A test device and method for a cross image system

Abstract

The application discloses a kind of test device and method for cross image system, belong to radiotherapy equipment technical field.A kind of test device for cross image system, including two guide rails, two guide rails are arranged in cross shape, and rotationally connected, the intersection of two guide rails is equipped with phantom test platform, phantom test platform is installed on one of guide rails, phantom test platform is used to place phantom main body, the spatial position of phantom test platform can be adjusted, X-ray tube support and flat panel detector support are slidably connected on guide rail, X-ray tube support and flat panel detector support are located phantom test platform two sides respectively, X-ray tube support is used to install X-ray tube main body, the installation angle and position of X-ray tube main body on X-ray tube support can be adjusted, flat panel detector support is used to install flat panel detector main body, the installation angle and position of flat panel detector main body on flat panel detector support can be adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radiotherapy equipment, more particularly, to a testing device and method for a cross-image system. BACKGROUND

[0002] With the development of medical imaging equipment technology, imaging equipment is applied to medical diagnosis and patient treatment. In the application of radiotherapy equipment, medical imaging equipment can be used to locate the tumor site of a patient. The cross-image system applied to a gamma knife radiotherapy equipment adopts an intersection angle stereoscopic planar imaging technology. Through a computer control of two groups of imaging hardware systems composed of KV-level (diagnostic level) X-ray tube assemblies, high-voltage generators, flat panel detectors, and exposure controllers, the anatomic structure or external implanted markers of a patient are projected in two directions, and a pair of intersection angle X-ray projection images are obtained. The obtained two-dimensional X-ray projection images and three-dimensional CT images used for radiotherapy planning are subjected to 2D-3D image registration and 2D-3D geometric conversion, so as to accurately detect the positioning error of the patient (lesion) on the radiotherapy equipment. Accordingly, the radiotherapy equipment moves the treatment bed to correct the position of the patient, and realizes accurate positioning of the patient before treatment. At present, when the cross-image system is mounted on a gamma knife device for use, it is necessary to ensure the lowest exposure dose while ensuring image quality, because the exposure dose is harmful to the patient.

[0003] After searching, the patent document with the publication number CN112914591A provides an image-guided system calibration device and method. The method quickly completes the initial position installation of the flat panel detector based on the laser beam and the model light channel, realizes the accurate positioning of the flat panel detector installation position based on the X-ray and the marker (metal ball), and finally realizes the confirmation and verification of the final position of the flat panel detector through registration.

[0004] The above-mentioned method is only applicable to the calibration of one group of imaging equipment, and cannot be applied to the calibration of a cross-image system. In view of this, we propose a testing device and method for a cross-image system. SUMMARY

[0005] 1. Technical problem to be solved

[0006] The purpose of the present application is to provide a testing device and method for a cross-image system to solve the problems raised in the background art.

[0007] 2. Technical solution

[0008] The present application is achieved by the following technical solutions:

[0009] A kind of test device for cross image system, including two guide rails, two the guide rail is arranged in cross shape and is rotationally connected, the intersection of two the guide rail is equipped with phantom test platform, the phantom test platform is installed on one of the guide rails, the phantom test platform is used to place phantom body, the spatial position of the phantom test platform can be adjusted, X-ray tube support and flat panel detector support are slidably connected on the guide rail, the X-ray tube support and flat panel detector support are located phantom test platform two sides respectively, the X-ray tube support is used to install X-ray tube body, the installation angle and position of the X-ray tube body on the X-ray tube support can be adjusted, the flat panel detector support is used to install flat panel detector body, the installation angle and position of the flat panel detector body on the flat panel detector support can be adjusted.

[0010] A kind of test method for cross image system, comprising the following steps:

[0011] S1, install X-ray tube body on X-ray tube support, install flat panel detector body on flat panel detector support, and position X-ray tube body and flat panel detector body on guide rail;

[0012] S2, place phantom body on phantom test platform, and adjust the position of phantom body;

[0013] S3, according to the initial voltage and current of X-ray tube body and exposure time parameter, control X-ray tube body to emit beam, and form planar image on flat panel detector body;

[0014] S4, adjust the distance between X-ray tube body and phantom body and the distance between X-ray tube body and flat panel detector body to obtain planar image meeting the first standard, and record the distance between X-ray tube body and phantom body and the distance between X-ray tube body and flat panel detector body at this time;

[0015] S5, control two X-ray tube bodies to emit beam, form planar image on two flat panel detector bodies, and generate three-dimensional phantom model using two planar images;

[0016] S6, adjust the included angle between two guide rails to obtain three-dimensional phantom model meeting the second standard, and record the included angle between two guide rails at this time;

[0017] S7, adjust X-ray tube body voltage and current and exposure time parameter within the range allowed by imaging dose to obtain three-dimensional phantom model meeting the second standard, and record X-ray tube body voltage and current and exposure time parameter at this time;

[0018] S8, according to the interval between the X-ray tube body and the phantom body, the interval between the X-ray tube body and the flat panel detector body, the included angle between the two guide rails, the X-ray tube body voltage and current and the exposure time parameters, the X-ray tube body and the flat panel detector body are installed and debugged.

