CN111773561A - Flat panel detector position offset detection tool and method and radiotherapy device - Google Patents
Flat panel detector position offset detection tool and method and radiotherapy device Download PDFInfo
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- CN111773561A CN111773561A CN202010661085.3A CN202010661085A CN111773561A CN 111773561 A CN111773561 A CN 111773561A CN 202010661085 A CN202010661085 A CN 202010661085A CN 111773561 A CN111773561 A CN 111773561A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
- A61N2005/1054—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using a portal imaging system
Abstract
The invention discloses a flat panel detector position offset detection tool, a flat panel detector position offset detection method and a radiotherapy device, wherein the detection tool comprises: the base plate is used for being fixed on the flat panel detector, the plurality of stand columns are fixed on the testing surface of the base plate, and the plurality of stand columns are uniformly distributed on the testing surface. According to the invention, the position offset of the flat panel detector relative to the radioactive source can be detected when the radiotherapy device frame is at different angles without the aid of a high-precision measuring tool, so that the position offset of the flat panel detector can be quickly obtained, and the detection tool has the advantages of simple structure, convenience in installation, simple detection method steps and convenience in operation.
Description
Technical Field
The invention belongs to the technical field of medical treatment, and particularly relates to a tool and a method for detecting position offset of a flat panel detector and a radiotherapy device.
Background
As shown in FIG. 2, modern radiation therapy devices are usually equipped with a flat panel detector, and the detector is used for electronic field imaging as a direct basis for the correct positioning of the patient, and the flat panel detector is also used for daily mechanical performance detection. The flat panel detector is fixed by a special supporting arm, and the flat panel is moved and fixed at a special position by the supporting arm according to needs, whether the position of the flat panel detector is accurate or not becomes a very important reference parameter, and if the reference position is not accurate, the basis for detecting the mechanical property of the radiotherapy device based on the flat panel detector is not accurate, so that the whole detection is not credible.
In the prior art, the positioning accuracy of the flat panel detector is detected by means of high-accuracy distance measuring sensors or gradienters and other equipment, and meanwhile, the whole process cannot be automatically completed, so that a large amount of energy and material resources are consumed for measurement and verification.
Disclosure of Invention
In order to solve the technical problems, the invention provides a flat panel detector position offset detection tool, a flat panel detector position offset detection method and a radiotherapy device.
In order to achieve the purpose, the technical scheme of the invention is as follows:
on one hand, the invention discloses a flat panel detector position offset detection tool, which comprises:
the substrate is used for being fixed on the flat panel detector;
the stand is fixed with N stand on the test surface of base plate, and N stand is evenly distributed on the test surface, and N is more than or equal to 2.
On the basis of the technical scheme, the following improvements can be made:
preferably, the N columns are symmetrically arranged around the center of the testing surface of the substrate, wherein N is an even number.
Preferably, the thickness of the substrate is 2-3 mm, and the upright column is a cylinder with the diameter of 1 mm and the height of 5-10 cm.
Preferably, the substrate is an aluminum plate or a carbon fiber plate, and the pillar is a tungsten pillar or a copper pillar.
On the other hand, the invention also discloses a method for detecting the position offset of the flat panel detector, which specifically comprises the following steps:
s1: fixedly mounting a detection tool on the upper surface of the flat panel detector;
s2: after the detection tool is fixed, rotating a rotating frame of the radiotherapy device to 0 degrees, starting a ray source to carry out electronic radiation field image acquisition, wherein N stand column images are arranged on an obtained electronic image, and recording the positions of the N stand column images in the whole imaging area of the flat panel detector as a reference image for judging the position of the flat panel detector;
s3: and rotating the rotating frame of the radiotherapy device by a certain angle, starting the ray source again for electronic imaging, comparing the image of the detection tool on the flat panel detector obtained at the moment with the image obtained at the position of 0 degrees, thereby detecting whether the flat panel detector has a position deviation relative to the ray source, and if so, calculating the actual position deviation of the flat panel detector according to the image deviation of the stand column.
Preferably, step S3 specifically includes the following steps: the method comprises the steps of respectively rotating a rotating frame of the radiotherapy device to a 90-degree position, a 180-degree position and a 270-degree position, starting a ray source at each position for electronic imaging, comparing an image of a detection tool obtained at each position on a flat panel detector with an image obtained at the 0-degree position, detecting whether the flat panel detector at the position is shifted relative to the ray source or not, and calculating the actual position offset of the flat panel detector according to the image offset of an upright column if the flat panel detector at the position is shifted.
