to cause to overcome the large measurement unevenness that may cause of area.
At present conventional scale method has three kinds: a kind ofly directly under large launched field (coverage field 300mm × 300mm), irradiate normalizing, and the method is simple to operate, disposablely completes, but due to large launched field radiation field dosage skewness, causes measurement inaccurate; Second method is (coverage field 100mm × 100mm) under standard launched field, carries out independent scale to each detector, and accurately and reliably, but complicated operation, not easily implements this scale method measured value; The third method is under adopting large launched field (coverage field 260mm × 260mm), irradiate under 0 °, 90 °, 180 ° three angles respectively, the error that the unevenness can eliminating launched field is brought, but the method can not eliminate large launched field in the low error brought of edge dose value.
Utility model content
[technical matters that will solve]
The purpose of this utility model is to provide a kind of two-way detector array calibration system, and to solve, large launched field irradiates lower radiation field dosage skewness, dosemeter exists energy response error, thus causes dosemeter to measure inaccurate problem.
[technical scheme]
The utility model is achieved through the following technical solutions.
First the utility model relates to a kind of two-way detector array calibration system, it comprises radiation source, die body, detector array, the data processing module be connected with detector array, described radiation source, die body, detector array sets gradually from top to bottom, distance between described radiation source and detector array is 100cm, the thickness of described die body is 5cm, the length of described die body is greater than the length of detector array, described detector array is divided into first quartile by its horizontal median axis and vertical centering control axis, second quadrant, third quadrant, fourth quadrant is totally four quadrants, the length of described four quadrants is 140mm, width is 140mm, described data processing module comprises the first data storage cell of the measured value for storage detector array current quadrant, for the second data storage cell of the measured value of storage detector array after horizontally rotating 180 ° around current quadrant central point, arithmetic element and the normalization unit for being normalized the output data being averaged arithmetic element is averaged for what ask for the mean value of the first data storage cell data and the second data storage cell data, described first data storage cell is connected with detector array respectively with the second data storage cell, the described input end being averaged arithmetic element is connected with the first data storage cell and the second data storage cell respectively, the input end of described normalization unit is connected with the output terminal being averaged arithmetic element.
As one preferred embodiment, at least large than the length of the detector array 2cm of the length of described die body.
As another preferred embodiment, described system also comprises aluminium sheet and therapeutic bed, and described aluminium sheet is arranged between detector array and die body, and described therapeutic bed is arranged on the below of detector array.
As another preferred embodiment, described radiation source is linear accelerator, and described die body is solid water.
As another preferred embodiment, the length of described detector array is 28cm.
[beneficial effect]
The technical scheme that the utility model proposes has following beneficial effect:
(1) detector of the two-way detector array in the utility model has different calibration factors under different-energy, eliminates the error that energy response brings.
(2) Region dividing of two-way detector array is 4 quadrants by the utility model, and each quadrant is scale respectively, eliminates the uneven error brought of radiation field.
(3) the utility model adopt 300mm × 300mm large irradiation field under middle 140mm × 140mm region as homogeneous radiation field, the uneven error brought in large launched field edge can be eliminated.
(4) two-way detector array in the utility model is measured at 0 ° and 180 ° of both directions respectively, and adopts the mean value of both direction measured value as final measured value, further obviates the uneven error brought of radiation field.
Accompanying drawing explanation
The structural representation of the two-way detector array calibration system that Fig. 1 provides for embodiment one of the present utility model.
The connection diagram of the two-way detector array that Fig. 2 provides for embodiment one of the present utility model and data processing module.
The process flow diagram of the two-way detector array scale method that Fig. 3 provides for embodiment two of the present utility model.
Fig. 4 is that the quadrant of embodiment detector array of the present utility model divides schematic diagram.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, clear, complete description is carried out to embodiment of the present utility model, obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiment, neither to restriction of the present utility model.Based on embodiment of the present utility model, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to protection domain of the present utility model.
The structural representation of the two-way detector array calibration system that Fig. 1 provides for the utility model embodiment one.As shown in Figure 1, this system comprises linear accelerator 1, solid water 2, detector array 3, the data processing module 6 that is connected with detector array 3, linear accelerator 1, solid water 2, detector array 3 set gradually from top to bottom, aluminium sheet 4 is arranged between detector array 3 and solid water 2, therapeutic bed 5 is arranged on the below of detector array 3, distance between linear accelerator 1 and detector array 3 is 100cm, the thickness of solid water 2 is 5cm, the length 2cm larger than the length of detector array 3 of solid water 2.Need to illustrate, the detector array 3 in the utility model is two-way detector array.