[0019] As an optional solution of the technical scheme of the present application file, the S1 comprises the following sub-steps:

[0020] S101, a cross laser lamp is installed at the beam exit of the X-ray tube body;

[0021] S102, the flat panel detector body is adjusted so that the projection of the cross laser lamp on the flat panel detector body is aligned with the cross reticle on the flat panel detector body panel.

[0022] As an optional solution of the technical scheme of the present application file, the S2 comprises the following sub-steps:

[0023] S201, a three-dimensional phantom model of the phantom body is generated by using the planar image projected on the two flat panel detector bodies, and the phantom center coordinates of the three-dimensional phantom model are obtained;

[0024] S202, the focal point coordinates of the two X-ray tube bodies are obtained in the coordinate system where the three-dimensional phantom model is located, and the error distance between the phantom center coordinates and the focal point coordinates is calculated;

[0025] S203, the position of the phantom body is adjusted until the error distance is less than the set error threshold.

[0026] As an optional solution of the technical scheme of the present application file, the error threshold is 0.5mm.

[0027] As an optional solution of the technical scheme of the present application file, the interval between the X-ray tube body and the phantom body is 1500mm-2100mm, and the interval between the X-ray tube body and the flat panel detector body is 3000mm.

[0028] As an optional solution of the technical scheme of the present application file, the included angle between the guide rails is 70°-110°.

[0029] As an optional solution of the technical scheme of the present application file, the voltage is 100KV-140KV.

[0030] As an optional solution of the technical scheme of the present application file, the current is 100mA-200mA.

[0031] As an optional solution of the technical scheme of the present application file, the exposure time is 0.05s-0.1s.

[0032] 3. Advantages

[0033] Compared with the prior art, the advantages of the present application are:

[0034] 1) The present application can adjust the angle between the two X-ray tube bodies in the cross image system by setting two guide rails in a cross shape, for testing the imaging quality of the cross image system at different angles, solving the defect that the prior art can only calibrate a group of image devices.

[0035] 2) The present application can obtain the use parameters of the X-ray tube body and the flat panel detector body by testing the different SAD values, SID values, θ values, and voltage values and current values of the X-ray tube body in sequence, and exposure time, guiding the installation and debugging of the X-ray tube body and the flat panel detector. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a whole structure schematic view of a testing device for a cross image system;

[0037] Figure 2 is a schematic view of the plane arrangement structure of an X-ray tube body of a testing device for a cross image system;

[0038] In the figure: 1, guide rail; 101, X-ray tube support; 102, flat panel detector support; 103, X-ray tube body; 104, flat panel detector body; 2, phantom test platform; 3, phantom body. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in combination with the drawings.

[0040] Example 1:

[0041] Please refer to Figure 1 , the present application provides a testing device for a cross image system, comprising two guide rails 1, the two guide rails 1 are arranged in a cross shape and are rotationally connected, a phantom test platform 2 is arranged at the intersection of the two guide rails 1, the phantom test platform 2 is installed on one of the guide rails 1, the phantom test platform 2 is used for placing a phantom body 3, the spatial position of the phantom test platform 2 can be adjusted, an X-ray tube support 101 and a flat panel detector support 102 are slidably connected on the guide rail 1, the X-ray tube support 101 and the flat panel detector support 102 are respectively located on both sides of the phantom test platform 2, the X-ray tube support 101 is used for installing an X-ray tube body 103, the installation angle and position of the X-ray tube body 103 on the X-ray tube support 101 can be adjusted, the flat panel detector support 102 is used for installing a flat panel detector body 104, the installation angle and position of the flat panel detector body 104 on the flat panel detector support 102 can be adjusted.