Preferably, when the rotating gantry of the radiotherapy apparatus is rotated to the 90 ° position or 270 ° position, the actual flat panel detector position offset is calculated by the following method:
obtaining the number of pixels occupied by the upright post image according to the size of each pixel of the flat panel detector, thereby calculating the size of the upright post image;
comparing the image of the detection tool on the flat panel detector obtained at the 90-degree position or the 270-degree position with the image obtained at the 0-degree position,
if the size of the upper column image is the same as that of the lower column image, the flat panel detector has no position deviation in the vertical direction;
if the sizes of the upper upright post image and the lower upright post image are different, the flat panel detector has position deviation in the vertical direction, the size difference of the upright post images is obtained according to the compared image difference, the actual offset of the flat panel detector can be obtained due to the fact that the sizes of the upright post images are known,
or calibrating the offset of the flat panel detector in advance, setting the offset of the flat panel detector as a fixed number of x millimeters, wherein x is 1,2, … n, performing electronic imaging, recording the difference of the upright post images when the flat panel detector has different offsets as a reference value, and comparing the difference of the upright post images obtained actually with the reference value to obtain the actual offset of the flat panel detector.
As a preferred scheme, calibrating offset of the flat panel detector in advance, setting the offset of the flat panel detector as a fixed number of x millimeters, where x is 1,2, … n, performing electronic imaging, recording differences of the upright post images when the flat panel detector has different offsets as reference values, and comparing the differences of the upright post images obtained actually with the reference values to obtain actual offset of the flat panel detector;
and when the actual offset is a non-integer, obtaining the offset by adopting an interpolation mode.
Preferably, when the rotating gantry of the radiotherapy apparatus is rotated to a 180 ° position, the actual flat panel detector position offset is calculated as follows:
obtaining the number of pixels occupied by the upright post image according to the size of each pixel of the flat panel detector, thereby calculating the size of the upright post image;
comparing the image of the detection tool on the flat panel detector obtained at the position of 180 degrees with the image obtained at the position of 0 degree,
if the distance between the flat panel detector and the ray source is unchanged and the size of the upright column image is unchanged, the flat panel detector has no position deviation;
if the distance between the flat panel detector and the ray source is shortened or the size of the upright post image is enlarged, the flat panel detector is subjected to position deviation, the size difference of the upright post image is obtained according to the compared image difference, the actual offset of the flat panel detector can be obtained due to the fact that the size of the upright post image is known,
or calibrating the offset of the flat panel detector in advance, setting the offset of the flat panel detector as a fixed number of x millimeters, wherein x is 1,2, … n, performing electronic imaging, recording the difference of the upright post images when the flat panel detector has different offsets as a reference value, and comparing the difference of the upright post images obtained actually with the reference value to obtain the actual offset of the flat panel detector.
In addition, the invention also discloses a radiotherapy device, which comprises a flat panel detector position offset detection tool; alternatively, the radiotherapy device is used for implementing a flat panel detector position offset detection method.
The invention solves the problems that in the prior art, the positioning precision detection of the flat plate supporting arm needs high-precision distance measuring tools, gradienters and other tools, the process is complicated, and the operation is difficult. The invention provides a tool and a method for detecting the position offset of a flat panel detector and a radiotherapy device, which can detect the position offset of the flat panel detector relative to a radioactive source when a frame of the radiotherapy device is at different angles without using a high-precision measuring tool, only needs to tightly fix the detection tool and the flat panel detector, then carries out electronic radiation field imaging at different angles, and can quickly obtain the position offset of the flat panel detector by matching with a corresponding image processing algorithm according to an obtained electronic image.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a flat panel detector position offset detection tool according to an embodiment of the present invention.
Fig. 2 is a front view of a radiotherapy apparatus provided in the prior art.
Fig. 3 is a front view of a radiation therapy apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a flat panel detector with a frame at 0 ° position according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a flat panel detector with a frame at 90 ° position according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a flat panel detector in a position 180 of a frame according to an embodiment of the present invention.
Fig. 7 is a schematic view of a flat panel detector with a frame at a 270 ° position according to an embodiment of the present invention.
Fig. 8 is a schematic diagram illustrating the offset of the flat panel detector when the frame is at 90 ° according to the embodiment of the present invention.
Fig. 9 is a schematic diagram illustrating the offset of the flat panel detector when the frame is at the 270 ° position according to the embodiment of the present invention.
