CN104799878B - A kind of method and apparatus of rack speed of rotation when setting cardiac CT scan - Google Patents
A kind of method and apparatus of rack speed of rotation when setting cardiac CT scan Download PDFInfo
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- CN104799878B CN104799878B CN201410033775.9A CN201410033775A CN104799878B CN 104799878 B CN104799878 B CN 104799878B CN 201410033775 A CN201410033775 A CN 201410033775A CN 104799878 B CN104799878 B CN 104799878B
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Abstract
The present invention relates to a kind of method and apparatus of rack speed of rotation when setting cardiac CT scan.This method comprises: according to the value upper limit for determining sampling time window length the cardiac cycle of heart；Average rotation rate of the rack within a cardiac cycle is chosen according to the value upper limit and cardiac cycle；And the rotation parameter of setting rack, so that rack, in the rotary course in a cardiac cycle, average rotation rate is greater than the average rotation rate within a cardiac cycle when in sampling time window.
Description
Technical field
The present invention relates to racks when cardiac CT scan technical field more particularly to a kind of setting cardiac CT scan to rotate speed
The method and apparatus of rate.
Background technique
When the prior art is scanned heart with CT machine, more sector scannings are common raising sweep time resolution ratio
Method.That is: in each sampling time window, only to the data of a part of angle (sector) position in a section of heart
It is acquired, is then integrated together the scan data in obtained multiple sector positions, formed complete one week or rebuild
The heart scanning image of necessary angle (the usually fan angle that 180 degree adds the corresponding fan-shaped x-ray beam of detector).
During existing more sector scannings, the speed of rotation of the rack (Gantry) of CT machine be it is constant, therefore, accordingly
Parameter setting need to meet the requirements of following two formula:
KR=pT ± τ
R=n τ
Wherein, k, p, n are the integer not less than 1, and n indicates the number of sector, and p is indicated between two neighboring sector scanning
Cardiac cycle number, k indicates rack (Gantry) number of revolutions of the CT machine between adjacent sector scanning twice, and T indicates aroused in interest
Period, τ indicate the length of a sampling time window, and R indicates that the rack of CT machine revolves the Mean Speed to turn around, and R can use machine
Frame rotation turns around the required time to indicate.
However, rack (Gantry) speed of rotation of CT machine can only when the method stated in use carries out CT heart scanning
Before starting rotation, chosen in CT machine in advance prepared limited several speed of rotation values, during heart scanning
It cannot change.This selection that will lead to τ and n is difficult to fully meet the requirement of above-mentioned formula.Thus, it has to increase heart and sweep
The number of sectors retouched also increases the total time of heart scanning.
Even if gantry rotation rate can arbitrarily be set to meet above-mentioned formula, but tend not to make full use of machine at this time
The maximum rotative speed of frame, and then lead to scan that sector number is excessive, and data recombination is difficult when reconstruction, complete heart scanning it is total when
Between it is too long, patient cause because feeling suffocated for a long time the rhythm of the heart fluctuation increase, eventually lead to scanning failure.
In addition, cardiac cycle may change during heart scanning, this will lead to time window with respect to the heart
The position in dynamic period changes, so that scanning failure.
It is therefore desirable to which a kind of method and apparatus of rack speed of rotation when providing setting cardiac CT scan, are swept with reducing
Sector number is retouched, total sweep time is reduced, improves the success rate of heart scanning.
Summary of the invention
An embodiment provides a kind of method of rack speed of rotation when setting cardiac CT scan, packets
It includes: according to the value upper limit for determining sampling time window length the cardiac cycle of heart；It is selected according to the value upper limit and cardiac cycle
Take average rotation rate of the rack within a cardiac cycle；And the rotation parameter of setting rack, so that rack is one
In rotary course in a cardiac cycle, average rotation rate was greater than within a cardiac cycle when in sampling time window
Average rotation rate.
