CN102805632B - CT (computed tomography) apparatus and displacement compensation method and system thereof - Google Patents
CT (computed tomography) apparatus and displacement compensation method and system thereof Download PDFInfo
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Abstract
The invention discloses a CT (computed tomography) apparatus, compensation system and method for displacement of a patient in the CT apparatus, a computer program and a readable recording medium. The system comprises a camera, a first image processing unit, a second image processing unit, a displacement compensation unit and a storage unit, wherein the camera is used for acquiring a current image of a patient, the first image processing unit is used for determining a current profile of a target organ according to the image, the second image processing unit is used for determining a current rectangular area representing the current profile of the target organ, the displacement compensation unit is used for calculating displacement of the current rectangular area relative to a previous rectangular area and compensating the displacement, and the storage unit is used for maintaining the current rectangular area as the previous rectangular area. By the displacement compensation method and system, the displacement of the patient can be compensated without extra radiation dosage.
Description
Technical field
The present invention relates to medical domain, particularly the compensation method of patient movement in a kind of computed tomography (CT) machine, system and CT machine.
Background technology
As shown in Figure 1, when utilizing CT machine to carry out scanning imagery to human body, patient 101 is needed to be placed on the bed board 1021 of patient table 102, by mobile bed board 1021, the scanning area that patient 101 horizontal positioned sends into CT frame 103 just can be carried out scanography, when carrying out scanography, generally include the scanning in two stages, first stage is location scanning (toposcan), also it is the determination stage of sweep limits, for determining the angle of inclination of the original position, end position and the frame (gantry) that scan.Second stage is tomoscan (tomoscan), the namely real scanning imagery stage.In addition, after the scanning of second stage, sometimes also need for patient 101 injection of contrast medium carries out enhancing scanning, i.e. the scanning of three phases.
Wherein, if patient moves health before each scanning starts, namely patient position there occurs change, and operator is not when knowing this change, operator will be scanned according to the sweep limits initially determined, now just can obtain the scanning result of mistake, sometimes may need to re-start location scanning and follow-up tomoscan.And if operator has found the displacement of patient body, then need manually to compensate it, in a kind of situation, doctor may by rule of thumb from Row sum-equal matrix sweep limits, certain scanning errors certainly will be there is in this, in another kind of situation, doctor is unable to estimate out definite moving range, and need re-start location scanning and follow-up tomoscan to it.In addition, even if re-started location scanning, can not ensure that patient body can not move before the scanning of next stage.
Visible, in prior art, once patient body there occurs displacement between twice sweep, then not only can affect normal scanning process, lose time, also can increase a lot of originally unnecessary dose of radiation to patient.
Summary of the invention
In view of this, one aspect of the present invention proposes the compensation method of patient movement in a kind of CT machine, propose bucking-out system and the CT machine of patient movement in a kind of CT machine on the other hand, on the one hand propose a kind of computer program and computer-readable recording medium again, in order in the compensation without the need to realizing patient movement when additional radiation dosage.
The compensation method of patient movement in CT machine proposed by the invention, comprising:
A, utilize the current positive bit image being positioned at camera collection patient above patient;
B, before Current Scan starts, the body surface area of current positive bit image being carried out to target organ is detected, obtain the current body surface profile of described target organ in image coordinate system (rectangular coordinate system of such as image), according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determine the current rectangle region representing the current body surface profile of described target organ;
C, judge whether Current Scan is initial positioning scan, if so, then perform step G; Otherwise, perform step D and subsequent step;
D, calculating current rectangle region, relative to the displacement in the longitudinal direction of previous rectangular area, obtain the first shift value;
E, judge whether described first shift value is greater than default first threshold, if so, then perform step F and subsequent step; Otherwise, when scanning next time, returning and performing step B and subsequent step;
F, bit shift compensation is carried out to scanning starting position;
G, described current rectangle region to be stored as previous rectangular area, and when scanning next time, returning and performing step B and subsequent step.
Wherein, if former and later two borders of described previous rectangular area are respectively U
lastand D
last, former and later two borders in current rectangle region are respectively U (R
n) and D (R
n);
Described step D comprises: calculate M
n=| U (R
n)-U
last|+| D (R
n)-D
last| value.