Fig. 10 is a schematic diagram illustrating the offset of the flat panel detector when the frame is at the 180 ° position according to the embodiment of the present invention.
Fig. 11 is a flowchart of a method for detecting a position offset of a flat panel detector according to an embodiment of the present invention.
1-detection tool, 11-substrate, 12-upright post, 2-radiotherapy device, 21-flat panel detector, 22-frame, 23-ray source, 24-detector support and 25-radiation field.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
On one hand, the embodiment of the invention discloses a flat panel detector position offset detection tool, as shown in fig. 1, comprising:
the substrate 11, the substrate 11 is used for fixing on the flat panel detector 21;
the stand 12, be fixed with 4 stands 12 on the test face of base plate 11, and 4 stands 12 are evenly distributed on the test face.
The detection tool is simple in structure and convenient and fast to install. The number of posts 12 can be 6, 8, 10, etc.
In order to further optimize the implementation effect of the present invention, in other embodiments, the rest features are the same, except that 4 columns 12 are symmetrically arranged with respect to the center of the testing surface of the substrate 11.
In order to further optimize the implementation effect of the present invention, in other embodiments, the other features are the same, except that the thickness of the substrate 11 is 2 to 3 mm, and the upright 12 is a cylinder with a diameter of 1 mm and a height of 5 to 10 cm.
Of course, in other embodiments, the thickness and size of the substrate 11 can be adjusted adaptively according to the size of the specific flat panel detector 21, and the size and shape of the pillar 12 are not limited.
In order to further optimize the implementation effect of the present invention, in other embodiments, the rest features are the same, except that the substrate 11 is an aluminum plate or a carbon fiber plate, and the pillars 12 are tungsten pillars or copper pillars.
Of course, in other embodiments, the substrate 11 of the detection tool is not limited to an aluminum plate and a carbon fiber plate, and may be a plate made of other materials with high strength and high transmittance of rays. Such as carbon fiber plates, the pillars 12 are not limited to tungsten pillars and copper pillars, but may be other high-density metal pillars.
On the other hand, the embodiment of the present invention further discloses a method for detecting a position offset of the flat panel detector 21, as shown in fig. 11, specifically including the following steps:
s1: fixedly mounting the detection tool 1 on the upper surface of the flat panel detector 21;
s2: after the detection tool is fixed, rotating the rotating frame 22 of the radiotherapy device 2 to 0 degrees, as shown in fig. 4, starting the radiation source 23 to perform electronic radiation field image acquisition, wherein at the moment, 4 upright post images exist on the obtained electronic image, and recording the positions of the 4 upright post images in the whole imaging area of the flat panel detector 21 respectively as reference images for judging the position of the flat panel detector 21;
s3: rotating the rotating frame 22 of the radiotherapy device 2 by a certain angle, starting the radiation source again for electronic imaging, comparing the image of the detection tool on the flat panel detector 21 obtained at the moment with the image obtained at the position of 0 degrees, thereby detecting whether the flat panel detector 21 has a position deviation relative to the radiation source 23, and if so, calculating the actual position deviation of the flat panel detector 21 according to the image deviation of the stand column.
The flat panel detector 21 is supported by a detector support 24 and the radiation field 25 of the radiation source 23 is as shown.
In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the following are specifically included in step S3: the rotating frame 22 of the radiotherapy device 2 is respectively rotated to a 90-degree position (as shown in fig. 5), a 180-degree position (as shown in fig. 6) and a 270-degree position (as shown in fig. 7), the radiation source 23 is started to perform electronic imaging at each position, the image of the detection tool on the flat panel detector 21 obtained at each position is compared with the image obtained at the 0-degree position, so that whether the flat panel detector 21 at the position is shifted relative to the radiation source 23 or not is detected, and if the position is shifted, the actual position shift amount of the flat panel detector 21 is calculated according to the vertical column image shift amount.
