CN103767722A - CT or PET-CT system and positioning method for conducting scanning through same - Google Patents
CT or PET-CT system and positioning method for conducting scanning through same Download PDFInfo
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- CN103767722A CN103767722A CN201210411250.5A CN201210411250A CN103767722A CN 103767722 A CN103767722 A CN 103767722A CN 201210411250 A CN201210411250 A CN 201210411250A CN 103767722 A CN103767722 A CN 103767722A
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Abstract
The invention discloses a CT or PET-CT system and a positioning method for conducting scanning through the CT or PET-CT system. The CT or PET-CT system comprises an imaging device and a picture processing device. A patient can not suffer X-ray radiation when positioning is conducted through the CT or PET-CT system, and potential health hazards of the patient are reduced. In addition, in a positioning method for conducting scanning through an existing CT or PET-CT system, an examining table is usually required to move for a quite long time, the examining table scans the patient in the moving process to obtain locating plates, and subsequent examining can be further scheduled only according to the locating plates, and the positioning method mainly includes the steps of obtaining scanning a starting position parameter of the examining table and a scanning stopping position parameter of the examining table. However, by means of the positioning method for conducting scanning through the existing CT or PET-CT system, positioning time is too long. The examining table is kept still when positioning is conducted through the CT or PET-CT system, the scanning starting position of the examining table and the scanning stopping position of the examining table can be known by taking pictures, measuring the electronic pictures and conducting calculation, and positioning time is shortened.
Description
Technical field
The present invention relates to computed tomography (Computed Tomography, be called for short CT) technology, particularly relate to a kind of CT or PET-CT(positron emission tomography-Computed Tomography, positron emission tomography scanning) localization method that scans of system and a kind of CT or PET-CT system.
Background technology
Computed tomography is with X ray, the specific part of human body to be scanned by certain thickness aspect, and in the time of 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 difference of the various tissues of human body, the penetration capacity difference of X ray, so the ray that detector receives has just had difference.After changing received this discrepant ray signal into digital information, processed by computer, and form and can, at the image of fluorescence screen display, can find the tiny pathological changes at any position in body according to this image.PET-CT organically combines PET and CT, uses same examinating couch and same image processing workstation, by PET image and CT image co-registration, to reflect pathophysiological change and the morphosis of focus simultaneously, has improved the accuracy of diagnosis.
Before human body specific part being scanned in CT system or PET-CT system, in order to facilitate doctor can accurately define the scope that human body need scan, first need to position scanning, can obtain spacer (topogramm) through location scanning.Spacer is the preliminary image obtaining before carrying out main tomoscan, it refers to that the angle (normotopia or side position) that x-ray source is placed in to requirement maintains static, and automatically patient is sent in frame and carries out the spacer of the similar x-ray plain film of a series of X ray exposure gained with implantation.Operator can select according to spacer the angle of rack inclining, and can on spacer, mark beginning scanning position, the end scanning position at prescan position, the angle bed thickness at prescan position with reference line, then, can only scan the specific part of human body according to the labelling made from reference line on spacer.
Particularly, the localization method that CT system or PET-CT system scan comprises the following steps: after patient lies low on examinating couch, control examinating couch and move a segment distance, in examinating couch moving process, carry out CT scan, obtain spacer as shown in Figure 1, on spacer, show location picture, on 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 location picture, mark the beginning scanning position at prescan position and the end scanning position at prescan position with reference line, can know on computers the beginning scanning position parameter (unit is pixel) at prescan position and the end scanning position parameter (unit is pixel) at prescan position, the corresponding examinating couch of beginning scanning position that can know prescan position according to computing formula (1) starts scanning position parameter, can know that the corresponding examinating couch of end scanning position at prescan position finishes scanning position parameter according to computing formula (2).
(the starting position parameter of the end position parameter-examinating couch of examinating couch): (the starting position parameter of 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 parameter-location, starting position picture of location picture) (1)
(the starting position parameter of the end position parameter-examinating couch of examinating couch): (the starting position parameter of end position parameter-location picture of location picture)=(the starting position parameter-examinating couch of examinating couch finishes scanning position parameter): (the end scanning position parameter of parameter-location, starting position picture of location picture) (2)
Know that examinating couch starts after scanning position and examinating couch finish 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, thereby can obtain the CT image of human body specific part.
But, in the localization method that above-mentioned CT system or PET-CT system scan, often need to make examinating couch move a very long time, in the moving process of examinating couch, patient is scanned to obtain spacer, just can learn that according to spacer examinating couch starts scanning position parameter and examinating couch finishes scanning position parameter, not only make positioning time long, also can make patient be subject to a lot of X-radiations.
