CN103767722B - The localization method that CT or PET-CT system and carrying out scans - Google Patents
The localization method that CT or PET-CT system and carrying out scans Download PDFInfo
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Abstract
The invention discloses a kind of CT or PET-CT system and carry out the localization method that scans, this system comprises imaging device, picture processing device, patient can not be subject to X-radiation when utilizing this CT or PET-CT system to position, and decreases the healthy hidden danger of patient.In addition, existing CT or PET-CT system carries out often needing in the localization method scanned to make examinating couch move a very long time, scan to obtain spacer to patient in examinating couch moving process, could plan subsequent examination further according to spacer, it mainly comprises acquisition, and examinating couch starts scanning position parameter, examinating couch terminates scanning position parameter.But this scheme is long for positioning time, and examinating couch keeps motionless when utilizing CT or PET-CT system of the present invention to position, by the beginning scanning position of examinating couch and the end scanning position of examinating couch just can be learnt after take pictures, measure electronic photo and calculating, shorten positioning time.
Description
Technical field
The present invention relates to computed tomography (ComputedTomography, be called for short CT) technology, particularly relating to a kind of CT or PET-CT(positronemissiontomography-ComputedTomography, Positron emission computed tomography) system and a kind of CT or PET-CT system carry out the localization method that scans.
Background technology
Computed tomography scans by certain thickness aspect the specific part of human body by X-ray, and when X-ray directive tissue, part ray is absorbed by tissue, and part ray is received by detector through human body, produces signal.Because the density degree of the various tissue of human body is different, the penetration capacity of X-ray is different, so the ray that detector receives just has had difference.Processed by computer after changing received this discrepant ray signal into digital information, and formed and at the image of fluorescence screen display, can find the tiny pathological changes at any position in body according to this image.PET and CT organically combines by PET-CT, uses same examinating couch and same image processing workstations, by PET image and CT image co-registration, to reflect pathophysiological change and the morphosis of focus simultaneously, improves the accuracy of diagnosis.
Before scanning human body specific part in CT system or PET-CT system, conveniently doctor can accurately define the scope that human body need scan, and first needs to position scanning, can obtain spacer (topogramm) through location scanning.Spacer is the preliminary image obtained before carrying out main tomoscan, it refers to that the angle (normotopia or position, side) x-ray source being placed in requirement maintains static, and automatically patient to be sent in frame and carry out the spacer of the similar x-ray plain film of a series of X-ray exposure gained with implantation.Operator can select the angle of rack inclining according to spacer, and on spacer, beginning scanning position, the end scanning position at prescan position, the angle thickness at prescan position can be marked with reference line, then, only can scan the specific part of human body with the labelling that reference line is made according on spacer.
Particularly, the localization method that CT system or PET-CT system carry out scanning comprises the following steps: after patient lies low on examinating couch, control examinating couch and move a segment distance, CT scan is carried out in examinating couch moving process, obtain spacer as shown in Figure 1, spacer shows location picture, the computer of CT system or PET-CT system can obtain the starting position parameter (unit is millimeter) of examinating couch, the end position parameter (unit is millimeter) of examinating couch, the starting position parameter (unit is pixel) of location picture, the end position parameter (unit is pixel) of location picture, then, on the picture of location, mark the beginning scanning position at prescan position and the end scanning position at prescan position with reference line, the beginning scanning position parameter (unit is pixel) at prescan position and the end scanning position parameter (unit is pixel) at prescan position can be known on computers, can know that according to computing formula (1) examinating couch corresponding to beginning scanning position at prescan position starts scanning position parameter, can know that according to computing formula (2) examinating couch corresponding to end scanning position at prescan position terminates scanning position parameter.
(the starting position parameter of the end position parameter-examinating couch of examinating couch): (the starting position parameter of the end position parameter-location picture of location picture)=(the starting position parameter-examinating couch of examinating couch starts scanning position parameter): (the beginning scanning position parameter of the starting position parameter-location picture of location picture) (1)
(the starting position parameter of the end position parameter-examinating couch of examinating couch): (the starting position parameter of the end position parameter-location picture of location picture)=(the starting position parameter-examinating couch of examinating couch terminates scanning position parameter): (the end scanning position parameter of the starting position parameter-location picture of location picture) (2)
Know that examinating couch starts after scanning position and examinating couch terminate scanning position, to control examinating couch and move to beginning scanning position, and start to carry out CT scan, until examinating couch moves to end scanning position, thus can obtain the CT image of human body specific part.
But, above-mentioned CT system or PET-CT system carry out often needing in the localization method scanned to make examinating couch move a very long time, scan to obtain spacer to patient in the moving process of examinating couch, just can learn that examinating couch starts scanning position parameter and examinating couch terminates scanning position parameter according to spacer, not only make positioning time long, patient also can be made to be subject to a lot of X-radiation.
Summary of the invention
The object of the invention is to solve the problem that when utilizing existing CT system or PET-CT system to position, positioning time is long, patient is subject to a lot of radiation.