Further, on the basis of the above-described embodiment, when the rotating gantry 22 of the radiotherapy apparatus 2 rotates to the 90 ° position or the 270 ° position, the actual flat panel detector 21 position offset is calculated by using the following method:
obtaining the number of pixels occupied by the upright image according to the size of each pixel of the flat panel detector 21, thereby calculating the size of the upright image;
as shown in fig. 8 and 9 (where the solid line represents the 0 ° position image and the dotted line represents the shifted position image), the image of the inspection tool at the 90 ° position or 270 ° position on the flat panel detector 21 is compared with the image obtained at the 0 ° position,
if the size of the upper column image is the same as that of the lower column image, the flat panel detector 21 has no position deviation in the vertical direction;
if the sizes of the upper column image and the lower column image are different, the flat panel detector 21 has position deviation in the vertical direction, the size difference of the column images is obtained according to the compared image difference, the actual offset of the flat panel detector 21 can be obtained according to the geometric relationship of the diagram because the sizes of the column images are known,
or calibrating the offset of the flat panel detector 21 in advance, setting the offset of the flat panel detector 21 to be a fixed number such as 1 mm, 2 mm, 3 mm and the like for electronic imaging, recording the difference of the column images when the flat panel detector 21 has different offsets as a reference value, comparing the actually obtained difference of the column images with the reference value to obtain the actual offset of the flat panel detector 21, and obtaining the actual offset by adopting an interpolation mode when the actual offset is a non-integer.
Further, on the basis of the above-described embodiment, when the rotating gantry 22 of the radiotherapy apparatus 2 rotates to the 180 ° position, the actual flat panel detector 21 position offset is calculated by the following method:
obtaining the number of pixels occupied by the upright image according to the size of each pixel of the flat panel detector 21, thereby calculating the size of the upright image;
as shown in fig. 10 (where the solid line represents the 0 ° position image and the dotted line represents the shifted position image), the image of the inspection tool on the flat panel detector 21 obtained at the 180 ° position is compared with the image obtained at the 0 ° position,
if the distance between the flat panel detector 21 and the ray source 23 is not changed and the size of the column image is not changed, the flat panel detector 21 has no position deviation;
if the distance between the flat panel detector 21 and the radiation source 23 is shortened or the size of the column image is increased, the flat panel detector 21 is shifted, the size difference of the column image is obtained according to the compared image difference, and the actual offset of the flat panel detector 21 can be obtained according to the geometric relationship of the figure because the size of the column image is known,
or calibrating the offset of the flat panel detector 21 in advance, setting the offset of the flat panel detector 21 to be a fixed number of 1 mm, 2 mm, 3 mm and the like for electronic imaging, recording the difference of the upright post images when the flat panel detector 21 has different offsets as a reference value, and comparing the actually obtained difference of the upright post images with the reference value to obtain the actual offset of the flat panel detector 21.
In addition, as shown in fig. 3, the invention also discloses a radiotherapy device 2, and the radiotherapy device 2 comprises a flat panel detector position offset detection tool; alternatively, the radiotherapy apparatus 2 is used to implement the flat panel detector 21 position displacement amount detection method.
The invention solves the problems that in the prior art, the positioning precision detection of the flat plate supporting arm needs high-precision distance measuring tools, gradienters and other tools, the process is complicated, and the operation is difficult. The invention provides a flat panel detector position offset detection tool, a flat panel detector position offset detection method and a radiotherapy device, which can detect the position offset of a flat panel detector 21 relative to a radioactive source when a rack 22 of the radiotherapy device 2 is at different angles without using a high-precision measuring tool, only needs to tightly fix the detection tool and the flat panel detector 21, then carries out electronic radiation field imaging at different angles, and can quickly obtain the position offset of the flat panel detector 21 by matching with a corresponding image processing algorithm according to an obtained electronic image.
The various embodiments above may be implemented in cross-parallel.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. Dull and stereotyped detector position offset detects frock, its characterized in that includes:
the substrate is used for being fixed on the flat panel detector;
the testing surface of the substrate is fixed with N stand columns, the N stand columns are uniformly distributed on the testing surface, and N is more than or equal to 2.
2. The tool for detecting the position offset of the flat panel detector according to claim 1, wherein N columns are symmetrically arranged with respect to the center of the substrate testing surface, wherein N is an even number.
3. The tool for detecting the position offset of the flat panel detector according to claim 1, wherein the thickness of the substrate is 2-3 mm, and the upright column is a cylinder with the diameter of 1 cm and the height of 5-10 cm.
4. The tool for detecting the position offset of the flat panel detector according to any one of claims 1 to 3, wherein the substrate is an aluminum plate or a carbon fiber plate, and the columns are tungsten columns or copper columns.