Preferably, described step D comprises further: calculate current rectangle region relative to the displacement in the lateral direction of previous rectangular area, obtain the second shift value; Then before step G, the method comprises further:
E1, judge whether described second shift value is greater than default Second Threshold, if so, then perform step F 1; Otherwise, when scanning next time, returning and performing step B and subsequent step;
F1, to reconstruction the visual field carry out bit shift compensation.
Wherein, if the border, two, left and right of described previous rectangular area is respectively L
lastand R
last, the border, two, left and right in current rectangle region is respectively L (R
n) and R (R
n);
Described step D comprises: calculate N
n=| L (R
n)-L
last|+| R (R
n)-R
last| value.
Preferably, described camera is full-view camera, comprises further between steps A and step B: be the current positive bit image of the plan view of applicable human eye by utilizing the current normotopia Image Reconstruction of described camera collection.
The bucking-out system of patient movement in CT machine proposed by the invention, comprising:
Be positioned at the camera above patient, for gathering the current positive bit image of patient;
First graphics processing unit, for before each scanning starts, the body surface area of current positive bit image being carried out to target organ is detected, and obtains the current body surface profile of described target organ in image coordinate system;
Second graphics processing unit, for according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determines the current rectangle region representing the current body surface profile of described target organ;
Bit shift compensation unit, for before each scanning starts, if there is previous rectangular area in memory cell, then calculate current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area, obtain the first shift value, when described first shift value is greater than default first threshold, bit shift compensation is carried out to scanning starting position;
Memory cell, for before initial positioning scan, previous rectangular area when the current rectangle region determined by second graphics processing unit was scanned as next time stores, and when displacement compensating unit is determined to need to carry out bit shift compensation, the previous rectangular area when current rectangle region determined by the second graphics processing unit was scanned as next time stores.
Wherein, if former and later two borders of described previous rectangular area are respectively U
lastand D
last, former and later two borders in current rectangle region are respectively U (R
n) and D (R
n);
Described bit shift compensation unit calculates current rectangle region relative to previous rectangular area displacement M in the longitudinal direction
n=| U (R
n)-U
last|+| D (R
n)-D
last|, at described M
nbe greater than first threshold T
1time, bit shift compensation is carried out to scanning starting position.
Preferably, described bit shift compensation unit calculates current rectangle region further relative to the displacement in the lateral direction of previous rectangular area, obtains the second shift value, when described second shift value is greater than the Second Threshold of setting, carries out bit shift compensation to the reconstruction visual field.
Wherein, if the border, two, left and right of described previous rectangular area is respectively L
lastand R
last, the border, two, left and right in current rectangle region is respectively L (R
n) and R (R
n);
Described bit shift compensation unit calculates current rectangle region relative to previous rectangular area displacement N in the lateral direction
n=| L (R
n)-L
last|+| R (R
n)-R
last|, at described N
nbe greater than first threshold T
2time, bit shift compensation is carried out to the reconstruction visual field.
Preferably, described camera is full-view camera; This system comprises further: the 3rd graphics processing unit, for by the current normotopia Image Reconstruction of described camera collection being the current positive bit image of the plan view of applicable human eye, and the current positive bit image after reconstruct is exported to the first graphics processing unit.
CT machine proposed by the invention, comprising: the bucking-out system of patient movement in the CT machine of any one specific implementation form above-mentioned.
Computer program proposed by the invention, when described computer program runs in a machine, can make described machine perform the compensation method of patient movement in the CT machine of any one specific implementation form above-mentioned.
Computer-readable recording medium proposed by the invention, stores above-mentioned computer program.
As can be seen from such scheme, owing to utilizing the image of optical camera collection patient in the present invention, and before each scanning, target organ identification is carried out to image, and identify the current rectangle region of corresponding target organ, when present scan is initial positioning scan, the current rectangle region obtained is stored as initial previous scan region, when present scan is non-initial location scanning, calculate current rectangle region moving forward and backward relative to previous rectangular area, when the amount of moving forward and backward is greater than default scan compensation threshold value, bit shift compensation is carried out to sweep limits, and the previous scan region of the current rectangle region this obtained when scanning as next time stores, thus achieve when without the need to the compensation to patient movement when additional radiation dosage, the scan image obtained is met the demands.