To achieve these goals, the invention provides a kind of CT or PET-CT system, it comprises:
Examinating couch;
Comprise the x-ray system of x-ray source and X-ray detector;
And there is the primary standard substance at interval between described x-ray system;
For obtaining the imaging device of the electronic photo showing patient's prescan position;
Picture processing device, for obtaining the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, and described picture processing device comprises:
Photo measuring unit, for showing electronic photo captured by described imaging device, and scanning position is started to prescan position in described electronic photo, relative distance that prescan position is terminated between scanning position, primary standard substance measures;
Computing unit, start scanning position for prescan position in the electronic photo that obtains according to described photo measuring unit, relative distance that prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, the actual range between primary standard substance and x-ray system, obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
Alternatively, described imaging device is photographing unit or photographic head.
Alternatively, described imaging device is arranged on above described examinating couch or side.
Alternatively, described primary standard substance is imaging device optical center line; Or described primary standard substance is the projection, groove, the printed patterns that are fixedly installed on described examinating couch.
Alternatively, described picture processing device is computer, and described photo measuring unit is that the photo on described picture processing device shows and processing module.
Alternatively, the imaging device control device be connected with described imaging device is also comprised.
Alternatively, described picture processing device is connected with described imaging device.
Alternatively, also comprise the horizontal movement device doing to move horizontally for ordering about described examinating couch, and for controlling the motion of described horizontal movement device, and being suitable for the horizontal movement device control device of Real-time Obtaining examinating couch location parameter, described horizontal movement device control device is connected with described picture processing device.
Alternatively, described horizontal movement device control device is computer.
Based on above-mentioned CT or PET-CT system, present invention also offers the localization method that a kind of above-mentioned CT or PET-CT system carries out scanning, it comprises:
Patient lies low after on examinating couch, and imaging device obtains the electronic photo showing patient's prescan position;
Picture processing device is utilized to process described electronic photo, to obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, the step that described electronic photo processes is comprised:
Utilize photo measuring unit to show described electronic photo, and scanning position is started to prescan position in described electronic photo, relative distance that prescan position is terminated between scanning position, primary standard substance measures;
Start scanning position according to prescan position on measured electronic photo, relative distance that prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, the actual relative distance that computing unit calculates that prescan position starts scanning position, prescan position is terminated between scanning position, primary standard substance;
In conjunction with the actual range between primary standard substance and x-ray system, computing unit calculates the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
Alternatively, the step that described electronic photo processes is comprised:
Utilize photo measuring unit to show described electronic photo, and the relative distance that prescan position in described electronic photo starts relative distance between scanning position and primary standard substance and prescan position to terminate between scanning position and primary standard substance is measured;
Prescan position in measured electronic photo is started the enlargement ratio of the relative distance between scanning position and primary standard substance divided by imaging device by computing unit, to obtain the actual relative distance that prescan position starts between scanning position and primary standard substance, the enlargement ratio of the relative distance between scanning position and primary standard substance divided by imaging device is terminated at prescan position in measured electronic photo, to obtain the actual relative distance that prescan position is terminated between scanning position and primary standard substance;
When prescan position start scanning position than primary standard substance closer to described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, deduct the actual relative distance that prescan position starts between scanning position and primary standard substance, to obtain the distance that prescan position starts between scanning position and x-ray system;
When prescan position start scanning position than primary standard substance further from described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, add that prescan position starts the actual relative distance between scanning position and primary standard substance, to obtain the distance that prescan position starts between scanning position and x-ray system;
When prescan position terminate scanning position than primary standard substance closer to described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, deduct the actual relative distance that prescan position is terminated between scanning position and primary standard substance, to obtain the distance that prescan position is terminated between scanning position and x-ray system;
When prescan position terminate scanning position than primary standard substance further from described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, add that the actual relative distance between scanning position and primary standard substance is terminated at prescan position, to obtain the distance that prescan position is terminated between scanning position and x-ray system.
Alternatively, described electronic photo shows two or more prescan positions.
Compared with prior art, the present invention has the following advantages:
When utilizing CT or PET-CT system provided by the present invention to position, first utilize imaging device to obtain electronic photo, electronic photo not only shows the prescan position of patient, the position corresponding to primary standard substance can also be found on electronic photo, scanning position is started according to prescan position on electronic photo, scanning position is terminated at prescan position, relative distance between primary standard substance, and the enlargement ratio of imaging device, prescan position can be obtained and start scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance, and distance between primary standard substance and x-ray system is known, thus can determine that prescan position starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, control examinating couch moves this distance and can realize carrying out CT scan to the prescan position of patient, thus X-radiation can not be subject to, decrease the healthy hidden danger of patient.
In addition, existing CT or PET-CT system carries out often needing in the localization method scanned to make examinating couch move a very long time, scan to obtain spacer to patient in the moving process of examinating couch, just can learn that examinating couch starts scanning position parameter and examinating couch terminates scanning position parameter according to spacer, make positioning time long, and patient's examinating couch when utilizing CT or PET-CT system provided by the present invention to position keeps motionless, by taking pictures, the beginning scanning position of examinating couch and the end scanning position of examinating couch just can be learnt after measuring electronic photo and calculating, shorten positioning time.