[0042] In the device, the X-ray tube body 103 can be installed by the X-ray tube support 101, the flat panel detector body 104 can be installed by the flat panel detector support 102, and the distance SAD between the X-ray tube body 103 and the phantom body 3 and the distance SID between the X-ray tube body 103 and the flat panel detector body 104 can be adjusted by moving the X-ray tube support 101 and the flat panel detector support 102; the included angle θ between the two X-ray tube bodies 103 can be changed by relatively rotating the two rails 1; the spatial position of the phantom body 3 in the cross image system can be adjusted by the phantom test platform 2; and the user can calibrate different X-ray tube bodies 103 and flat panel detector bodies 104 by the device to obtain appropriate SAD values, SID values, θ values, and voltage values and current values of the X-ray tube body 103 and exposure time, which are used to guide the installation of the X-ray tube body 103 and the flat panel detector body 104.

[0043] Embodiment 2:

[0044] The application provides a test method for a cross image system, which is applied to the test device for the cross image system described in embodiment 1 and includes the following steps:

[0045] S1, the X-ray tube body 103 is installed on the X-ray tube support 101, the flat panel detector body 104 is installed on the flat panel detector support 102, and the X-ray tube body 103 and the flat panel detector body 104 on the rail 1 are positioned;

[0046] S2, the phantom body 3 is placed on the phantom test platform 2, and the position of the phantom body 3 is adjusted;

[0047] S3, the X-ray tube body 103 is controlled to emit beams according to the initial voltage, current and exposure time parameters of the X-ray tube body 103, and a planar image is formed on the flat panel detector body 104;

[0048] S4, the distance between the X-ray tube body 103 and the phantom body 3 and the distance between the X-ray tube body 103 and the flat panel detector body 104 are adjusted to obtain a planar image meeting the first standard, and the distance between the X-ray tube body 103 and the phantom body 3 and the distance between the X-ray tube body 103 and the flat panel detector body 104 at this time are recorded;

[0049] S5, the two X-ray tube bodies 103 are controlled to emit beams, planar images are formed on the two flat panel detector bodies 104, and a three-dimensional phantom model is generated by using the two planar images;

[0050] S6, adjust the included angle between the two guide rails 1 to obtain a three-dimensional phantom model meeting the second standard, and record the included angle between the two guide rails 1 at this time;

[0051] S7, within the range allowed by the imaging dose, adjust the X-ray tube body 103 voltage and current and exposure time parameters to obtain a three-dimensional phantom model meeting the second standard, and record the X-ray tube body 103 voltage and current and exposure time parameters at this time;

[0052] S8, according to the recorded distance between the X-ray tube body 103 and the phantom body 3, the distance between the X-ray tube body 103 and the flat panel detector body 104, the included angle between the two guide rails 1, and the X-ray tube body 103 voltage and current and exposure time parameters, install and debug the X-ray tube body 103 and the flat panel detector body 104.

[0053] In the above method, the second standard and the second standard both use the relevant provisions in the national standard YY1650-2019, the national standard YY1650-2019, and the national standard YY0741-2009.

[0054] S1 includes the following sub-steps:

[0055] S101, install a cross laser lamp at the beam exit of the X-ray tube body 103;

[0056] S102, adjust the flat panel detector body 104 so that the projection of the cross laser lamp on the flat panel detector body 104 is aligned with the crosshair on the panel of the flat panel detector body 104.

[0057] S2 includes the following sub-steps:

[0058] S201, generate a three-dimensional phantom model of the phantom body 3 using the planar images of the phantom body 3 projected on the two flat panel detector bodies 104, and obtain the phantom center coordinates of the three-dimensional phantom model;

[0059] S202, obtain the focal point coordinates of the two X-ray tube bodies 103 in the coordinate system of the three-dimensional phantom model, and calculate the error distance between the phantom center coordinates and the focal point coordinates.

[0060] S203, adjust the position of the phantom body 3 until the error distance is less than the set error threshold, and the error threshold is 0.5 mm.

[0061] The experimental data obtained by using the above method are as follows:

[0062] Table 1: SID=3000, SAD / SID=0.5

[0063]

[0064] Table II: SID = 3000, SAD / SID = 0.6

[0065]

[0066] Table III: SID = 3000, SAD / SID = 0.7

[0067]

[0068] Wherein, the imaging quality of A refers to the imaging quality of the three-dimensional phantom model, and the judging standard is as follows:

[0069]

[0070] From the above experimental data, it can be seen that the distance between the X-ray tube body 103 and the phantom body 3 is 1500mm-2100mm, the distance between the X-ray tube body 103 and the flat panel detector body 104 is 3000mm, the included angle between the guide rails 1 is 70°-110°, the voltage is 100KV-140KV, the current is 100mA-200mA, the exposure time is 0.05s-0.1s, and a clear three-dimensional phantom model can be obtained.