Further, by calculating the left and right displacement of current rectangle region relative to previous rectangular area, when left and right displacement amount is greater than default visual field compensation threshold value, bit shift compensation is carried out to the reconstruction visual field, thus scan image can be gone out by accurate reconstruction.
In addition, in addition, by utilizing full-view camera to gather optical imagery, can expand and gather visual angle, adding the applicability of system.
Accompanying drawing explanation
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention, in accompanying drawing:
Fig. 1 is schematic diagram when utilizing CT machine to scan.
Fig. 2 is the schematic flow sheet of the compensation method of patient movement in CT machine in the embodiment of the present invention.
Fig. 3 is image processing process schematic diagram when carrying out abdomen scanning in the embodiment of the present invention.
Fig. 4 is the structural representation of the bucking-out system of patient movement in CT machine in the embodiment of the present invention.
Fig. 5 is the schematic diagram of the position relationship in the embodiment of the present invention between camera and patient.
In figure: 101-patient 102-inspection desk 103-CT frame 1021-bed board
201-gathers displacement 205-that patient image 202-determines that the current rectangle region 203-of corresponding target organ determines whether that initial positioning scan 204-calculates relatively previous rectangular area, current rectangle region and judges that the whether super first threshold of the first shift value 205 '-judge the whether super Second Threshold 206-of the second shift value compensates 206 ' to scanning-compensates 207-storage current rectangle region to rebuilding the visual field
401-camera 402-first graphics processing unit 403-second graphics processing unit 404-bit shift compensation unit 405-memory cell 406-the 3rd graphics processing unit
Detailed description of the invention
In the present invention, in order to avoid causing above-mentioned adverse influence when patient body is subjected to displacement, consider to carry out automatic monitoring to the health displacement of patient, and this automatic monitoring realizes based on the image of optical camera collection, when monitoring displacement and reaching setting threshold value, when namely may have an impact to scanning result, bit shift compensation is carried out to sweep limits.Further, also bit shift compensation can be carried out to the reconstruction visual field (FOV, Field of View).Thus can in the compensation without the need to realizing patient movement when additional radiation dosage.
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in more detail by the following examples.
Fig. 2 is the schematic flow sheet of the compensation method of patient movement in the CT machine of the embodiment of the present invention.As shown in the bold portion in Fig. 2, the method comprises the steps:
Step 201, utilizes the current positive bit image of the camera collection patient be positioned at above patient.
In this step, the camera be positioned at above patient can be fixed in CT frame, and also can be positioned on the device outside independent of CT frame, concrete installation site can be determined according to actual needs.
Step 202, before Current Scan starts, the body surface area of current positive bit image being carried out to target organ is detected, obtain the current body surface profile of described target organ in image coordinate system (in the present embodiment be that example be described with the rectangular co-ordinate of image), according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determine the current rectangle region representing the current body surface profile of described target organ.
In the present embodiment, to carry out the situation of abdomen scanning, Fig. 3 is image processing process schematic diagram when carrying out abdomen scanning in the embodiment of the present invention.As shown in Figure 3, if Current Scan is n-th scanning, then the current positive bit image carrying out body surface area detection can be designated as I
n.In this step, multiple existing detection algorithm can be utilized to carry out body surface area detection to current positive bit image, as automated regional detection method (ARD, Auto Region Detection) etc. can be utilized, a series of some P of the current body surface profile of corresponding target organ can be obtained afterwards
t(x, y), these points constitute the current body surface profile of target organ in image coordinate system.Find out these P
t(x, y) maximum x on x coordinate
maxwith minimum of a value x
minand these P
t(x, y) maximum y on y coordinate
maxwith minimum of a value y
min, the coordinate points (x formed by these four values
min, y
min), (x
min, y
max), (x
max, y
min), (x
max, y
max) determine the current rectangle region R representing the current body surface profile of target organ
n, in Fig. 3, use U (R respectively
n) and D (R
n) represent rectangular area R
ntwo borders up and down, with L (R
n) and R (R
n) represent rectangular area R
nborder, two, left and right.
Step 203, judges whether Current Scan is initial positioning scan, if so, then performs step 207; Otherwise, perform step 204 and subsequent step.