Accompanying drawing explanation
Fig. 1 is that existing CT or PET-CT system carries out utilizing spacer to obtain the schematic diagram of patient's prescan position sweep limits in the localization method scanned;
Fig. 2 is the structural representation of a kind of CT or PET-CT system mid frame and examinating couch;
Fig. 3 is the front view of CT or PET-CT system in embodiments of the invention one;
Fig. 4 is the left view of CT or PET-CT system in embodiments of the invention one;
Fig. 5 is the top view of CT or PET-CT system in embodiments of the invention one;
Fig. 6 is the schematic diagram utilizing electronic photo to obtain patient's prescan position sweep limits in embodiments of the invention one;
Fig. 7 is the top view of CT or PET-CT system in embodiments of the invention two;
Fig. 8 is the left view of CT or PET-CT system in embodiments of the invention two;
Fig. 9 is the schematic diagram utilizing electronic photo to obtain patient's prescan position sweep limits in embodiments of the invention two.
Detailed description of the invention
Below in conjunction with accompanying drawing, by specific embodiment, carry out clear, complete description to technical scheme of the present invention, obviously, described embodiment is only a part for embodiment of the present invention, instead of they are whole.According to these embodiments, those of ordinary skill in the art's obtainable other embodiments all under without the need to the prerequisite of creative work, all belong to protection scope of the present invention.
Embodiment one
Fig. 2 is the structural representation of a kind of CT or PET-CT system mid frame and examinating couch, as shown in Figure 2, CT or PET-CT system 100 comprises frame 110 and examinating couch 120, and frame 110 has the Z axis being parallel to coordinate system around system axis S() the rotatable part 130 that rotates.Rotatable part 130 comprises the x-ray system with x-ray source 131 and X-ray detector 132.Rotatable part 130 has central point O, and central point O is positioned on system axis S, and x-ray system can rotate around central point O.
Fig. 3 is the front view (view along Y direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention one, Fig. 4 is the left view (view along Z-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention one, Fig. 5 is the top view (view along X-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention one, shown in composition graphs 3 to Fig. 5, CT or PET-CT system 100 in the present invention also comprises the imaging device 150 for obtaining the electronic photo showing patient's prescan position, as a specific embodiment, imaging device 150 is arranged on (as shown in Figures 3 to 5) or side (as shown in Figures 7 and 8) above examinating couch 120.As a specific embodiment, imaging device 150 can be photographic head or photographing unit.Certainly, imaging device 150 also can be that other has the electronic equipment of camera function, and such as, notebook computer, computer etc. all have camera function.Imaging device 150 has optical center line 151, and optical center line 151 is perpendicular to subject.When above imaging device 150 is arranged on examinating couch 120, imaging device 150 can drop on examinating couch 120 along the projection of X-direction in coordinate system, and optical center line 151 is parallel to the X-axis of coordinate system, and can take the direct picture of patient.When imaging device 150 is arranged on side (composition graphs 7 and Fig. 8 shown in) of examinating couch 120, imaging device 150 can not drop on examinating couch 120 along the projection of X-direction in coordinate system, optical center line 151 is parallel to the Y-axis of coordinate system, and the side image of patient can be taken, when imaging device 150 is arranged on some height, imaging device 150 not only can take the side image of patient, can also take the direct picture of patient.According to the difference at patient's prescan position, can imaging device 150 be optionally arranged on above examinating couch or examinating couch side, to ensure that captured electronic photo clearly can demonstrate the prescan position of patient, so that doctor can find out the beginning scanning position at patient's prescan position accurately and terminate scanning position on electronic photo.
After imaging device 150 installation, when not changing imaging device 150 and arranging, the enlargement ratio of imaging device 150 is fixed value.Described enlargement ratio refer to object to utilize in photo captured by imaging device become the ratio of the size of image and the actual size of object.After imaging device 150 installation, the horizontal range L1 between imaging device optical center line 151 and x-ray system is fixed value.Horizontal range L1 between imaging device optical center line 151 and x-ray system refers to: imaging device optical center line 151 and x-ray system rotate around central point O between horizontal range.
CT or PET-CT system 100 also comprises the primary standard substance that there is interval between x-ray system, and in the present embodiment, described primary standard substance is imaging device optical center line 151.In this case, namely distance between primary standard substance and x-ray system refers to the horizontal range L1 between imaging device optical center line 151 and x-ray system, shown in composition graphs 6, visually do corresponding on electronic photo 170 of imaging device optical center line 151 and be imaged as electronic photo central point 171.
CT or PET-CT system 100 also comprises: for obtaining the distance that prescan position starts between scanning position and x-ray system, and the picture processing device 160 of the distance between scanning position and x-ray system is terminated at prescan position.Picture processing device 160 comprises: photo measuring unit, it is for showing electronic photo 170 captured by imaging device 150, and scanning position is started to prescan position in electronic photo 170, relative distance that prescan position is terminated between scanning position, primary standard substance measures, utilize after photo measuring unit measures the size of specific part on electronic photo, just will can know the full-size(d) size of specific part after the enlargement ratio of measurement size divided by imaging device 150; Computing unit, the relative distance that it starts scanning position for prescan position in the electronic photo 170 that obtains according to photo measuring unit, prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, the actual range between primary standard substance and x-ray system, obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
As a specific embodiment, picture processing device 160 is computer, in this case, described photo disposal unit is that the photo be arranged in picture processing device 160 shows and processing module, this module can display photos comparison film be measured, computing unit is the computing module be arranged in picture processing device 160, and this module can realize computing function according to specific calculation formula.As a specific embodiment, the display of described photo and processing module are be arranged on PHOTOSHOP software in picture processing device 160 or ACDSee software, and described computing module is the software with specific calculation formula be arranged in picture processing device 160.