Summary of the invention
The object of the invention is to solve the problem that while 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 between described x-ray system, there is the primary standard substance at interval;
For obtaining the imaging device of the electronic photo that shows patient's prescan position;
Picture processing device, starts the distance between scanning position and x-ray system for obtaining prescan position, and prescan position finishes the distance between scanning position and x-ray system, and described picture processing device comprises:
Photo measuring unit, for showing the captured electronic photo of described imaging device, and starts to prescan position in described electronic photo the relative distance that scanning position, prescan position finish between scanning position, primary standard substance and measures;
Computing unit, the electronic photo prescan position that is used for obtaining according to described photo measuring unit starts scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and actual range between the enlargement ratio of imaging device, primary standard substance and x-ray system, obtain prescan position and start the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
Alternatively, described imaging device is photographing unit or photographic head.
Alternatively, described imaging device is arranged on described examinating couch top or side.
Alternatively, described primary standard substance is imaging device optical center line; Or described primary standard substance is projection, groove, the printed patterns being 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, also comprise the imaging device control device being connected with described imaging device.
Alternatively, described picture processing device is connected with described imaging device.
Alternatively, also comprise for ordering about described examinating couch and make the horizontal movement device moving horizontally, and for controlling described horizontal movement device motion, 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, the localization method that the present invention also provides a kind of above-mentioned CT or PET-CT system to scan, it comprises:
After patient lies low on examinating couch, imaging device obtains the electronic photo that shows patient's prescan position;
Utilize picture processing device to process described electronic photo, start the distance between scanning position and x-ray system to obtain prescan position, and prescan position finishes the distance between scanning position and x-ray system, the step that described electronic photo is processed comprises:
Utilize photo measuring unit to show described electronic photo, and prescan position in described electronic photo is started to the relative distance that scanning position, prescan position finish between scanning position, primary standard substance measure;
According to prescan position on measured electronic photo start scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, the actual relative distance between scanning position, primary standard substance is finished at prescan position;
In conjunction with the actual range between primary standard substance and x-ray system, computing unit calculates prescan position and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
Alternatively, the step of described electronic photo being processed comprises:
Utilize photo measuring unit to show described electronic photo, and the relative distance that prescan position in described electronic photo is started relative distance between scanning position and primary standard substance and prescan position to finish between scanning position and primary standard substance is measured;
Prescan position in measured electronic photo is started relative distance between scanning position and the primary standard substance enlargement ratio divided by imaging device by computing unit, start the actual relative distance between scanning position and primary standard substance to obtain prescan position, relative distance between scanning position and the primary standard substance enlargement ratio divided by imaging device is finished in prescan position in measured electronic photo, finish the actual relative distance between scanning position and primary standard substance to obtain prescan position;
When prescan position starts scanning position than primary standard substance when more close described x-ray system, computing unit is by the actual range between primary standard substance and x-ray system, deduct prescan position and start the actual relative distance between scanning position and primary standard substance, start the distance between scanning position and x-ray system to obtain prescan position;
When prescan position starts scanning position than primary standard substance during further from described x-ray system, 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, start the distance between scanning position and x-ray system to obtain prescan position;
When scanning position is finished than primary standard substance when more close described x-ray system in prescan position, computing unit is by the actual range between primary standard substance and x-ray system, deduct prescan position and finish the actual relative distance between scanning position and primary standard substance, finish the distance between scanning position and x-ray system to obtain prescan position;
When scanning position is finished than primary standard substance during further from described x-ray system in prescan position, computing unit is by the actual range between primary standard substance and x-ray system, add that prescan position finishes the actual relative distance between scanning position and primary standard substance, finish the distance between scanning position and x-ray system to obtain prescan position.
Alternatively, on described electronic photo, show two or more prescan positions.
Compared with prior art, the present invention has the following advantages:
While utilizing CT provided by the present invention or PET-CT system to position, first utilize imaging device to obtain electronic photo, on electronic photo, not only show patient's prescan position, can also on electronic photo, find the corresponding position of primary standard substance, start scanning position according to prescan position on electronic photo, scanning position is finished at prescan position, relative distance between primary standard substance, and the enlargement ratio of imaging device, can obtain prescan position and start scanning position, scanning position is finished at prescan position, actual relative distance between primary standard substance, and distance between primary standard substance and x-ray system is known, thereby can determine prescan position and start the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position, this distance that moves control examinating couch can realize carries out CT scan to patient's prescan position, thereby can not be subject to X-radiation, reduce patient's healthy hidden danger.
In addition, in the localization method that existing CT or PET-CT system scan, often need to make examinating couch move a very long time, in the moving process of examinating couch, patient is scanned to obtain spacer, just can learn that according to spacer examinating couch starts scanning position parameter and examinating couch finishes scanning position parameter, make positioning time long, and patient's examinating couch in the time utilizing CT provided by the present invention or PET-CT system to position keeps motionless, by taking pictures, measure electronic photo and calculate and just can learn the beginning scanning position of examinating couch and the end scanning position of examinating couch afterwards, shorten positioning time.