In the present embodiment, consider that initial positioning scan is the initial sweep opening the scanning of this flow process, therefore there is not the problem of carrying out displacement monitoring with the sweep limits of last scan before initial positioning scan, therefore can directly in step 207 using the current rectangle region of representative target organ current body surface profile determined before initial positioning scan as initial previous rectangular area, to carry out the comparison of patient movement when carrying out scanning next time.And for other scanning, owing to needing to carry out displacement monitoring with the sweep limits of last scan, therefore need the displacement performed in step 204 to calculate.
Step 204, calculates current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area, obtains the first shift value.
In this step, supposing that the initial point of image coordinate system is positioned at the upper left corner of image, and be to the right the square of x, is downwards the positive direction of y, then in step 202 by coordinate points (x
min, y
min), (x
min, y
max), (x
max, y
min), (x
max, y
max) the rectangular area R that forms
nif as shown in Figure 3, remember that its upper and lower two borders are respectively U (R
n) and D (R
n), then U (R
n) value be y
min, D (R
n) value be y
max.
If remember, former and later two borders of previous rectangular area are respectively U
lastand D
last, then, in this step, M can be calculated
n=| U (R
n)-U
last|+| D (R
n)-D
last|, then M
nresult of calculation be current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area.
In practical application, current rectangle region also can adopt other algorithms to calculate relative to the displacement in the longitudinal direction of previous rectangular area, such as, also can calculate
or only calculate M
n=| U (R
n)-U
last|, or M
n=| D (R
n)-D
last| etc.
Step 205, judges whether described first shift value is greater than default first threshold, if so, then performs step 206 and subsequent step; Otherwise, when scanning next time, returning and performing step 202 and subsequent step.
In the present embodiment, in order to reduce cost of compensation, avoiding also carrying out bit shift compensation when there is micro-displacement, scan compensation threshold value, i.e. a first threshold T can be preset
1, as the first shift value M
nexceed this first threshold T
1time, then perform the bit shift compensation in step 206; Otherwise, when scanning next time, can return and performing step 202 and subsequent step.
Step 206, carries out bit shift compensation to scanning starting position.
In this step, when carrying out bit shift compensation to scanning starting position, according to the direction of scanning direction and image, scanning starting position can be arranged at U (R
n) place or D (R
n) place, such as, if when scanning direction is consistent with image direction, then scanning starting position is arranged at U (R
n) place, if when scanning direction is contrary with image direction, then scanning direction is arranged at D (R
n) place.
Step 207, stores current rectangle region as previous rectangular area, and when scanning next time, returning and performing step B and subsequent step.
Further, also can to the reconstruction visual field (FOV in the present embodiment, Field of View) carry out bit shift compensation, namely as shown in the dotted portion in Fig. 2, current rectangle region can be calculated in step 204 further relative to the displacement in the lateral direction of previous rectangular area, obtain the second shift value.
Then in step 202 by coordinate points (x
min, y
min), (x
min, y
max), (x
max, y
min), (x
max, y
max) the rectangular area R that forms
nif as shown in Figure 3, about remembering it, two borders are respectively L (R
n) and R (R
n), then L (R
n) value be x
max, R (R
n) value be x
min.
If remember, former and later two borders of previous rectangular area are respectively L
lastand R
last, then, in this step, N can be calculated
n=| L (R
n)-L
last|+| R (R
n)-R
last|, then M
nresult of calculation be current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area.
In practical application, current rectangle region also can adopt other algorithms to calculate relative to the displacement in the longitudinal direction of previous rectangular area, such as, also can calculate
or only calculate N
n=| L (R
n)-L
last‖, or N
n=| R (R
n)-R
last| etc.
Meanwhile, the method also needs to comprise the steps: further
Step 205 ', judge whether described second shift value is greater than default Second Threshold, if so, then perform step 206 ' and subsequent step; Otherwise, when scanning next time, returning and performing step 202 and subsequent step.
In the present embodiment, in order to reduce cost of compensation, avoiding also carrying out bit shift compensation when there is micro-displacement, a visual field can be preset and compensate threshold value, i.e. Second Threshold T
2, when second moves value N
nexceed this Second Threshold T
2time, then perform step 206 ' in bit shift compensation; Otherwise, when scanning next time, can return and performing step 202 and subsequent step.