In one embodiment, CT or PET-CT system 100 also comprises: the imaging device control device be connected with imaging device 150, imaging device control device may be controlled to unlatching or the cut out of picture equipment 150, such as, preparation utilize CT or PET-CT system 100 carry out Scan orientation before by imaging device control device, imaging device 150 can be opened, utilize CT or PET-CT system 100 complete Scan orientation after by imaging device control device, imaging device 150 can cut out.As a specific embodiment, imaging device control device is a computer, and imaging device control device is connected with picture processing device 160.
In one embodiment, CT or PET-CT system 100 also comprises: for ordering about the horizontal movement device (not shown) that examinating couch 120 is done to move horizontally, and the movement travel needed for examinating couch 120 can select suitable horizontal movement device; For the horizontal movement device control device 140 of level of control telecontrol equipment motion, and horizontal movement device control device 140 can Real-time Obtaining examinating couch location parameter.As a specific embodiment, horizontal movement device control device 140 is a computer.
As a specific embodiment, imaging device control device is a computer, photo measuring unit is a computer, photo disposal software is installed in this computer, computing unit is a computer, horizontal movement device control device 140 is a computer, imaging device control device is connected with photo measuring unit, photo measuring unit is connected with computing unit, computing unit is connected with horizontal movement device control device 140, after imaging device control device control imaging device obtains electronic photo, electronic photo is transferred to photo measuring unit, utilize after the specific part of photo disposal software to electronic photo in photo measuring unit measure, measurement result is transferred to computing unit, the distance that computing unit utilizes specific computing formula to calculate patient's prescan position to start between scanning position and x-ray system according to measurement result, and the distance between scanning position and x-ray system is terminated at patient's prescan position.Computing unit obtains the distance that patient's prescan position starts between scanning position and x-ray system, and after patient's prescan position terminates the distance between scanning position and x-ray system, send the instruction driving horizontal movement device setting in motion to horizontal movement device control device 140, horizontal movement device control device 140 receives the motion of this instruction rear drive horizontal movement device.
In other embodiments, also can wherein two or more in imaging device control device, photo measuring unit, computing unit, horizontal movement device control device 140 be integrated in a computer, as long as guarantee to realize respective function, above-described embodiment can not be confined to.
As a specific embodiment, integrated greatly in order to realize CT or PET-CT system 100, and the electricity being convenient to CT or PET-CT system 100 controls, in CT or PET-CT system 100, picture processing device 160 is computer, described photo measuring unit is that the photo be arranged in picture processing device 160 shows and processing module, this photo shows and processing module can show display photos and comparison film is measured, described computing unit is the computing module be arranged in picture processing device 160, this computing module can realize computing function according to specific computing formula, imaging device control device is the control module be arranged in picture processing device 160, in other words, imaging device control device is integrated in picture processing device 160, horizontal movement device control device 140 is computer.Like this, picture processing device 160 can be connected with imaging device 150, at this moment, picture processing device 160 directly can be used as imaging device control device, to control unlatching or the closedown of imaging device 150, horizontal movement device control device 140 is connected with picture processing device 160, like this, picture processing device 160 controls after imaging device 150 obtains electronic photo, the photo measuring unit in picture processing device 160 can be directly utilized to show described electronic photo, and measure the size of specific part in electronic photo, computing unit in picture processing device 160 is directly according to the distance that this size utilizes specific computing formula to obtain patient's prescan position to start between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at patient's prescan position, the picture processing device 160 and the horizontal movement device control device 140 that are connected can carry out on-line operation, once picture processing device 160 obtains the distance that patient's prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at patient's prescan position, horizontal movement device control device 140 just drives horizontal movement device motion at once.
Based on CT or the PET-CT system in above-described embodiment, continue, with reference to shown in Fig. 3 to Fig. 6, to the invention provides the localization method that a kind of CT or PET-CT system carries out scanning.
Utilizing before CT or PET-CT system positions, should guarantee that imaging device 150 can obtain clear photograph.
First, patient utilizes imaging device control device to open imaging device 150, takes pictures and obtain electronic photo to patient after lying low on examinating couch 120 with correct posture.Because the areas imaging of imaging device 150 is comparatively large, electronic photo can demonstrate the complete image of patient, comprises the image at patient's prescan position.