Accompanying drawing explanation
Fig. 1 utilizes spacer to obtain the schematic diagram of patient's prescan position sweep limits in the localization method that scans of existing CT or PET-CT system;
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 utilizes electronic photo to obtain the schematic diagram of 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 utilizes electronic photo to obtain the schematic diagram of patient's prescan position sweep limits in embodiments of the invention two.
The specific embodiment
Below in conjunction with accompanying drawing, by specific embodiment, technical scheme of the present invention is carried out to clear, complete description, obviously, described embodiment is only a part for embodiment of the present invention, rather than they are whole.According to these embodiment, those of ordinary skill in the art is obtainable all other embodiments under the prerequisite without creative work, all belong to protection scope of the present invention.
Embodiment mono-
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 comprise frame 110 and examinating couch 120, and frame 110 has the Z axis that is parallel to coordinate system around system axis S() rotation rotatable part 130.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 it is upper that central point O is positioned at system axis S, and x-ray system can rotate around central point O.
Fig. 3 is the front view (along the view of 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 (along the view of 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 (along the view of X-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention one, in conjunction with shown in Fig. 3 to Fig. 5, CT in the present invention or PET-CT system 100 also comprise the imaging device 150 for obtaining the electronic photo that shows patient's prescan position, as a specific embodiment, imaging device 150 is arranged on examinating couch 120 tops (as shown in Figures 3 to 5) or side (as shown in Figures 7 and 8).As a specific embodiment, imaging device 150 can be photographic head or photographing unit.Certainly, imaging device 150 can be also other electronic equipment with camera function, and for example, notebook computer, computer etc. all has camera function.Imaging device 150 has optical center line 151, and optical center line 151 is perpendicular to subject.In the time that imaging device 150 is arranged on examinating couch 120 top, imaging device 150 drops on examinating couch 120 along the projection meeting of X-direction in coordinate system, and optical center line 151 is parallel to the X-axis of coordinate system, and can take patient's direct picture.In the time that imaging device 150 is arranged on the side (shown in Fig. 7 and Fig. 8) 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 can take patient's side image, in the time that imaging device 150 is arranged on some height, imaging device 150 not only can be taken patient's side image, can also take patient's direct picture.According to the difference at patient's prescan position, imaging device 150 optionally can be arranged on to examinating couch top or examinating couch side, to guarantee that captured electronic photo can clearly demonstrate patient's prescan position, so that doctor can find out accurately the beginning scanning position at patient's prescan position and finish scanning position on electronic photo.
After imaging device 150 installations, in the situation that not changing imaging device 150 and arranging, the enlargement ratio of imaging device 150 is fixed value.Described enlargement ratio refers to that object is utilizing the ratio that becomes the size of image and the actual size of object in the captured photo of imaging device.After imaging device 150 installations, 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 comprise the primary standard substance that has interval between x-ray system, and in the present embodiment, described primary standard substance is imaging device optical center line 151.In this case, 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 Fig. 6, visual corresponding the be imaged as electronic photo central point 171 of imaging device optical center line 151 on electronic photo 170 of doing.
CT or PET-CT system 100 also comprise: start the distance between scanning position and x-ray system for obtaining prescan position, and the picture processing device 160 of the distance between scanning position and x-ray system is finished at prescan position.Picture processing device 160 comprises: photo measuring unit, it is for showing the captured electronic photo 170 of imaging device 150, and prescan position in electronic photo 170 is started to the relative distance that scanning position, prescan position finish between scanning position, primary standard substance measure, after utilizing the size of specific part on photo measuring unit measurement electronic photo, after the enlargement ratio by measurement size divided by imaging device 150, just can know the full-size(d) size of specific part; Computing unit, its for the electronic photo 170 prescan positions that obtain according to photo measuring unit start scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and actual range between the enlargement ratio of imaging device, primary standard substance and x-ray system, obtain prescan position and start the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
As a specific embodiment, picture processing device 160 is computer, in this case, described photo disposal unit is that the photo being arranged in picture processing device 160 shows and processing module, this module can display photos and comparison film measure, computing unit is the computing module being arranged in picture processing device 160, and this module can realize computing function according to specific calculation formula.As a specific embodiment, described photo shows and processing module is PHOTOSHOP software or the ACDSee software being arranged in picture processing device 160, and described computing module is the software with specific calculation formula being arranged in picture processing device 160.