Another embodiment of the present invention provide it is a kind of setting cardiac CT scan when the rack speed of rotation device, packet
It includes: time window upper limit determining module, for determining the value upper limit of sampling time window length the cardiac cycle according to heart；
Mean Speed chooses module, for the average rotation according to the value upper limit and cardiac cycle selection rack within a cardiac cycle
Rate；And rotation parameter setting module, for setting the rotation parameter of rack, so that rotation of the rack within a cardiac cycle
During turning, average rotation rate is greater than the average rotation rate within a cardiac cycle when in sampling time window.
Detailed description of the invention
The embodiment of the present invention is described in conjunction with the accompanying drawings, the present invention may be better understood, in the accompanying drawings:
The stream of one embodiment of the method for rack speed of rotation when Fig. 1 show setting cardiac CT scan of the invention
Journey schematic diagram；
Rotation parameter in the method for rack speed of rotation when Fig. 2 show setting cardiac CT scan of the invention is set
One embodiment flow diagram；
Another embodiment of the method for rack speed of rotation when Fig. 3 show setting cardiac CT scan of the invention
Flow diagram；
Another embodiment of the method for rack speed of rotation when Fig. 4 show setting cardiac CT scan of the invention
Flow diagram；
One embodiment of the device of rack speed of rotation when Fig. 5 show setting cardiac CT scan of the invention is shown
Meaning property block diagram.
Specific embodiment
A specific embodiment of the invention explained below, it should be pointed out that in the specific descriptions of these embodiments
In the process, in order to carry out brief and concise description, this specification can not all features to actual embodiment make in detail
Most description.It is to be understood that during the actual implementation of any one embodiment, as in any one work
During journey project or design object, in order to realize the objectives of developer, in order to meet, system is relevant or quotient
The relevant limitation of industry can usually make various specific decisions, and this can also be implemented from a kind of embodiment to another kind
It changes between mode.Moreover, it is to be understood that although the effort gone out done in this development process may be complicated
And it is interminable, however for those skilled in the art relevant to present disclosure, in the disclosure
The some designs carried out on the basis of the technology contents of exposure, the changes such as manufacture or production are conventional technology, no
It should be understood as that content of this disclosure is insufficient.
Unless otherwise defined, technical term or scientific term used in claims and specification should be this hair
The ordinary meaning that personage in bright technical field with general technical ability is understood.Present patent application specification and power
" first ", " second " used in sharp claim and similar word are not offered as any sequence, quantity or importance, and
It is used only to distinguish different component parts.The similar word such as " one " or " one " is not offered as quantity limitation, but indicates
There are at least one." including " either " includes " etc. that similar word means to appear in the element before " including " or " including "
Either object covers the element for appearing in " including " either and " include " presented hereinafter or object and its equivalent element, it is not excluded that
Other elements or object." connection " either the similar word such as " connected " is not limited to physics or mechanical connection,
It is also not necessarily limited to direct or indirect connection.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
The one of the method 100 of rack speed of rotation when showing setting cardiac CT scan of the invention with reference to Fig. 1, Fig. 1
The flow diagram of a embodiment.This method 100 includes step 101 to 103.
As shown in Figure 1, in a step 101, in the value that sampling time window length is determined according to the cardiac cycle of heart
Limit.
In one embodiment of the invention, special electrocardio monitoring device can be used, such as: using ECG monitor (ECG
Monitor) electrocardiosignal is obtained, and using the cardiac cycle of electrocardiosignal as the predicted value of cardiac cycle when acquisition.Such as:
For angiocardiography, optimal sampling time window (Sampling Time Window) be cardiac cycle in from 60% to
70% period, i.e. the value upper limit of the length τ of sampling time window are no more than the 10% of cardiac cycle.It is rotated in rack
The value range of τ can be determined as some percentage no more than cardiac cycle under speed is lower or the higher situation of heart rate, than
Such as: 30%, in some cases, any one value less than 40% can also be taken.Such as: when cardiac cycle is 0.86 second,
The 30% of cardiac cycle is about 0.25 second, and the 40% of cardiac cycle about 0.35 second, then the value upper limit of τ can be determined as not surpassing
0.25 second is spent, or is no more than 0.3 second.