Then, picture processing device 160 pairs of electronic photos 170 are utilized to process, to obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, comprises the step that electronic photo 170 processes:
Utilize photo measuring unit to show electronic photo 170, and scanning position is started to prescan position in electronic photo 170, relative distance that prescan position is terminated between scanning position, primary standard substance measures;
Start scanning position according to prescan position on measured electronic photo 170, relative distance that prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance (being imaging device optical center line 151);
In conjunction with the actual range (being the horizontal range L1 between imaging device centrage 151 and x-ray system) between primary standard substance and x-ray system, computing unit calculates the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
As a specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 6, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, and electronic photo central point 171, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the first labelling M1 and electronic photo central point 171 and the distance between the second labelling M2 and electronic photo central point 171.Then, utilize computing unit by the enlargement ratio of the distance between the first labelling M1 and electronic photo central point 171 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance and imaging device optical center line 151; Utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and electronic photo central point 171 divided by imaging device, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance and imaging device optical center line 151.
As another one specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 6, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, and electronic photo central point 171, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the first labelling M1 and electronic photo central point 171 and the distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the enlargement ratio of the distance between the first labelling M1 and electronic photo central point 171 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance and imaging device optical center line 151; Utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and the first labelling M1 divided by imaging device, add the actual range that prescan position starts between scanning position and primary standard substance and imaging device optical center line 151, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance and imaging device optical center line 151.
As another one specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 6, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, and electronic photo central point 171, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the second labelling M2 and electronic photo central point 171 and the distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and electronic photo central point 171 divided by imaging device, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance and imaging device optical center line 151; Utilize the actual range that prescan position is terminated between scanning position and primary standard substance and imaging device optical center line 151 by computing unit, deduct the enlargement ratio of the distance between the second labelling M2 and the first labelling M1 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance and imaging device optical center line 151.
When prescan position starts scanning position than primary standard substance and imaging device optical center line 151 closer to x-ray system (prescan position starts the right side that scanning position is positioned at imaging device optical center line 151 in Figure 5 in this case), then prescan position starts the distance between scanning position and x-ray system and is: by the horizontal range L1 between imaging device centrage 151 and x-ray system, deducts the actual range (namely on electronic photo 170, prescan position starts the distance of scanning position and electronic photo central point 171 divided by imaging device enlargement ratio) that prescan position starts between scanning position and primary standard substance.When prescan position starts scanning position than primary standard substance and imaging device optical center line 151 further from x-ray system (prescan position starts the left side that scanning position is positioned at imaging device optical center line 151 in Figure 5 in this case), then prescan position starts the distance between scanning position and x-ray system and is: by the horizontal range L1 between imaging device centrage 151 and x-ray system, add that prescan position starts the actual range (namely on electronic photo 170, prescan position starts the distance of scanning position and electronic photo central point 171 divided by imaging device enlargement ratio) between scanning position and primary standard substance.
In like manner, when scanning position is terminated than primary standard substance and imaging device optical center line 151 closer to x-ray system (right side that scanning position is positioned at imaging device optical center line 151 is terminated at prescan position in Figure 5 in this case) in prescan position, then prescan position is terminated the distance between scanning position and x-ray system and is: by the horizontal range L1 between imaging device centrage 151 and x-ray system, deduct the actual range (namely on electronic photo 170, the distance of scanning position and electronic photo central point 171 is terminated divided by imaging device enlargement ratio in prescan position) that prescan position is terminated between scanning position and primary standard substance.When scanning position is terminated than primary standard substance and imaging device optical center line 151 further from x-ray system (left side that scanning position is positioned at imaging device optical center line 151 is terminated at prescan position in Figure 5 in this case) in prescan position, then prescan position is terminated the distance between scanning position and x-ray system and is: by the horizontal range L1 between imaging device centrage 151 and x-ray system, add that the actual range (namely on electronic photo 170, the distance of scanning position and electronic photo central point 171 is terminated divided by imaging device enlargement ratio in prescan position) between scanning position and primary standard substance is terminated at prescan position.
Acquisition patient's prescan position starts the distance between scanning position and x-ray system, and after patient's prescan position terminates the distance between scanning position and x-ray system, the horizontal movement device that horizontal movement device control device 140 controls examinating couch is started working, moved towards near the direction of x-ray system in the prescan position of patient, when know according to horizontal movement device control device 140 displacement of examinating couch be patient's prescan position start between scanning position and x-ray system distance time start CT scan, and control examinating couch moves always, until according to horizontal movement device control device 140 know the displacement of examinating couch be patient's prescan position terminate between scanning position and x-ray system distance time stop CT scan.
As a specific embodiment, before examinating couch moves, horizontal movement device control device 140 is utilized to obtain the current location parameter of examinating couch, because patient's prescan position starts the distance between scanning position and x-ray system, and the distance that patient's prescan position is terminated between scanning position and x-ray system is known, therefore, location parameter when can obtain location parameter when starting CT scan corresponding to examinating couch and terminate CT scan corresponding to examinating couch, like this, can according to the location parameter of horizontal movement device control device 140 Real-time Obtaining examinating couch, when detecting that the location parameter of examinating couch is for starting CT scan when starting the location parameter corresponding to CT scan, until when the location parameter of examinating couch is for stopping CT scan when terminating the location parameter corresponding to CT scan.As a specific embodiment, examinating couch location parameter corresponding when the movement travel of examinating couch can be made minimum is as the current location parameter of examinating couch described in the present invention, like this, before positioning at every turn, the movement travel of examinating couch is set to minima, then take pictures, then calculate examinating couch and start scanning position parameter and examinating couch terminates scanning position parameter.