In one embodiment, CT or PET-CT system 100 also comprise: the imaging device control device being connected with imaging device 150, imaging device control device may be controlled to as the unlatching of equipment 150 or cuts out, for example, preparing to utilize CT or PET-CT system 100 can imaging device 150 be opened by imaging device control device before carrying out Scan orientation, utilizing CT or PET-CT system 100 can imaging device 150 cut out by imaging device control device after completing Scan orientation.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 comprise: make for ordering about examinating couch 120 horizontal movement device (not shown) moving horizontally, can select suitable horizontal movement device according to the required movement travel of examinating couch 120; 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 has obtained electronic photo, electronic photo is transferred to photo measuring unit, utilize after photo disposal software in photo measuring unit measures the specific part of electronic photo, measurement result is transferred to computing unit, computing unit calculates patient's prescan position according to the specific computing formula of measurement result utilization and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at patient's prescan position.Computing unit has obtained patient's prescan position and has started the distance between scanning position and x-ray system, and after patient's prescan position finishes the distance between scanning position and x-ray system, send the instruction that drives horizontal movement device setting in motion to horizontal movement device control device 140, horizontal movement device control device 140 is received this instruction rear drive horizontal movement device motion.
In other embodiments, also can be by wherein two or more being integrated in a computer in imaging device control device, photo measuring unit, computing unit, horizontal movement device control device 140, as long as guarantee to realize function separately, can not be confined to above-described embodiment.
As a specific embodiment, in order to realize CT or PET-CT system 100 is integrated greatly, and be convenient to the electricity control of CT or PET-CT system 100, in CT or PET-CT system 100, picture processing device 160 is computer, described photo measuring unit is that the photo being arranged in picture processing device 160 shows and processing module, this photo shows and processing module can show that display photos comparison film measure, described computing unit is the computing module being arranged in picture processing device 160, this computing module can be realized computing function according to specific computing formula, imaging device control device is the control module being 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 can directly be used as imaging device control device, to control the unlatching of imaging device 150 or to close, horizontal movement device control device 140 is connected with picture processing device 160, like this, picture processing device 160 is controlled after imaging device 150 obtained electronic photo, can directly utilize the photo measuring unit in picture processing device 160 to show described electronic photo, and measure the size of specific part in electronic photo, computing unit in picture processing device 160 directly obtains patient's prescan position according to the specific computing formula of this size utilization and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished 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 having obtained patient's prescan position, picture processing device 160 starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at patient's prescan position, horizontal movement device control device 140 just drives horizontal movement device motion at once.
CT based in above-described embodiment or PET-CT system, continue with reference to shown in Fig. 3 to Fig. 6, the invention provides the localization method that a kind of CT or PET-CT system scan.
Utilizing before CT or PET-CT system position, should guarantee that imaging device 150 can obtain clear photograph.
First, patient utilizes imaging device control device to open imaging device 150 after lying low on examinating couch 120 with correct posture, and patient is taken pictures and obtains electronic photo.Because the areas imaging of imaging device 150 is larger, electronic photo can demonstrate patient's complete image, comprises the image at patient's prescan position.
Then, utilize picture processing device 160 to process electronic photo 170, start the distance between scanning position and x-ray system to obtain prescan position, and prescan position finishes the distance between scanning position and x-ray system, the step that electronic photo 170 is processed comprises:
Utilize photo measuring unit to show electronic photo 170, and prescan position in electronic photo 170 is started to the relative distance that scanning position, prescan position finish between scanning position, primary standard substance measure;
According to prescan position on measured electronic photo 170 start scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, the actual relative distance between scanning position, primary standard substance (being imaging device optical center line 151) is finished at prescan position;
In conjunction with the actual range between primary standard substance and x-ray system (being the horizontal range L1 between imaging device centrage 151 and x-ray system), computing unit calculates prescan position and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
As a specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 6, on electronic photo 170, determine 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, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the first labelling M1 and electronic photo central point 171, and distance between the second labelling M2 and electronic photo central point 171.Then, utilize computing unit by the distance between the first labelling M1 and electronic photo central point 171 enlargement ratio divided by imaging device, to obtain, prescan position starts scanning position and primary standard substance is the actual range between imaging device optical center line 151; Utilize computing unit by the distance between the second labelling M2 and electronic photo central point 171 enlargement ratio divided by imaging device, to obtain, scanning position is finished at prescan position and primary standard substance is the actual range between imaging device optical center line 151.
As another one specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 6, on electronic photo 170, determine 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, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the first labelling M1 and electronic photo central point 171, and distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the distance between the first labelling M1 and electronic photo central point 171 enlargement ratio divided by imaging device, to obtain, prescan position starts scanning position and primary standard substance is the actual range between imaging device optical center line 151; Utilize computing unit by the distance between the second labelling M2 and the first labelling M1 the enlargement ratio divided by imaging device, add that prescan position starts scanning position and primary standard substance is the actual range between imaging device optical center line 151, to obtain, scanning position is finished at prescan position and primary standard substance is the actual range between imaging device optical center line 151.