Step 206 ', bit shift compensation is carried out to the reconstruction visual field.
In this step, when carrying out bit shift compensation to the reconstruction visual field, can according to the right boundary L (R in current rectangle region
n) and R (R
n) redefine the center and scope that rebuild the visual field.
In practical application, above-mentioned camera can be common camera, as long as can meet current angular field of view.Or, in order to expand angular field of view, above-mentioned camera also can be full-view camera, now, before execution step 202, namely between step 201 and step 202, comprise further: the current positive bit image by the current normotopia Image Reconstruction of described camera collection being the plan view of applicable human eye, performs step 202 and subsequent step afterwards again.
In addition carry out between, during specific implementation, step 207 also can be carried out between step 205 and step 206, or in step 205 ' and step 206 '.
Below to carry out situation during abdomen scanning, be illustrated the scanning process of said method of the present invention should be had.
Step 1, patient lies on inspection desk bed board.
Step 2, operator formulates scan plan, comprising: location scanning (Topo), belly tomoscan (AbodomenRoutine), abdominal contrast enhancement scanning (Contrast AdobomenRoutine).
Step 3, before location scanning, the current positive bit image I of record camera collection
1, determine the coboundary U of belly rectangular area
1with lower boundary D
1, and make U
last=U
1, D
last=D
1.
Step 4, positions scanning.
Step 5, before belly tomoscan, the current positive bit image I of record camera collection
2, determine the coboundary U of belly rectangular area
2with lower boundary D
2.
Step 6, calculates the amount of moving forward and backward M
2=| U
2-U
last|+| D
2-D
last) |.
Step 7, judges M
2whether be greater than the first threshold of setting, if be greater than, then bit shift compensation carried out to scanning starting position; Otherwise, can not compensate.Here hypothesis is greater than, and therefore needs to carry out bit shift compensation, if scanning direction is consistent with image direction, then scanning starting position is arranged on U
2place, meanwhile, makes U
last=U
2, D
last=D
2.
Step 8, carries out belly tomoscan.
Step 9, operator injects some contrast medium to patient.
Step 10, before abdominal contrast enhancement scanning, the current positive bit image I of record camera collection
3, determine the coboundary U of belly rectangular area
3with lower boundary D
3.
Step 11, calculates the amount of moving forward and backward M
3=| U
3-U
last|+| D
3-D
last) |.
Step 12, judges M
3whether be greater than the first threshold of setting, if be greater than, then bit shift compensation carried out to scanning starting position; Otherwise, can not compensate.Here hypothesis is not more than, therefore without the need to carrying out bit shift compensation and parameter update process.
Step 13, carries out abdominal contrast enhancement scanning.
Similar to the compensation process and the above-mentioned compensation process to sweep limits of rebuilding the visual field, no longer illustrate herein.
Above the compensation method of patient movement in the CT machine of the embodiment of the present invention is described in detail, again the bucking-out system of patient movement in the CT machine of the embodiment of the present invention has been described in detail below.
Fig. 4 is the structural representation of the bucking-out system of patient movement in the CT machine of the embodiment of the present invention.As shown in the bold portion in Fig. 4, this system can comprise: camera 401, first graphics processing unit 402, second graphics processing unit 403, bit shift compensation unit 404 and memory cell 405.
Wherein, camera 401, is positioned at the top of patient, for gathering the current positive bit image of patient.This camera 401 can be fixed in CT frame, and also can be positioned on the device outside independent of CT frame, concrete installation site can be determined according to actual needs.Fig. 5 is the schematic diagram of the position relationship in the embodiment of the present invention between camera and patient.As shown in Figure 5, camera 401 is positioned at the top of patient 101, for gathering the positive bit image of patient 101.
First graphics processing unit 402, for before each scanning starts, the body surface area of current positive bit image being carried out to target organ is detected, and obtains the current body surface profile of described target organ in image coordinate system.Can be consistent with the description in said method step 202, this first graphics processing unit 402 can utilize multiple existing detection algorithm to carry out body surface area detection to current positive bit image, as automated regional detection method (ARD can be utilized, Auto Region Detection) etc., a series of some P of the current body surface profile of corresponding target organ can be obtained afterwards
t(x, y), these P
t(x, y) constitutes the current body surface profile of target organ in image coordinate system.