As a specific embodiment, as shown in Figures 3 to 5, imaging device 150 just in time can be arranged on the top of examinating couch 120 center.As another specific embodiment, as shown in Figures 7 and 8, imaging device 150 is arranged on the side of examinating couch 120, and imaging device optical center line 151 is parallel to coordinate system Y-axis and hands over system axis S-phase.
In actual applications, sometimes need to scan multiple specific paries of patient simultaneously, at this moment need to calculate respectively the distance that each prescan position starts distance between scanning position and x-ray system and prescan position to terminate between scanning position and x-ray system.
From the above, the present invention first obtained primary standard substance and the distance between imaging device optical center line and x-ray system before carrying out CT scan to patient, then imaging device is utilized to take pictures to patient, the electronic photo obtained shows patient's prescan position, utilize photo measuring unit to measure prescan position on electronic photo and start scanning position, scanning position is terminated at prescan position, relative distance between primary standard substance, enlargement ratio in conjunction with imaging device can obtain prescan position and start scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance, and primary standard substance and the horizontal range between imaging device optical center line and x-ray system known, therefore the actual range between the beginning scanning position at patient's prescan position and x-ray system can be known, and the actual range between the end scanning position at patient's prescan position and x-ray system, then, examinating couch is driven to start mobile, CT scan can be started when the displacement of examinating couch is the actual range between the beginning scanning position at patient's prescan position and x-ray system, until terminate CT scan when the displacement of examinating couch is the actual range between the end scanning position at patient's prescan position and x-ray system.
Compared with carrying out with existing CT or PET-CT system the localization method that scans, when utilizing CT or PET-CT system provided by the present invention to position, first utilize imaging device to obtain electronic photo, electronic photo not only shows the prescan position of patient, the position corresponding to primary standard substance can also be found on electronic photo, scanning position is started according to prescan position on electronic photo, scanning position is terminated at prescan position, relative distance between primary standard substance, and the enlargement ratio of imaging device, prescan position can be obtained and start scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance, and distance between primary standard substance and x-ray system is known, thus can determine that prescan position starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, control examinating couch moves this distance and can realize carrying out CT scan to the prescan position of patient, thus X-radiation can not be subject to, decrease the healthy hidden danger of patient.
In addition, existing CT or PET-CT system carries out often needing in the localization method scanned to make examinating couch move a very long time, scan to obtain spacer to patient in the moving process of examinating couch, just can learn that examinating couch starts scanning position parameter and examinating couch terminates scanning position parameter according to spacer, make positioning time long, and patient's examinating couch when utilizing CT or PET-CT system provided by the present invention to position keeps motionless, by taking pictures, the beginning scanning position of examinating couch and the end scanning position of examinating couch just can be learnt after measuring electronic photo and calculating, shorten positioning time.
Embodiment two
Fig. 7 is the top view (view along X-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention two, Fig. 8 is the left view (view along Z-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention two, Fig. 7, Fig. 8 and Fig. 3, Fig. 4 is more known, in embodiment two, in CT or PET-CT system and embodiment one, the difference of CT or PET-CT system is: primary standard substance 180 is for being fixedly installed on projection, groove, the printed patterns on examinating couch 120, instead of imaging device optical center line 151.As a specific embodiment, primary standard substance 180 is rectangular cam, rectangular recess or rectangle printed patterns.Certainly, primary standard substance 180 is not limited only to above-described embodiment, as long as ensure that the primary standard substance 180 on electronic photo can show clearly.When the position of examinating couch 120 maintains static, the distance L2 between primary standard substance 180 and x-ray system is fixed value.Distance L2 between primary standard substance 180 and x-ray system refers to: x-ray system rotate around central point O along the horizontal range between the projection of X-direction on examinating couch 120 and primary standard substance 180.
Based on this CT or PET-CT system, the invention provides the localization method that this CT or PET-CT system carries out scanning.
Utilizing before CT or PET-CT system carries out Scan orientation, should guarantee that imaging device 150 can obtain clear photograph.
First, patient utilizes imaging device control device to open imaging device 150, takes pictures and obtain electronic photo to patient after lying low on examinating couch 120 with correct posture.Because the areas imaging of imaging device 150 is comparatively large, electronic photo can demonstrate the complete image of patient, comprises the image at patient's prescan position and the image 181 of primary standard substance 180.
Then, picture processing device 160 pairs of electronic photos 170 are utilized to process, to obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, comprises the step that electronic photo 170 processes:
Utilize photo measuring unit to show electronic photo 170, and scanning position is started to prescan position in electronic photo 170, scanning position is terminated at prescan position, relative distance between primary standard substance (i.e. primary standard substance image 181) is measured;
Start scanning position according to prescan position on measured electronic photo 170, relative distance that prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance 180;
In conjunction with the actual range (being the distance L2 between primary standard substance 180 and x-ray system) between primary standard substance 180 and x-ray system, computing unit calculates the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
As a specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 9, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the first labelling M1 and primary standard substance image 181 and the distance between the second labelling M2 and primary standard substance image 181.Then, utilize computing unit by the enlargement ratio of the distance between the first labelling M1 and primary standard substance image 181 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance 180; Utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and primary standard substance image 181 divided by imaging device, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance 180.