As another one specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 6, on electronic photo 170, determine 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, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the second labelling M2 and electronic photo central point 171, and distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the distance between the second labelling M2 and electronic photo central point 171 enlargement ratio divided by imaging device, to obtain, scanning position is finished at prescan position and primary standard substance is the actual range between imaging device optical center line 151; Utilize computing unit that scanning position is finished in prescan position and primary standard substance is the actual range between imaging device optical center line 151, deduct distance between the second labelling M2 and the first labelling M1 enlargement ratio divided by imaging device, to obtain, prescan position starts scanning position and primary standard substance is the actual range between imaging device optical center line 151.
Be imaging device optical center line 151 more close x-ray systems (prescan position starts scanning position and be positioned at the right side of imaging device optical center line 151 in Fig. 5 in this case) when prescan position starts scanning position than primary standard substance, 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, deduct prescan position and start actual range between scanning position and primary standard substance (be distance that on electronic photo 170, prescan position starts scanning position and electronic photo central point 171 divided by imaging device enlargement ratio).Be imaging device optical center line 151 further from x-ray system (in Fig. 5, prescan position starts scanning position and be positioned at the left side of imaging device optical center line 151 in this case) when prescan position starts scanning position than primary standard substance, 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 actual range between scanning position and primary standard substance (be distance that on electronic photo 170, prescan position starts scanning position and electronic photo central point 171 divided by imaging device enlargement ratio).
In like manner, finishing scanning position when prescan position is imaging device optical center line 151 more close x-ray systems (right sides that imaging device optical center line 151 is finished scanning position and is positioned at prescan position in Fig. 5 in this case) than primary standard substance, prescan position is finished 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 prescan position and finish actual range between scanning position and primary standard substance (be distance that on electronic photo 170, scanning position and electronic photo central point 171 are finished in prescan position divided by imaging device enlargement ratio).Finishing scanning position when prescan position is imaging device optical center line 151 further from x-ray system (left side that imaging device optical center line 151 is finished scanning position and is positioned at prescan position in Fig. 5 in this case) than primary standard substance, prescan position is finished 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 finishes actual range between scanning position and primary standard substance (be distance that on electronic photo 170, scanning position and electronic photo central point 171 are finished in prescan position divided by imaging device enlargement ratio).
Obtain patient's prescan position and start the distance between scanning position and x-ray system, and after patient's prescan position finishes the distance between scanning position and x-ray system, horizontal movement device control device 140 is controlled the horizontal movement device of examinating couch and is started working, make patient's prescan position towards the direction motion near x-ray system, when knowing that according to horizontal movement device control device 140 displacement of examinating couch is that patient's prescan position starts CT scan while starting the distance between scanning position and x-ray system, and control examinating couch moves always, until know that according to horizontal movement device control device 140 displacement of examinating couch is that patient's prescan position stops CT scan while finishing the distance between scanning position and x-ray system.
As a specific embodiment, before examinating couch moves, utilize horizontal movement device control device 140 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 to finish distance between scanning position and x-ray system known at patient's prescan position, therefore, can obtain the corresponding location parameter of examinating couch when starting when CT scan the corresponding location parameter of examinating couch and finishing CT scan, like this, can be according to the location parameter of horizontal movement device control device 140 Real-time Obtaining examinating couches, when detecting that the location parameter of examinating couch is to start CT scan while starting the corresponding location parameter of CT scan, until stop CT scan in the time that the location parameter of examinating couch is the corresponding location parameter of end CT scan.As a specific embodiment, the movement travel that can make examinating couch hour corresponding examinating couch location parameter 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 that examinating couch starts scanning position parameter and examinating couch finishes scanning position parameter.
As a specific embodiment, as shown in Figures 3 to 5, imaging device 150 can just in time be arranged on the top of examinating couch 120 centers.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 crossing with system axis S.
In actual applications, sometimes need the multiple specific paries to patient simultaneously to scan, at this moment need to calculate respectively distance and the prescan position that each prescan position starts between scanning position and x-ray system and finish the distance between scanning position and x-ray system.
From the above, it is the distance between imaging device optical center line and x-ray system that the present invention first obtained primary standard substance before patient is carried out to CT scan, then utilize imaging device to take pictures to patient, on the electronic photo obtaining, show patient's prescan position, utilize photo measuring unit to measure prescan position on electronic photo and start scanning position, scanning position is finished at prescan position, relative distance between primary standard substance, can obtain prescan position in conjunction with the enlargement ratio of imaging device and start scanning position, scanning position is finished at prescan position, actual relative distance between primary standard substance, and that primary standard substance is horizontal range between imaging device optical center line and x-ray system is known, therefore can know the actual range between beginning scanning position and the x-ray system at patient's prescan position, and actual range between end scanning position and the x-ray system at patient's prescan position, then, drive examinating couch to start mobile, in the time that being the actual range between beginning scanning position and the x-ray system at patient's prescan position, the displacement of examinating couch can start CT scan, until finish CT scan in the time that the displacement of examinating couch is the actual range between end scanning position and the x-ray system at patient's prescan position.