Second graphics processing unit 403, for according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determines the current rectangle region representing the current body surface profile of described target organ.Can be consistent with the description in said method step 202, this second graphics processing unit 403 can find out these P equally
t(x, y) maximum x on x coordinate
maxwith minimum of a value x
minand these P
t(x, y) maximum y on y coordinate
maxwith minimum of a value y
min, the coordinate points (x formed by these four values
min, y
min), (x
min, y
max), (x
max, y
min), (x
max, y
max) determine the current rectangle region R representing the current body surface profile of target organ
n.
Bit shift compensation unit 404, for before each scanning starts, if there is previous rectangular area in memory cell 405, then calculate current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area, obtain the first shift value, when described first shift value is greater than default first threshold, bit shift compensation is carried out to scanning starting position.This bit shift compensation unit 404 calculating first shift value and whether carry out the bit shift compensation scanned specific implementation process can be consistent with the detailed process described in above-mentioned steps 204-206.Such as, if remember, former and later two borders of previous rectangular area are respectively U
lastand D
last, former and later two borders in current rectangle region are respectively U (R
n) and D (R
n), then bit shift compensation unit 404 can calculate M
n=| U (R
n)-U
last|+| D (R
n)-D
last|, at described M
nbe greater than first threshold T
1time, bit shift compensation is carried out to scanning starting position.Certainly, also can calculate
or only calculate M
n=| U (R
n)-U
last|, or M
n=| D (R
n)-D
last| etc.
Memory cell 405, for before initial positioning scan, previous rectangular area when being scanned as next time in the current rectangle region that the second graphics processing unit 403 is determined stores, and when displacement compensating unit 404 is determined to need to carry out bit shift compensation, previous rectangular area when being scanned as next time in the current rectangle region that the second graphics processing unit 403 is determined stores.
Further, can be consistent with the description in said method step 204, step 205 ' and step 206 ', bit shift compensation unit 404 in the present embodiment also can calculate current rectangle region relative to the displacement in the lateral direction of previous rectangular area, obtain the second shift value, when described second shift value is greater than the Second Threshold of setting, bit shift compensation is carried out to the reconstruction visual field.Such as, if remember, the border, two, left and right of previous rectangular area is respectively L
lastand R
last, the border, two, left and right in current rectangle region is respectively L (R
n) and R (R
n); Then bit shift compensation unit 404 can calculate N
n=| L (R
n)-L
last|+| R (R
n)-R
last|, at described N
nbe greater than first threshold T
2time, bit shift compensation is carried out to the reconstruction visual field.Certainly, also can calculate
or only calculate N
n=| L (R
n)-L
last‖, or N
n=| R (R
n)-R
last| etc.
In the present embodiment, when camera 401 is full-view camera, this system is further as the dotted portion in Fig. 3 comprises: the 3rd graphics processing unit 406 between camera 401 and the first graphics processing unit 402, current normotopia Image Reconstruction for being gathered by described camera 401 is the current positive bit image of the plan view of applicable human eye, and the current positive bit image after reconstruct is exported to the first graphics processing unit 402.
CT machine in the embodiment of the present invention can comprise the bucking-out system of patient movement in the CT machine of above-mentioned arbitrary specific implementation form.
Present invention also offers a kind of machine-readable storage medium, storing the instruction for making a machine perform the sweep limits defining method of CT machine as described herein.Particularly, the system or device of being furnished with storage medium can be provided, store the software program code of the function realizing any embodiment in above-described embodiment on the storage medium, and make the computer of this system or device (or CPU or MPU) read and perform the program code be stored in storage medium.
In this case, can realize the function of any one embodiment above-described embodiment from the program code of storage medium reading itself, therefore program code and program code stored storage medium constitute a part of the present invention.
Floppy disk, hard disk, magneto-optic disk, CD (as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), tape, Nonvolatile memory card and ROM is comprised for providing the storage medium embodiment of program code.Selectively, can by communication network from download program code server computer.