As shown in Figure 4, detector array 3 is divided into first quartile, the second quadrant, third quadrant, fourth quadrant totally four quadrants by its horizontal median axis and vertical centering control axis, wherein in these four quadrants each quadrant length is 140mm, width is 140mm.
Data processing module 6 comprises the first data storage cell of the measured value for storage detector array current quadrant, for the second data storage cell of the measured value of storage detector array after horizontally rotating 180 ° around current quadrant central point, arithmetic element and the normalization unit for being normalized the output data being averaged arithmetic element is averaged for what ask for the mean value of the first data storage cell data and the second data storage cell data, particularly, first data storage cell is connected with detector array respectively with the second data storage cell, the input end being averaged arithmetic element is connected with the first data storage cell and the second data storage cell respectively, the input end of normalization unit is connected with the output terminal being averaged arithmetic element.In actual application, integrator can being adopted as being averaged arithmetic element, adopting multiplier as normalization unit.
Adopting the system that provides of embodiment one to carry out the method for two-way detector array scale can with reference to following concrete grammar embodiment.
The process flow diagram of the two-way detector array scale method that Fig. 3 provides for the utility model embodiment two.As shown in Figure 3, the method comprising the steps of S1, to step S6, is described in detail to above-mentioned steps below respectively.
Step S1: initialization two-way detector array system.
Concrete with reference to embodiment one, set gradually linear accelerator, solid water and detector array from top to bottom, wherein the distance of linear accelerator and detector array is 100cm, the thickness of solid water is 5cm, the length of solid water is greater than the length of detector array, detector array is divided into first quartile, the second quadrant, third quadrant, fourth quadrant totally four quadrants by its horizontal median axis and vertical centering control axis, each quadrant wherein in these four quadrants length is 140mm, width is 140mm.Need explanation, in an initial condition, the central point of linear accelerator and detector array is at same vertical direction, the i.e. central point of the launched field center alignment detector array of linear accelerator, when adopting step S2 and step S3 to carry out scale, need the central point launched field center of linear accelerator being aimed at each quadrant, but when carrying out actual measurement, then need the central point of the launched field center alignment detector array of linear accelerator.
Step S2:0 ° of measurement.
Particularly, from four quadrants of detector array, select a quadrant as current quadrant, the launched field center of linear accelerator is aimed at the central point of current quadrant, the bundle condition that goes out of linear accelerator is: coverage field 300mm × 300mm, ray energy 6MV, go out to restraint jumping figure 100MU, detector array carries out measuring and 0 of the current quadrant obtained ° of measurement data is saved to the first data storage cell.
Step S3:180 ° of measurement.
Particularly, by detector array after the central point of current quadrant horizontally rotates 180 °, the launched field center of linear accelerator is aimed at the central point of current quadrant, the bundle condition that goes out of linear accelerator is: coverage field 300mm × 300mm, ray energy 6MV, go out to restraint jumping figure 100MU, detector array carries out measuring and 180 of the current quadrant obtained ° of measurement data is saved to the second data storage cell.Such as, if step S2 selects first quartile as current quadrant, then detector array is horizontally rotated 180 ° around the central point of first quartile, after rotating, the position of first quartile changes, and now needs the position adjusting linear accelerator to make the launched field center of linear accelerator aim at first quartile.
Step S4: the mean value asking for 0 ° of measurement data and 180 ° of measurement data.
Particularly, 0 ° of measurement data of the current quadrant in 0 ° of measurement data of the current quadrant in the first data storage cell and the second data storage cell is averaging, obtains the averaged measurements of current quadrant.Need to illustrate, integrator can be adopted to realize being averaging computing.
Step S5: mean value is normalized and obtains calibration factor, and the energy value recording current linear accelerator institute divergent-ray.