As another one specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 9, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the first labelling M1 and primary standard substance image 181 and the distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the enlargement ratio of the distance between the first labelling M1 and primary standard substance image 181 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance 180; Utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and the first labelling M1 divided by imaging device, add the actual range that prescan position starts between scanning position and primary standard substance 180, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance 180.
As another one specific embodiment, photo measuring unit is utilized to show the electronic photo 170 shown in Fig. 9, electronic photo 170 is determined the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, scanning position is started to patient's prescan position and makes the first labelling M1, scanning position is terminated to patient's prescan position and makes the second labelling M2, preferably, first labelling M1 and the second labelling M2 is straight line, and the first labelling M1 and the second labelling M2 is parallel to the Y-axis of coordinate system.Then, photo measuring unit is utilized to measure distance between the second labelling M2 and primary standard substance image 181 and the distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the enlargement ratio of the distance between the second labelling M2 and primary standard substance image 181 divided by imaging device, to obtain the actual range that prescan position is terminated between scanning position and primary standard substance 180; Utilize computing unit that the actual range between scanning position and primary standard substance 180 is terminated at prescan position, deduct the enlargement ratio of the distance between the second labelling M2 and the first labelling M1 divided by imaging device, to obtain the actual range that prescan position starts between scanning position and primary standard substance 180.
When prescan position starts scanning position than primary standard substance 180 closer to x-ray system (prescan position starts the upside that scanning position is positioned at primary standard substance 180 in the figure 7 in this case), then prescan position starts the distance between scanning position and x-ray system and is: by the distance L2 between primary standard substance 180 and x-ray system, deducts the actual range (namely on electronic photo 170, prescan position starts the distance of scanning position and primary standard substance image 181 divided by imaging device enlargement ratio) that prescan position starts between scanning position and primary standard substance 180.When prescan position starts scanning position than primary standard substance 180 further from x-ray system (prescan position starts the downside that scanning position is positioned at imaging device optical center line 151 in the figure 7 in this case), then prescan position starts the distance between scanning position and x-ray system and is: by the distance L2 between primary standard substance 180 and x-ray system, add that prescan position starts the actual range (namely on electronic photo 170, prescan position starts the distance of scanning position and primary standard substance image 181 divided by imaging device enlargement ratio) between scanning position and primary standard substance 180.
In like manner, when scanning position is terminated than primary standard substance 180 closer to x-ray system (upside that scanning position is positioned at primary standard substance 180 is terminated at prescan position in the figure 7 in this case) in prescan position, then prescan position is terminated the distance between scanning position and x-ray system and is: by the distance L2 between primary standard substance 180 and x-ray system, deducts the actual range (namely on electronic photo 170, the distance of scanning position and primary standard substance image 181 is terminated divided by imaging device enlargement ratio in prescan position) that prescan position is terminated between scanning position and primary standard substance 180.When scanning position is terminated than primary standard substance 180 further from x-ray system (downside that scanning position is positioned at imaging device optical center line 151 is terminated at prescan position in the figure 7 in this case) in prescan position, then prescan position is terminated the distance between scanning position and x-ray system and is: by the distance L2 between primary standard substance 180 and x-ray system, add that the actual range (namely on electronic photo 170, the distance of scanning position and primary standard substance image 181 is terminated divided by imaging device enlargement ratio in prescan position) between scanning position and primary standard substance 180 is terminated at prescan position.
From the above, the present invention first obtained primary standard substance and is namely arranged on projection on examinating couch before carrying out CT scan to patient, groove or the distance between printed patterns and x-ray system, then imaging device is utilized to take pictures to patient, the electronic photo obtained shows patient's prescan position and primary standard substance image, utilize photo measuring unit to measure prescan position on electronic photo and start scanning position, scanning position is terminated at prescan position, relative distance between primary standard substance, enlargement ratio in conjunction with imaging device can obtain prescan position and start scanning position, scanning position is terminated at prescan position, actual relative distance between primary standard substance, and horizontal range between primary standard substance and x-ray system is known, therefore the actual range between the beginning scanning position at patient's prescan position and x-ray system can be known, and the actual range between the end scanning position at patient's prescan position and x-ray system, then, examinating couch is driven to start mobile, CT scan can be started when the displacement of examinating couch is the actual range between the beginning scanning position at patient's prescan position and x-ray system, until terminate CT scan when the displacement of examinating couch is the actual range between the end scanning position at patient's prescan position and x-ray system.
It should be noted that, primary standard substance described in the present invention only can not be confined to above-described embodiment, and namely described primary standard substance is also only confined to imaging device optical center line or is fixedly installed on projection, groove, the printed patterns on examinating couch.In other embodiments, primary standard substance also can be arranged in other forms, as long as when taking pictures, this primary standard substance can be presented on electronic photo together with the prescan position of patient, and can know the distance between primary standard substance and x-ray system, do not enumerate at this.