In addition, be noted that, not only can by performing the program code read-out by computer, and by making the operating system etc. of calculating hands-operation carry out practical operation partly or completely based on the instruction of program code, thus the function of any one embodiment in above-described embodiment can be realized.
In addition, be understandable that, in the memory program code read by storage medium being write in memory set in the expansion board inserted in computer or arrange in writing the expanding element that is connected with computer, instruction subsequently based on program code makes the CPU etc. be arranged on expansion board or expanding element perform part and whole practical operation, thus realizes the function of any embodiment in above-described embodiment.
The invention discloses the bucking-out system of patient movement in a kind of CT machine, method, CT machine, computer program and readable medium recording program performing.Wherein, system comprises: for gathering the camera of the present image of patient, for the first graphics processing unit according to the current body surface profile of described image determination target organ, for determining second graphics processing unit in the current rectangle region representing the current body surface profile of described target organ, for calculating current rectangle region relative to previous rectangular area displacement and the bit shift compensation unit compensated, for the memory cell carried out as previous rectangular area keeping in current rectangle region.Technical scheme disclosed in this invention can in the compensation without the need to realizing patient movement when additional radiation dosage.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a patient movement's bucking-out system in CT machine, it is characterized in that, this system comprises:
Be positioned at the camera (401) above patient, for gathering the current positive bit image of patient;
First graphics processing unit (402), for before each scanning starts, the body surface area of current positive bit image being carried out to target organ is detected, and obtains the current body surface profile of described target organ in image coordinate system;
Second graphics processing unit (403), for according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determines the current rectangle region representing the current body surface profile of described target organ;
Bit shift compensation unit (404), for before each scanning starts, if there is previous rectangular area in memory cell, then calculate current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area, obtain the first shift value, when described first shift value is greater than default first threshold, bit shift compensation is carried out to scanning starting position;
Memory cell (405), for before initial positioning scan, store the current rectangle region that the second graphics processing unit is determined, previous rectangular area during to scan as next time, and when displacement compensating unit is determined to need to carry out bit shift compensation, store the current rectangle region that the second graphics processing unit is determined, previous rectangular area during to scan as next time.
2. system according to claim 1, is characterized in that,
Described bit shift compensation unit (404) is according to M
n=| U (R
n)-U
last|+| D (R
n)-D
last|, calculate current rectangle region relative to the displacement in the longitudinal direction of previous rectangular area, wherein, U
lastand D
lastbe respectively former and later two borders of described previous rectangular area, U (R
n) and D (R
n) be respectively former and later two borders in current rectangle region.
3. system according to claim 1, it is characterized in that, described bit shift compensation unit (404) calculates current rectangle region further relative to the displacement in the lateral direction of previous rectangular area, obtain the second shift value, when described second shift value is greater than the Second Threshold of setting, bit shift compensation is carried out to the reconstruction visual field.
4. system according to claim 3, is characterized in that,
Described bit shift compensation unit (404) is according to N
n=| L (R
n)-L
last|+| R (R
n)-R
last| calculate current rectangle region relative to the displacement in the lateral direction of previous rectangular area, wherein, L
lastand R
lastbe respectively the border, two, left and right of described previous rectangular area, L (R
n) and R (R
n) be respectively the border, two, left and right in current rectangle region.
5. system according to any one of claim 1 to 4, is characterized in that, described camera (401) is full-view camera; This system comprises further: the 3rd graphics processing unit (406), for by the current normotopia Image Reconstruction of described camera collection being the current positive bit image of the plan view of applicable human eye, and the current positive bit image after reconstruct is exported to the first graphics processing unit.
6. a CT machine, is characterized in that, this CT machine comprises: the bucking-out system of patient movement in the CT machine according to any one of claim 1 to 5.