In a step 102, the average rotation according to the value upper limit and cardiac cycle selection rack within a cardiac cycle
Rate.
In one embodiment of the invention, rack can be chosen by following formula (1) within a cardiac cycle
Average rotation rate.
k·Rw=pT ± τ (1)
Wherein, k, p are the integer not less than 1, and p indicates the cardiac cycle number between two neighboring sector scanning, and k is indicated
The rack rotating cycle of CT machine between adjacent sector scanning twice, T indicate cardiac cycle, and τ indicates a sampling time window
Length, RwIt indicates average rotation rate of the rack of CT machine within a cardiac cycle, the institute that turns around can be revolved with rack
The time needed indicates.In one embodiment of the invention, the value of k, p can be equal to 1.
In one embodiment of the invention, in a step 102, the value upper limit application that can will be determined in step 101
In formula (1), a preliminary average rotation rate R is determinedw。
In step 103, the rotation parameter of rack is set, so that rack is in the rotary course in a cardiac cycle,
Average rotation rate is greater than the average rotation rate within a cardiac cycle when it is in sampling time window.
In one embodiment of the invention, rotary course of the rack within a cardiac cycle can be divided into one to add
Fast process and a moderating process.The accelerator makes average speed of the rack in sampling time window be greater than rack one
Average rotation rate in a cardiac cycle.The moderating process makes average speed of the rack outside sampling time window be less than machine
Average rotation rate of the frame within a cardiac cycle.In this way, average rotation speed of the rack within a cardiac cycle is still
It can satisfy the requirement of formula (1).
In one embodiment of the invention, the acceleration magnitude in accelerator can remain unchanged, can also be
Variation.In one embodiment of the invention, the deceleration size of moderating process can remain unchanged, and can also be varied.
In one embodiment of the invention, the acceleration magnitude of accelerator can be set as subtracting with moderating process
Velocity magnitude is equal.In one embodiment of the invention, point at the beginning of moderating process can be arranged in the sampling time
In window.Specifically, which can be arranged when rack is rotated up to maximum speed.It is more preferably real at one
It applies in example, in order to ensure the angle that can be rotated in sampling time window interior framework is maximum, rack can be entered into the sampling time
Momentary rate when window is equal to momentary rate when rack leaves the sampling time window.Of the invention another
In a embodiment, in the case where system provides supplementary speed reduction means, the size of deceleration can be much larger than the size of acceleration,
In the case, the time point that moderating process starts can be set after the end time point for being located at sampling time window and connect
The position of the end time point of nearly sampling time window.
No matter relationship between the deceleration size of acceleration magnitude and moderating process regardless of accelerator, also subtract
Which time point the time point of speed is arranged on, in one embodiment of the invention, can be by setting rack at one
The Mean Speed of cardiac cycle interior rotation, the duration of accelerator, the deceleration of moderating process, subtracts the acceleration of accelerator
The fortune such as point at the beginning of point, moderating process at the beginning of the duration of fast process, the minimum speed of rack rotation, accelerator
The method of several call parameters in dynamic parameter, to determine song that rate of the rack within a cardiac cycle changes over time
Line, and then control the speed of rotation of rack and determine the required sector number of scanning.
Step 103 may further include following steps 201 to 204 in one embodiment of the invention.With reference to Fig. 2,
The reality that rotation parameter in the method for rack speed of rotation when Fig. 2 show setting cardiac CT scan of the invention is set
Apply the flow diagram of example.
In step 201, average rotation rate, peak acceleration and the maximum according to rack within a cardiac cycle subtract
The minimum speed of rotation, acceleration duration, deceleration duration and rack of the speed computer frame within a cardiac cycle are in the sampling time
Mean Speed in window.