5. The method for detecting the position offset of the flat panel detector is characterized by comprising the following steps:
s1: fixedly mounting the detection tool of any one of claims 1 to 4 on the upper surface of a flat panel detector;
s2: after the detection tool is fixed, rotating a rotating frame of the radiotherapy device to 0 degrees, starting a ray source to carry out electronic radiation field image acquisition, wherein N stand column images are arranged on an obtained electronic image, and recording the positions of the N stand column images in the whole imaging area of the flat panel detector as a reference image for judging the position of the flat panel detector;
s3: and rotating the rotating frame of the radiotherapy device by a certain angle, starting the ray source again for electronic imaging, comparing the image of the detection tool on the flat panel detector obtained at the moment with the image obtained at the position of 0 degrees, thereby detecting whether the flat panel detector has a position deviation relative to the ray source, and if so, calculating the actual position deviation of the flat panel detector according to the image deviation of the stand column.
6. The flat panel detector position offset detection method according to claim 5, wherein the step S3 specifically includes the following steps: the method comprises the steps of respectively rotating a rotating frame of the radiotherapy device to a 90-degree position, a 180-degree position and a 270-degree position, starting a ray source at each position for electronic imaging, comparing an image of a detection tool obtained at each position on a flat panel detector with an image obtained at the 0-degree position, detecting whether the flat panel detector at the position is shifted relative to the ray source or not, and calculating the actual position offset of the flat panel detector according to the image offset of an upright column if the flat panel detector at the position is shifted.
7. The flat panel detector position offset detection method according to claim 6, wherein when the rotating gantry of the radiotherapy apparatus rotates to the 90 ° position or the 270 ° position, the actual flat panel detector position offset is calculated by:
obtaining the number of pixels occupied by the upright post image according to the size of each pixel of the flat panel detector, thereby calculating the size of the upright post image;
comparing the image of the detection tool on the flat panel detector obtained at the 90-degree position or the 270-degree position with the image obtained at the 0-degree position,
if the size of the upper column image is the same as that of the lower column image, the flat panel detector has no position deviation in the vertical direction;
if the sizes of the upper upright post image and the lower upright post image are different, the flat panel detector has position deviation in the vertical direction, the size difference of the upright post images is obtained according to the compared image difference, the actual offset of the flat panel detector can be obtained due to the fact that the sizes of the upright post images are known,
or calibrating the offset of the flat panel detector in advance, setting the offset of the flat panel detector as a fixed number of x millimeters, wherein x is 1,2, … n, performing electronic imaging, recording the difference of the upright post images when the flat panel detector has different offsets as a reference value, and comparing the difference of the upright post images obtained actually with the reference value to obtain the actual offset of the flat panel detector.
8. The flat panel detector position offset detection method according to claim 7, wherein the flat panel detector offset calibration is performed in advance, the flat panel detector offset is set to be a fixed number of x millimeters, x is 1,2, … n, electronic imaging is performed, the difference of the column images when the flat panel detector has different offsets is recorded as a reference value, and the actually obtained difference of the column images is compared with the reference value to obtain the actual offset of the flat panel detector;
and when the actual offset is a non-integer, obtaining the offset by adopting an interpolation mode.
9. The flat panel detector position offset detecting method according to claim 6, wherein when the rotating gantry of the radiotherapy apparatus rotates to a 180 ° position, the actual flat panel detector position offset is calculated by:
obtaining the number of pixels occupied by the upright post image according to the size of each pixel of the flat panel detector, thereby calculating the size of the upright post image;
comparing the image of the detection tool on the flat panel detector obtained at the position of 180 degrees with the image obtained at the position of 0 degree,
if the distance between the flat panel detector and the ray source is unchanged and the size of the upright column image is unchanged, the flat panel detector has no position deviation;
if the distance between the flat panel detector and the ray source is shortened or the size of the upright post image is enlarged, the flat panel detector is subjected to position deviation, the size difference of the upright post image is obtained according to the compared image difference, the actual offset of the flat panel detector can be obtained due to the fact that the size of the upright post image is known,
or calibrating the offset of the flat panel detector in advance, setting the offset of the flat panel detector as a fixed number of x millimeters, wherein x is 1,2, … n, performing electronic imaging, recording the difference of the upright post images when the flat panel detector has different offsets as a reference value, and comparing the difference of the upright post images obtained actually with the reference value to obtain the actual offset of the flat panel detector.
10. Radiotherapy device, characterized in that it comprises a flat panel detector position offset detection tool according to any of claims 1 to 4; alternatively, the radiotherapy apparatus is used for implementing the flat panel detector position offset detection method according to any one of claims 5 to 9.
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