Claims

1. A test device for a cross image system, characterized by: It includes: two guide rails (1), two said guide rail (1) is cross-shaped arrangement and rotating connection, two said guide rail (1) is equipped with the intersection of the test platform (2) of die body, the test platform (2) is installed on one of the guide rail (1), the test platform (2) is used to place the die body (3), the spatial position of the test platform (2) can be adjusted, the guide rail (1) is slidably connected with X-ray tube bracket (101) and flat panel detector bracket (102), the X-ray tube bracket (101) and flat panel detector bracket (102) are located on both sides of the test platform (2) of die body, the X-ray tube bracket (101) is used to install the X-ray tube body (103), the installation angle and position of the X-ray tube body (103) on the X-ray tube bracket (101) can be adjusted, the flat panel detector bracket (102) is used to install the flat panel detector body (104), the installation angle and position of the flat panel detector body (104) on the flat panel detector bracket (102) can be adjusted.

2. A testing method for a cross image system, applied to the testing device for a cross image system as claimed in claim 1, characterized in that: It includes the following steps: S1, the X-ray tube body (103) is installed on the X-ray tube bracket (101), the flat panel detector body (104) is installed on the flat panel detector bracket (102), and the X-ray tube body (103) and the flat panel detector body (104) on the guide rail (1) are positioned; S2, the die body (3) is placed on the test platform (2) of die body, and the position of the die body (3) is adjusted; S3, according to the initial voltage and current of the X-ray tube body (103) and the exposure time parameter, the X-ray tube body (103) is controlled to emit beam, and the planar image is formed on the flat panel detector body (104); S4, the distance between the X-ray tube body (103) and the die body (3) and the distance between the X-ray tube body (103) and the flat panel detector body (104) are adjusted to obtain the planar image meeting the first standard, and the distance between the X-ray tube body (103) and the die body (3) and the distance between the X-ray tube body (103) and the flat panel detector body (104) at this time are recorded; S5, control two X-ray tube body (103) to emit beam, form planar image on two flat panel detector body (104), and generate three-dimensional die body model by using two planar images; S6, the included angle between the two guide rails (1) is adjusted to obtain the three-dimensional die body model meeting the second standard, and the included angle between the two guide rails (1) at this time is recorded; S7, within the range allowed by the imaging dose, the X-ray tube body (103) voltage and current and exposure time parameters are adjusted to obtain the three-dimensional die body model meeting the second standard, and the X-ray tube body (103) voltage and current and exposure time parameters at this time are recorded. S8, according to the recorded distance between the X-ray tube body (103) and the phantom body (3), the distance between the X-ray tube body (103) and the flat panel detector body (104), the included angle between the two guide rails (1), the voltage and current of the X-ray tube body (103) and the exposure time parameter, the X-ray tube body (103) and the flat panel detector body (104) are installed and debugged.

3. A method of testing a cross image system according to claim 2, wherein: The S1 comprises the following sub-steps: S101, a cross laser lamp is installed at the beam exit of the X-ray tube body (103); S102, the flat panel detector body (104) is adjusted so that the projection of the cross laser lamp on the flat panel detector body (104) is aligned with the cross reticle on the panel of the flat panel detector body (104).

4. The method of claim 2, wherein: The S2 comprises the following sub-steps: S201, a three-dimensional phantom model of the phantom body (3) is generated by using the planar image projected on the two flat panel detector bodies (104), and the center coordinates of the three-dimensional phantom model are obtained; S202, the focal point coordinates of the two X-ray tube bodies (103) are obtained in the coordinate system of the three-dimensional phantom model, and the error distance between the center coordinates and the focal point coordinates is calculated; S203, the position of the phantom body (3) is adjusted until the error distance is less than the set error threshold.

5. A method of testing a cross image system according to claim 4, wherein: The error threshold is 0.5mm.

6. The method of claim 2, wherein: The distance between the X-ray tube body (103) and the phantom body (3) is 1500mm-2100mm, and the distance between the X-ray tube body (103) and the flat panel detector body (104) is 3000mm.

7. The method of claim 2, wherein: The included angle between the guide rails (1) is 70°-110°.

8. The method of claim 2, wherein: The voltage is 100KV-140KV.

9. The method of claim 2, wherein: The current is 100mA-200mA.

10. The method of claim 2, wherein: The exposure time is 0.05s-0.1s.

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