In one embodiment of the invention, can first be calculated by following formula (2) and (3) rack acceleration duration and
Deceleration duration.
ta+td=pT (2)
a·ta=dtd (3)
Wherein, the size for the peak acceleration that the equipment that a is expressed as rack acceleration is capable of providing, d are expressed as rack deceleration
The size of maximum deceleration that is capable of providing of equipment, taIt indicates to accelerate duration, tdIndicate deceleration duration, the meaning and formula of p, T
(1) identical in.
In one embodiment of the invention, the momentary rate when rack enters sampling time window is equal to machine
When momentary rate when frame leaves the sampling time window, following formula (4) and (5) computer rack can be further advanced by
In the acceleration duration and deceleration duration of sampling time window.
Wherein,Indicate acceleration time of the rack in sampling time window,Indicate rack in sampling time window
Deceleration time, τ, a, d is given value.
In one embodiment of the invention, following formula (6) and (7) computer rack can be further advanced by one
The average rotation rate of the minimum speed of rotation and rack in sampling time window in cardiac cycle.
Wherein, VminIndicating the minimum speed of rotation of the rack within a cardiac cycle, unit is cycle per second,Indicate rack
Average rotation rate in sampling time window, unit are cycle per second.For given value, it is equal to 1/Rw,It can pass through
Formula (2) is obtained to (5).
In step 202, needed for the Mean Speed according to rack in sampling time window and the value upper limit determine scanning
Sector number.
In one embodiment of the invention, sector number needed for scanning being determined by following formula (8).
Wherein, sector number needed for n indicates scanning, n, which can choose, to be greater than and closestValue.
In step 203, sampling time window length is adjusted.
WhenValue and step 202 in identified n value relatively when, in order to make full use of the acceleration capacity of system
And slowing down power(SDP), adjustable sampling time window length τ, so that adjustedValue be equal to step 202 in determine
Sector number n needed for scanning.
In step 204, according to sampling time window length adjusted, rack is recalculated within a week aroused in interest
Average rotation rate, accelerates duration and deceleration duration at the minimum speed of rotation.
Due to having adjusted sampling time window length τ in step 203, it is necessary to according to sampling time window adjusted
Length τ, when recalculating average rotation rate of the rack within a week aroused in interest, the minimum speed of rotation, accelerating duration and slow down
It is long.
In one embodiment of the invention, it can use above-mentioned formula (1) to (7), recalculate rack at one
Average rotation rate, the minimum speed of rotation, acceleration duration and deceleration duration in week aroused in interest.
The method of rack speed of rotation when showing setting cardiac CT scan of the invention with reference to Fig. 3, Fig. 3 another
The flow diagram of embodiment.
Step 101 shown in step 301 in Fig. 3 to step 303 and Fig. 1 and in above-mentioned method 100 is to 103 classes
Seemingly, which is not described herein again.
In step 304, judge whether to complete the scanning to all sectors.
If the cardiac CT scan to all sectors has all been completed, present scan terminates, and otherwise, enters step 305.
In step 305, the heart according to the cardiac cycle currently obtained, when prediction is scanned next cardiac cycle
The dynamic period.
Can be updated to the newest cardiac cycle got, then return step 201 cardiac cycle, after update
Cardiac cycle, recalculate all parameters in step 201 to 203, then by these parameters be used to control rack under
Rotation in one cardiac cycle.
This have the advantage that can overcome due to scanning error caused by changing during the scanning process cardiac cycle very
To failure.
The method of rack speed of rotation when showing setting cardiac CT scan of the invention with reference to Fig. 4, Fig. 4 another
The flow diagram of embodiment.
Step 401 in Fig. 4 is to step 403 and step 301 shown in Fig. 3 to 303 similar, and which is not described herein again.In Fig. 4
Step 404 and 405 similar with step 304 shown in Fig. 3 and 305 respectively, which is not described herein again.
Within step 306, when scanning is helical scanning, according to screw pitch coefficient, X-ray beam width and the rack speed of rotation
Calculate the movement rate of the bed of CT machine.
Method shown in Fig. 3 is suitable for carrying out the cardiac CT scan of more sectors using spiral scan pattern, due in spiral
In scanning process, the bed of CT machine can be moved, if rack is rotated by the way of non-uniform speed, the rate of bed motion can also be set
Count into the mode of non-uniform speed's movement.