7. a patient movement's compensation method in CT machine, it is characterized in that, the method comprises:
A, utilize the current positive bit image (201) being positioned at camera collection patient above patient;
B, before Current Scan starts, the body surface area of current positive bit image being carried out to target organ is detected, obtain the current body surface profile of described target organ in image coordinate system, according to the maximum of described current body surface profile in described image coordinate system both direction and minimum of a value, determine the current rectangle region (202) representing the current body surface profile of described target organ;
C, judge whether Current Scan is initial positioning scan, if so, then perform step G; Otherwise, perform step D and subsequent step (203);
D, calculating current rectangle region, relative to the displacement in the longitudinal direction of previous rectangular area, obtain the first shift value (204);
E, judge whether described first shift value is greater than default first threshold, if so, then perform step F and subsequent step; Otherwise, when scanning next time, returning and performing step B and subsequent step (205);
F, bit shift compensation (206) is carried out to scanning starting position;
G, described current rectangle region to be stored as previous rectangular area, and when scanning next time, returning and performing step B and subsequent step (207).
8. method according to claim 7, is characterized in that,
Described step D comprises: calculate M
n=| U (R
n)-U
last|+| D (R
n)-D
last| value as the first shift value, wherein U
lastand D
lastbe respectively former and later two borders of described previous rectangular area, U (R
n) and D (R
n) be respectively former and later two borders in current rectangle region.
9. method according to claim 7, is characterized in that, described step D comprises further: calculate current rectangle region relative to the displacement in the lateral direction of previous rectangular area, obtain the second shift value; Then before step G, the method comprises further:
E1, judge whether described second shift value is greater than default Second Threshold, if so, then perform step F 1; Otherwise, when scanning next time, returning and performing step B and subsequent step (205 ');
F1, to reconstruction the visual field carry out bit shift compensation (206 ').
10. method according to claim 9, is characterized in that,
Described step D comprises: calculate N
n=| L (R
n)-L
last|+| R (R
n)-R
last| value as the second shift value, wherein, L
lastand R
lastbe respectively the border, two, left and right of described previous rectangular area, L (R
n) and R (R
n) be respectively the border, two, left and right in current rectangle region.
11. methods according to any one of claim 7 to 10, it is characterized in that, described camera is full-view camera, then comprise further between steps A and step B: be the current positive bit image of the plan view of applicable human eye by utilizing the current normotopia Image Reconstruction of described camera collection.
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| CN103142230B (en) * | 2013-03-27 | 2015-05-27 | 深圳安科高技术股份有限公司 | Magnetic resonance positioning scanning method and device |
| CN104346815B (en) * | 2013-07-29 | 2017-10-31 | 上海西门子医疗器械有限公司 | Patient movement's monitoring method, system and X-ray imaging device in exposure process |
| CN107320124A (en) * | 2017-06-28 | 2017-11-07 | 上海联影医疗科技有限公司 | The method and medical image system of spacer scanning are set in medical image system |
| CN107456236B (en) * | 2017-07-11 | 2020-09-15 | 东软医疗系统股份有限公司 | Data processing method and medical scanning system |
| CN111297383A (en) * | 2019-12-24 | 2020-06-19 | 上海联影医疗科技有限公司 | Correction method, device and storage medium for X-ray imaging |
| CN112365492A (en) * | 2020-11-27 | 2021-02-12 | 上海联影医疗科技股份有限公司 | Image scanning method, image scanning device, electronic equipment and storage medium |
| CN114098968B (en) * | 2021-12-28 | 2022-05-27 | 珠海维尔康生物科技有限公司 | Quick positioning and tracking device of auxiliary robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101675887A (en) * | 2008-09-17 | 2010-03-24 | 株式会社东芝 | Ultrasonic diagnostic apparatus and image display method |
| CN101952837A (en) * | 2008-01-15 | 2011-01-19 | 艾可瑞公司 | The use of the single radioscopic image of the three-dimensional imaging centering of the quality assurance that is used to follow the tracks of |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7783096B2 (en) * | 2005-10-17 | 2010-08-24 | Siemens Corporation | Device systems and methods for imaging |
| US8467497B2 (en) * | 2007-10-25 | 2013-06-18 | Tomotherapy Incorporated | System and method for motion adaptive optimization for radiation therapy delivery |
-
2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101952837A (en) * | 2008-01-15 | 2011-01-19 | 艾可瑞公司 | The use of the single radioscopic image of the three-dimensional imaging centering of the quality assurance that is used to follow the tracks of |
| CN101675887A (en) * | 2008-09-17 | 2010-03-24 | 株式会社东芝 | Ultrasonic diagnostic apparatus and image display method |
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