Compared with the localization method scanning with existing CT or PET-CT system, while utilizing CT provided by the present invention or PET-CT system to position, first utilize imaging device to obtain electronic photo, on electronic photo, not only show patient's prescan position, can also on electronic photo, find the corresponding position of primary standard substance, start scanning position according to prescan position on electronic photo, scanning position is finished at prescan position, relative distance between primary standard substance, and the enlargement ratio of imaging device, can obtain prescan position and start scanning position, scanning position is finished at prescan position, actual relative distance between primary standard substance, and distance between primary standard substance and x-ray system is known, thereby can determine prescan position and start the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position, this distance that moves control examinating couch can realize carries out CT scan to patient's prescan position, thereby can not be subject to X-radiation, reduce patient's healthy hidden danger.
In addition, in the localization method that existing CT or PET-CT system scan, often need to make examinating couch move a very long time, in the moving process of examinating couch, patient is scanned to obtain spacer, just can learn that according to spacer examinating couch starts scanning position parameter and examinating couch finishes scanning position parameter, make positioning time long, and patient's examinating couch in the time utilizing CT provided by the present invention or PET-CT system to position keeps motionless, by taking pictures, measure electronic photo and calculate and just can learn the beginning scanning position of examinating couch and the end scanning position of examinating couch afterwards, shorten positioning time.
Embodiment bis-
Fig. 7 is the top view (along the view of 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 (along the view of Z-direction projection gained in Fig. 2) of CT or PET-CT system in embodiments of the invention two, by more known to Fig. 7, Fig. 8 and Fig. 3, Fig. 4, in embodiment bis-, in CT or PET-CT system and embodiment mono-, 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, rather than imaging device optical center line 151.As a specific embodiment, primary standard substance 180 is rectangle projection, rectangular recess or rectangle printed patterns.Certainly, primary standard substance 180 is not limited only to above-described embodiment, as long as guarantee that the primary standard substance 180 on electronic photo can show clearly.When the position of examinating couch 120 maintains static, the distance L 2 between primary standard substance 180 and x-ray system is fixed value.Distance L 2 between primary standard substance 180 and x-ray system refers to: x-ray system rotate around central point O along X-direction the horizontal range between the projection 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 scan.
Utilizing before CT or PET-CT system carry 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 after lying low on examinating couch 120 with correct posture, and patient is taken pictures and obtains electronic photo.Because the areas imaging of imaging device 150 is larger, electronic photo can demonstrate patient's complete image, comprises the image at patient's prescan position and the image 181 of primary standard substance 180.
Then, utilize picture processing device 160 to process electronic photo 170, start the distance between scanning position and x-ray system to obtain prescan position, and prescan position finishes the distance between scanning position and x-ray system, the step that electronic photo 170 is processed comprises:
Utilize photo measuring unit to show electronic photo 170, and prescan position in electronic photo 170 is started to the relative distance that scanning position, prescan position finish between scanning position, primary standard substance (being primary standard substance image 181) measure;
According to prescan position on measured electronic photo 170 start scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, the actual relative distance between scanning position, primary standard substance 180 is finished at prescan position;
In conjunction with the actual range between primary standard substance 180 and x-ray system (being the distance L 2 between primary standard substance 180 and x-ray system), computing unit calculates prescan position and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
As a specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 9, on electronic photo 170, determine the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the first labelling M1 and primary standard substance image 181, and distance between the second labelling M2 and primary standard substance image 181.Then, utilize computing unit by the distance between the first labelling M1 and primary standard substance image 181 enlargement ratio divided by imaging device, start the actual range between scanning position and primary standard substance 180 to obtain prescan position; Utilize computing unit by the distance between the second labelling M2 and primary standard substance image 181 enlargement ratio divided by imaging device, finish the actual range between scanning position and primary standard substance 180 to obtain prescan position.
As another one specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 9, on electronic photo 170, determine the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the first labelling M1 and primary standard substance image 181, and distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the distance between the first labelling M1 and primary standard substance image 181 enlargement ratio divided by imaging device, start the actual range between scanning position and primary standard substance 180 to obtain prescan position; Utilize computing unit by the distance between the second labelling M2 and the first labelling M1 the enlargement ratio divided by imaging device, add prescan position and start the actual range between scanning position and primary standard substance 180, finish the actual range between scanning position and primary standard substance 180 to obtain prescan position.