According to one embodiment of present invention, the movement of the bed of CT machine can be determined and controlled using following formula (9)
Rate.
Movement rate=screw pitch coefficient * X-ray beam width * rack speed of rotation (9) of bed
Wherein, screw pitch coefficient is preset proportionality coefficient, is defined as rack and rotates a circle the move distance of patient bed
The ratio between with X-ray beam width (that is: coverage area of the X-ray beam in Z-direction).
So far the method according to an embodiment of the present invention for rack rate when setting cardiac CT scan is described.Due to
By the way of variable rate scanning, so that rack is rotated simultaneously in the acquisition window of cardiac cycle with the faster speed of rotation
The data of the sector of angle as big as possible are obtained, and in the non-acquired window of cardiac cycle, rack is rotated with slower rate
So that the average rotation speed of rack is matched with cardiac cycle.Therefore, the total time of CT heart scanning can be reduced, and is prevented
Failure is scanned due to caused by the cardiac cycle in scanning process.
Similar with this method, the present invention also provides corresponding devices.
One embodiment of the device 500 of rack speed of rotation when Fig. 5 show setting cardiac CT scan of the invention
Schematic block diagram.
As shown in figure 5, device 500 may include: time window upper limit determining module 501, for according to the aroused in interest of heart
Period determines the value upper limit of sampling time window length；Mean Speed chooses module 502, for according to the value upper limit and aroused in interest
Period chooses average rotation rate of the rack within a cardiac cycle；And rotation parameter setting module 503, for setting
The rotation parameter of rack is determined, so that rack is in the rotary course in a cardiac cycle, in sampling time window Nei Shiping
The equal speed of rotation is greater than the average rotation rate within a cardiac cycle.
In one embodiment of the invention, rotation parameter setting module 503 may further include: beginning parameter transform model
Module, for average rotation rate, peak acceleration and the maximum deceleration computer according to rack within a cardiac cycle
The minimum speed of rotation, acceleration duration, deceleration duration and rack putting down sampling time window in of the frame within a cardiac cycle
Equal rate；And sector number determining module, for the Mean Speed and the value according to rack in sampling time window
Sector number needed for the upper limit determines scanning.
In one embodiment of the invention, rotation parameter setting module 503 may further include: time window adjustment
Module, for adjusting sampling time window length；And kinematic parameter adjusts module, for according to sampling time window adjusted
Mouthful length, when recalculating average rotation rate of the rack within a week aroused in interest, the minimum speed of rotation, accelerating duration and slow down
It is long.
In one embodiment of the invention, device 500 may further include: cardiac cycle prediction module, be used for root
Cardiac cycle according to the cardiac cycle currently obtained, when prediction is scanned next cardiac cycle.
In one embodiment of the invention, device 500 may further include: the movement rate computing module of bed, use
In when scanning is helical scanning, the movement speed of the bed of CT machine is calculated according to the speed of rotation of screw pitch, X-ray beam width and rack
Rate.
So far the device according to an embodiment of the present invention for rack rate when setting cardiac CT scan is described.With it is upper
It is similar to state method, the device of the invention is due to by the way of variable rate scanning, so that acquisition of the rack in cardiac cycle
The data of the sector of angle as big as possible are rotated and obtained in window with the faster speed of rotation, and are adopted in the non-of cardiac cycle
Collect window, rack is matched with the average rotation speed that slower rate rotates so that rack with cardiac cycle.Therefore, can subtract
The total time of few CT heart scanning, and prevent from scanning failure due to caused by the cardiac cycle in scanning process.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (14)
1. a kind of method of rack speed of rotation when setting cardiac CT scan, characterized in that include: the heart according to the heart
The dynamic period determines the value upper limit of sampling time window length；
Average rotation rate of the rack within a cardiac cycle is chosen according to the value upper limit and the cardiac cycle；
And
The rotation parameter of the rack is set, so that the rack is in the rotary course in a cardiac cycle, described
Average rotation rate is greater than the average rotation rate within a cardiac cycle when in sampling time window.