Above by the explanation of embodiment, professional and technical personnel in the field should be able to be made to understand the present invention better, and can reproduce and use the present invention.Those skilled in the art can be apparent to above-described embodiment do various changes and modifications when not departing from the spirit and scope of the invention according to principle described herein.Therefore, the present invention should not be understood to be limited to above-described embodiment shown in this article, and its protection domain should be defined by appending claims.
Claims (12)
1. a CT or PET-CT system, is characterized in that, comprising:
Examinating couch;
Comprise the x-ray system of x-ray source and X-ray detector;
And there is the primary standard substance at interval between described x-ray system;
For obtaining the imaging device of the electronic photo showing patient's prescan position;
Picture processing device, for obtaining the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, and described picture processing device comprises:
Photo measuring unit, for showing electronic photo captured by described imaging device, and scanning position is started to prescan position in described electronic photo, prescan position to terminate in scanning position, primary standard substance relative distance between the two arbitrarily and measures;
Computing unit, start scanning position for prescan position in the electronic photo that obtains according to described photo measuring unit, prescan position to terminate in scanning position, primary standard substance relative distance between the two arbitrarily, and the enlargement ratio of imaging device, the actual range between primary standard substance and x-ray system, obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
2. CT or PET-CT system according to claim 1, is characterized in that, described imaging device is photographing unit or photographic head.
3. CT or PET-CT system according to claim 1, is characterized in that, described imaging device is arranged on above described examinating couch or side.
4. CT or PET-CT system according to claim 1, is characterized in that, described primary standard substance is imaging device optical center line; Or described primary standard substance is the projection, groove, the printed patterns that are fixedly installed on described examinating couch.
5. CT or the PET-CT system according to any one of Claims 1-4, is characterized in that, described picture processing device is computer, and described photo measuring unit is that the photo be arranged in described picture processing device shows and processing module.
6. CT or PET-CT system according to claim 1, is characterized in that, also comprises the imaging device control device be connected with described imaging device.
7. CT or PET-CT system according to claim 5, is characterized in that, described picture processing device is connected with described imaging device.
8. CT or PET-CT system according to claim 5, it is characterized in that, also comprise the horizontal movement device doing to move horizontally for ordering about described examinating couch, and for controlling the motion of described horizontal movement device, and being suitable for the horizontal movement device control device of Real-time Obtaining examinating couch location parameter, described horizontal movement device control device is connected with described picture processing device.
9. CT or PET-CT system according to claim 8, is characterized in that, described horizontal movement device control device is computer.
10. as described in any one of claim 1 to 9, CT or PET-CT system carries out the localization method scanned, and it is characterized in that, comprising:
Patient lies low after on examinating couch, and imaging device obtains the electronic photo showing patient's prescan position;
Picture processing device is utilized to process described electronic photo, to obtain the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position, the step that described electronic photo processes is comprised:
Utilize photo measuring unit to show described electronic photo, and scanning position is started to prescan position in described electronic photo, relative distance that prescan position is terminated between scanning position, primary standard substance measures;
Start scanning position according to prescan position on measured electronic photo, relative distance that prescan position is terminated between scanning position, primary standard substance, and the enlargement ratio of imaging device, the actual relative distance that computing unit calculates that prescan position starts scanning position, prescan position is terminated between scanning position, primary standard substance;
In conjunction with the actual range between primary standard substance and x-ray system, computing unit calculates the distance that prescan position starts between scanning position and x-ray system, and the distance between scanning position and x-ray system is terminated at prescan position.
11. CT or PET-CT systems according to claim 10 carry out the localization method scanned, and it is characterized in that, comprise the step that described electronic photo processes:
Utilize photo measuring unit to show described electronic photo, and the relative distance that prescan position in described electronic photo starts relative distance between scanning position and primary standard substance and prescan position to terminate between scanning position and primary standard substance is measured;
Prescan position in measured electronic photo is started the enlargement ratio of the relative distance between scanning position and primary standard substance divided by imaging device by computing unit, to obtain the actual relative distance that prescan position starts between scanning position and primary standard substance, the enlargement ratio of the relative distance between scanning position and primary standard substance divided by imaging device is terminated at prescan position in measured electronic photo, to obtain the actual relative distance that prescan position is terminated between scanning position and primary standard substance;
When prescan position start scanning position than primary standard substance closer to described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, deduct the actual relative distance that prescan position starts between scanning position and primary standard substance, to obtain the distance that prescan position starts between scanning position and x-ray system;
When prescan position start scanning position than primary standard substance further from described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, add that prescan position starts the actual relative distance between scanning position and primary standard substance, to obtain the distance that prescan position starts between scanning position and x-ray system;
When prescan position terminate scanning position than primary standard substance closer to described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, deduct the actual relative distance that prescan position is terminated between scanning position and primary standard substance, to obtain the distance that prescan position is terminated between scanning position and x-ray system;
When prescan position terminate scanning position than primary standard substance further from described x-ray system time, computing unit is by the actual range between primary standard substance and x-ray system, add that the actual relative distance between scanning position and primary standard substance is terminated at prescan position, to obtain the distance that prescan position is terminated between scanning position and x-ray system.
12. CT or PET-CT systems according to claim 10 carry out the localization method scanned, and it is characterized in that, described electronic photo show two or more prescan positions.
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