As another one specific embodiment, utilize the electronic photo 170 shown in photo measuring unit displayed map 9, on electronic photo 170, determine the beginning scanning position at patient's prescan position and the end scanning position at patient's prescan position, patient's prescan position is started to scanning position and make the first labelling M1, scanning position is finished in patient's prescan position and make the second labelling M2, preferably, the first labelling M1 and the second labelling M2 are straight line, and the first labelling M1 and the second labelling M2 are parallel to the Y-axis of coordinate system.Then, utilize photo measuring unit to measure the distance between the second labelling M2 and primary standard substance image 181, and distance between the second labelling M2 and the first labelling M1.Then, utilize computing unit by the distance between the second labelling M2 and primary standard substance image 181 enlargement ratio divided by imaging device, finish the actual range between scanning position and primary standard substance 180 to obtain prescan position; Utilize computing unit that the actual range between scanning position and primary standard substance 180 is finished in prescan position, deduct distance between the second labelling M2 and the first labelling M1 enlargement ratio divided by imaging device, start the actual range between scanning position and primary standard substance 180 to obtain prescan position.
When prescan position starts scanning position than the more close x-ray system of primary standard substance 180 (prescan position starts scanning position and be positioned at the upside of primary standard substance 180 in Fig. 7 in this case), prescan position starts the distance between scanning position and x-ray system and is: by the distance L between primary standard substance 180 and x-ray system 2, deduct prescan position and start actual range between scanning position and primary standard substance 180 (be distance that on electronic photo 170, prescan position starts scanning position and primary standard substance image 181 divided by imaging device enlargement ratio).When prescan position start scanning position than primary standard substance 180 further from x-ray system (in Fig. 7, prescan position starts scanning position and is positioned at the downside of imaging device optical center line 151 in this case), prescan position starts the distance between scanning position and x-ray system and is: by the distance L between primary standard substance 180 and x-ray system 2, add that prescan position starts actual range between scanning position and primary standard substance 180 (be distance that on electronic photo 170, prescan position starts scanning position and primary standard substance image 181 divided by imaging device enlargement ratio).
In like manner, when scanning position is finished than the more close x-ray system of primary standard substance 180 (upside of primary standard substance 180 is finished scanning position and is positioned at prescan position in Fig. 7 in this case) in prescan position, prescan position is finished the distance between scanning position and x-ray system and is: by the distance L between primary standard substance 180 and x-ray system 2, deduct prescan position and finish actual range between scanning position and primary standard substance 180 (be distance that on electronic photo 170, scanning position and primary standard substance image 181 are finished in prescan position divided by imaging device enlargement ratio).When prescan position finish scanning position than primary standard substance 180 further from x-ray system (in Fig. 7, the downside of imaging device optical center line 151 is finished scanning position and is positioned at prescan position in this case), prescan position is finished the distance between scanning position and x-ray system and is: by the distance L between primary standard substance 180 and x-ray system 2, add that prescan position finishes actual range between scanning position and primary standard substance 180 (be distance that on electronic photo 170, scanning position and primary standard substance image 181 are finished in prescan position divided by imaging device enlargement ratio).
From the above, the present invention first obtained primary standard substance and is arranged on the projection on examinating couch before patient is carried out to CT scan, distance between groove or printed patterns and x-ray system, then utilize imaging device to take pictures to patient, on the electronic photo obtaining, show 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 finished at prescan position, relative distance between primary standard substance, can obtain prescan position in conjunction with the enlargement ratio of imaging device and start scanning position, scanning position is finished at prescan position, actual relative distance between primary standard substance, and horizontal range between primary standard substance and x-ray system is known, therefore can know the actual range between beginning scanning position and the x-ray system at patient's prescan position, and actual range between end scanning position and the x-ray system at patient's prescan position, then, drive examinating couch to start mobile, in the time that being the actual range between beginning scanning position and the x-ray system at patient's prescan position, the displacement of examinating couch can start CT scan, until finish CT scan in the time that the displacement of examinating couch is the actual range between end scanning position and the x-ray system at patient's prescan position.
It should be noted that, primary standard substance described in the present invention can not only be confined to above-described embodiment, and 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 other form arrange, as long as while taking pictures, this primary standard substance can be presented on electronic photo together with patient's prescan position, and can know the distance between primary standard substance and x-ray system, do not enumerate at this.