2. according to the method described in claim 1, it is characterized in that, rotary course of the rack within a cardiac cycle includes
One accelerator and a moderating process.
3. according to the method described in claim 2, it is characterized in that, at the beginning of the moderating process point be located at the sampling when
Between in window.
4. according to the method described in claim 3, it is characterized in that, the rack enter the sampling time window when instantaneous speed
Rate is equal to the momentary rate when rack leaves the sampling time window.
5. according to the method described in claim 2, it is characterized in that, at the beginning of the moderating process point be set to be located at institute
After the end time point for stating sampling time window.
6. method described in any one of -5 according to claim 1, characterized in that the rotation ginseng of the setting rack
Number, so that the rack in the rotary course in a cardiac cycle, averagely rotates when in the sampling time window
Rate is greater than the step of average rotation rate within a cardiac cycle and further comprises:
According to average rotation rate, peak acceleration and maximum deceleration computer rack of the rack within a cardiac cycle
The minimum speed of rotation, acceleration duration, deceleration duration and rack being averaged in sampling time window within a cardiac cycle
Rate；And
Sector needed for determining the scanning according to Mean Speed of the rack in sampling time window and the value upper limit
Number.
7. according to the method described in claim 6, it is characterized in that, further comprise:
Adjust the sampling time window length；And
According to sampling time window length adjusted, average rotation rate of the rack within a week aroused in interest, most is recalculated
The small speed of rotation accelerates duration and deceleration duration.
8. according to the method described in claim 1, it is characterized in that, further comprise:
According to the cardiac cycle currently obtained, prediction carries out the cardiac cycle when scanning to next cardiac cycle.
9. according to the method described in claim 1, it is characterized in that, further comprise:
When the scanning is helical scanning, CT is calculated according to the speed of rotation of screw pitch coefficient, X-ray beam width and the rack
The movement rate of the bed of machine.
10. a kind of device of rack speed of rotation when setting cardiac CT scan, characterized in that include: that the time window upper limit is true
Cover half block, for determining the value upper limit of sampling time window length according to the cardiac cycle of the heart；
Mean Speed chooses module, for aroused in interest at one according to the value upper limit and the cardiac cycle rack is chosen
Average rotation rate in period；And
Rotation parameter setting module, for setting the rotation parameter of the rack, so that the rack is within a cardiac cycle
Rotary course in, average rotation rate is greater than average rotation within a cardiac cycle when in the sampling time window
Rotational speed rate.
11. device according to claim 10, characterized in that the rotation parameter setting module further comprises:
Beginning parameter transform model module, for according to average rotation rate of the rack within a cardiac cycle, maximum accelerate
The minimum speed of rotation, acceleration duration, deceleration duration and the rack of degree and maximum deceleration computer rack within a cardiac cycle
Mean Speed in sampling time window；And
Sector number determining module, for the Mean Speed and value upper limit determination according to rack in sampling time window
Sector number needed for the scanning.
12. device according to claim 11, characterized in that the rotation parameter setting module further comprises:
Time window adjusts module, for adjusting the sampling time window length；And kinematic parameter adjusts module, is used for root
According to sampling time window length adjusted, average rotation rate of the rack within a week aroused in interest, minimum rotation are recalculated
Rate accelerates duration and deceleration duration.
13. device according to claim 10, characterized in that further comprise:
Cardiac cycle prediction module, for according to cardiac cycle for currently obtaining, prediction is to described in carrying out next cardiac cycle
Cardiac cycle when scanning.
14. device according to claim 10, characterized in that further comprise:
The movement rate computing module of bed is used for when the scanning is helical scanning, according to screw pitch, X-ray beam width and institute
State the movement rate of the bed of the speed of rotation calculating CT machine of rack.
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| CN108226195B (en) * | 2017-12-28 | 2023-10-13 | 清华大学 | CT inspection system and CT imaging method |
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