Particularly, the averaged measurements of the current quadrant in step S4 is normalized to current quadrant central point absolute dose value, obtain the calibration factor of current quadrant, wherein current quadrant central point absolute dose value obtains according to national metrological verification regulations measurement, in addition, in this step normalization formula be R
m(x, y)=S/M (x, y), R in formula
mthe calibration factor that (x, y) is M (M=1,2,3,4) quadrant, coordinate is the detector of (x, y), S is the central point absolute dose value of M quadrant, and (x, y) represents the coordinate of the detector in M quadrant.After obtaining the calibration factor of current quadrant, record the energy value of current linear accelerator institute divergent-ray, this energy value is corresponding with the calibration factor of current quadrant.When applying, calibration factor under this energy condition can be called by formula D
m(x, y)=R
m(x, y) × M (x, y) obtains the measured value of detector after scale, D in formula
m(x, y) measured value that to be M (M=1,2,3,4) quadrant internal coordinate be after the scale of the detector of (x, y).Need in addition to illustrate, this step can adopt multiplier to realize normalization computing.
Step S6: repeat step S2 to step S5, until complete the measurement of detector array All Quardrants calibration factor.
Particularly, repeat step S2 to step S5, complete the measurement of the quadrant calibration factor of first quartile, the second quadrant, third quadrant and fourth quadrant, wherein each quadrant calibration factor comprises the calibration factor of all detectors in this quadrant.
As can be seen from the above embodiments, the detector of the two-way detector array in the utility model embodiment has different calibration factors under different-energy, eliminates the error that energy response brings; The Region dividing of two-way detector array is 4 quadrants by the utility model embodiment, and each quadrant is scale respectively, eliminates the uneven error brought of radiation field; The utility model embodiment as homogeneous radiation field, eliminates the uneven error brought in large irradiation field edge in middle 140mm × 140mm region under adopting the large irradiation field of 300mm × 300mm; Two-way detector array in the utility model embodiment is measured at 0 ° and 180 ° of both directions respectively, and adopts the mean value of both direction measured value as final measured value, further obviates the uneven error brought of radiation field.
Claims (5)
1. a two-way detector array calibration system, it is characterized in that comprising radiation source, die body, detector array, the data processing module be connected with detector array, described radiation source, die body, detector array sets gradually from top to bottom, distance between described radiation source and detector array is 100cm, the thickness of described die body is 5cm, the length of described die body is greater than the length of detector array, described detector array is divided into first quartile by its horizontal median axis and vertical centering control axis, second quadrant, third quadrant, fourth quadrant is totally four quadrants, the length of described four quadrants is 140mm, width is 140mm, described data processing module comprises the first data storage cell of the measured value for storage detector array current quadrant, for the second data storage cell of the measured value of storage detector array after horizontally rotating 180 ° around current quadrant central point, arithmetic element and the normalization unit for being normalized the output data being averaged arithmetic element is averaged for what ask for the mean value of the first data storage cell data and the second data storage cell data, described first data storage cell is connected with detector array respectively with the second data storage cell, the described input end being averaged arithmetic element is connected with the first data storage cell and the second data storage cell respectively, the input end of described normalization unit is connected with the output terminal being averaged arithmetic element.
2. two-way detector array calibration system according to claim 1, is characterized in that at least large than the length of the detector array 2cm of the length of described die body.
3. two-way detector array calibration system according to claim 1, characterized by further comprising aluminium sheet and therapeutic bed, and described aluminium sheet is arranged between detector array and die body, and described therapeutic bed is arranged on the below of detector array.
4., according to described two-way detector array calibration system arbitrary in claims 1 to 3, it is characterized in that described radiation source is linear accelerator, described die body is solid water.
5. two-way detector array calibration system according to claim 1, is characterized in that the length of described detector array is 28cm.
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| CN201520113807.6U CN204556844U (en) | 2015-02-17 | 2015-02-17 | Two-way detector array calibration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614758A (en) * | 2015-02-17 | 2015-05-13 | 四川中测辐射科技有限公司 | Calibration method and system for two-dimensional detector array |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614758A (en) * | 2015-02-17 | 2015-05-13 | 四川中测辐射科技有限公司 | Calibration method and system for two-dimensional detector array |
| CN104614758B (en) * | 2015-02-17 | 2017-03-29 | 四川中测辐射科技有限公司 | Two-way detector array scale method and system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150812 Effective date of abandoning: 20170329 |
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| AV01 | Patent right actively abandoned |