Above-mentioned by the explanation of embodiment, should be able to make professional and technical personnel in the field understand better the present invention, and can reproduce and use the present invention.Those skilled in the art can do not depart from the spirit and scope of the invention in the situation that to above-described embodiment do various changes according to described principle herein and modification is apparent.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. CT or a PET-CT system, is characterized in that, comprising:
Examinating couch;
Comprise the x-ray system of x-ray source and X-ray detector;
And between described x-ray system, there is the primary standard substance at interval;
For obtaining the imaging device of the electronic photo that shows patient's prescan position;
Picture processing device, starts the distance between scanning position and x-ray system for obtaining prescan position, and prescan position finishes the distance between scanning position and x-ray system, and described picture processing device comprises:
Photo measuring unit, for showing the captured electronic photo of described imaging device, and starts to prescan position in described electronic photo the relative distance that scanning position, prescan position finish in scanning position, primary standard substance arbitrarily between the two and measures;
Computing unit, the electronic photo prescan position that is used for obtaining according to described photo measuring unit starts scanning position, any relative distance between the two in scanning position, primary standard substance is finished at prescan position, and actual range between the enlargement ratio of imaging device, primary standard substance and x-ray system, obtain prescan position and start the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
2. CT according to claim 1 or PET-CT system, is characterized in that, described imaging device is photographing unit or photographic head.
3. CT according to claim 1 or PET-CT system, is characterized in that, described imaging device is arranged on described examinating couch top or side.
4. CT according to claim 1 or PET-CT system, is characterized in that, described primary standard substance is imaging device optical center line; Or described primary standard substance is projection, groove, the printed patterns being fixedly installed on described examinating couch.
5. according to the CT described in claim 1 to 4 any one or PET-CT system, it is characterized in that, described picture processing device is computer, and described photo measuring unit is that the photo being arranged in described picture processing device shows and processing module.
6. CT according to claim 1 or PET-CT system, is characterized in that, also comprises the imaging device control device being connected with described imaging device.
7. CT according to claim 5 or PET-CT system, is characterized in that, described picture processing device is connected with described imaging device.
8. CT according to claim 5 or PET-CT system, it is characterized in that, also comprise for ordering about described examinating couch and make the horizontal movement device moving horizontally, and for controlling described horizontal movement device motion, 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 according to claim 8 or PET-CT system, is characterized in that, described horizontal movement device control device is computer.
10. the localization method that CT or PET-CT system scan as described in claim 1 to 9 any one, is characterized in that, comprising:
After patient lies low on examinating couch, imaging device obtains the electronic photo that shows patient's prescan position;
Utilize picture processing device to process described electronic photo, start the distance between scanning position and x-ray system to obtain prescan position, and prescan position finishes the distance between scanning position and x-ray system, the step that described electronic photo is processed comprises:
Utilize photo measuring unit to show described electronic photo, and prescan position in described electronic photo is started to the relative distance that scanning position, prescan position finish between scanning position, primary standard substance measure;
According to prescan position on measured electronic photo start scanning position, the relative distance between scanning position, primary standard substance is finished at prescan position, and the enlargement ratio of imaging device, computing unit calculates that prescan position starts scanning position, the actual relative distance between scanning position, primary standard substance is finished at prescan position;
In conjunction with the actual range between primary standard substance and x-ray system, computing unit calculates prescan position and starts the distance between scanning position and x-ray system, and the distance between scanning position and x-ray system is finished at prescan position.
The localization method that 11. CT according to claim 10 or PET-CT system scan, is characterized in that, the step that described electronic photo is processed comprises:
Utilize photo measuring unit to show described electronic photo, and the relative distance that prescan position in described electronic photo is started relative distance between scanning position and primary standard substance and prescan position to finish between scanning position and primary standard substance is measured;
Prescan position in measured electronic photo is started relative distance between scanning position and the primary standard substance enlargement ratio divided by imaging device by computing unit, start the actual relative distance between scanning position and primary standard substance to obtain prescan position, relative distance between scanning position and the primary standard substance enlargement ratio divided by imaging device is finished in prescan position in measured electronic photo, finish the actual relative distance between scanning position and primary standard substance to obtain prescan position;
When prescan position starts scanning position than primary standard substance when more close described x-ray system, computing unit is by the actual range between primary standard substance and x-ray system, deduct prescan position and start the actual relative distance between scanning position and primary standard substance, start the distance between scanning position and x-ray system to obtain prescan position;
When prescan position starts scanning position than primary standard substance during further from described x-ray system, 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, start the distance between scanning position and x-ray system to obtain prescan position;
When scanning position is finished than primary standard substance when more close described x-ray system in prescan position, computing unit is by the actual range between primary standard substance and x-ray system, deduct prescan position and finish the actual relative distance between scanning position and primary standard substance, finish the distance between scanning position and x-ray system to obtain prescan position;
When scanning position is finished than primary standard substance during further from described x-ray system in prescan position, computing unit is by the actual range between primary standard substance and x-ray system, add that prescan position finishes the actual relative distance between scanning position and primary standard substance, finish the distance between scanning position and x-ray system to obtain prescan position.
The localization method that 12. CT according to claim 10 or PET-CT system scan, is characterized in that, shows two or more prescan positions on described electronic photo.
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| CN113317809B (en) * | 2021-04-25 | 2024-01-16 | 明峰医疗系统股份有限公司 | CT scanner anti-collision method based on CT locating plate |
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