CN109350865B - Magnetic resonance guided imaging quality control phantom of radiotherapy system - Google Patents
Magnetic resonance guided imaging quality control phantom of radiotherapy system Download PDFInfo
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- CN109350865B CN109350865B CN201811420054.8A CN201811420054A CN109350865B CN 109350865 B CN109350865 B CN 109350865B CN 201811420054 A CN201811420054 A CN 201811420054A CN 109350865 B CN109350865 B CN 109350865B
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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
- A61N5/103—Treatment planning systems
- A61N5/1039—Treatment planning systems using functional images, e.g. PET or MRI
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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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- 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
- A61N2005/1055—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using magnetic resonance imaging [MRI]
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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
- A61N2005/1092—Details
Abstract
The invention discloses a magnetic resonance guided imaging quality control phantom of a radiotherapy system, wherein the diameters of a first cylindrical structure and a second cylindrical structure are 35-45cm, so that the requirement of large-range imaging detection of a special magnetic resonance radiotherapy simulation positioning system can be met. The diameters of the first cylindrical structure and the second cylindrical structure are 35-45cm, and the requirement of large-range imaging detection of the special magnetic resonance radiotherapy simulation positioning system can be met. The first part is hollow in the inside, the wedge blocks are arranged in an annular mode along the axis of the first cylindrical structure, the wedge structures are made of solid materials, and imaging is conducted in a magnetic resonance image to be used for testing the limit resolution of the magnetic resonance system. The test solution fills the interior of the first portion. The third part is a solid structure, a plurality of hole-shaped grooves with different diameters are arranged in the third part, and the third part is filled with test liquid and used for testing the spatial resolution of the magnetic resonance system. The hollow square cylinders of the second part and the fourth part are used for testing the geometric distortion of the magnetic resonance system in the magnetic resonance image.
Description
Technical Field
The invention belongs to the field of magnetic resonance radiotherapy, and particularly relates to a magnetic resonance guided imaging quality control phantom of a radiotherapy system.
Background
Magnetic resonance has good soft tissue contrast without ionizing radiation damage caused by X-rays. Is very suitable for the positioning imaging of the patient needing the radiation physical therapy. With the improvement of the multi-mode system integration technology, the integration of the magnet, the electron beam device and the cobalt 60 device is gradually realized. More and more integrated mri positioning systems are emerging and put into clinical use, for example: a Viewray device (0.35T magnetic field + cobalt 60 system), an MRI-Linac device (1.5T magnetic field 6MV Linac system), an independent large-aperture flat bed magnetic resonance system for positioning and the like.
Compared with the traditional magnetic resonance imaging system, the magnetic resonance radiotherapy simulation positioning system special for radiotherapy has the applicability and compatibility of radiotherapy. The special imaging system has unique design on hardware configurations such as an examination bed, a magnet aperture and a magnet length, and software configurations such as a scanning sequence and positioning software, and some related special imaging parameters appear. And the imaging of the magnetic resonance simulation positioning system is directly applied to the planning of the radiation treatment plan, and the imaging effect has direct relation with the radiation dose.
Under the condition, the quality control and treatment guarantee test work of the special magnetic resonance radiotherapy simulation positioning system has extremely important significance for radiation positioning and dosage guarantee. At present, complete and perfect magnetic resonance quality control and quality assurance detection phantoms are available at home and abroad, but the detection phantoms are not suitable for the quality detection of a special magnetic resonance radiotherapy simulation positioning system. For example: the special magnetic resonance radiotherapy simulation positioning system has an imaging area with a large aperture (larger than 60cm), and cannot meet the requirement of imaging detection in a large range for a common quality control phantom with the diameter of about 20 cm. Secondly, the examination bed of the special magnetic resonance radiotherapy simulation positioning system is of a flat plate type, and is provided with a special support frame for placing various scanning coils, so that the detection body model is required to be capable of performing targeted tests corresponding to different coil types. Most importantly, some dedicated radiotherapy-simulated localized magnetic resonance systems require an opening in the magnet to allow the electron beam of the linac to pass through, and this particular design cannot be tested using a small-sized phantom.
Disclosure of Invention
In view of the above technical problems in the prior art, it is an object of the present invention to provide an imaging quality control phantom for a magnetic resonance guided radiation therapy system. The phantom can meet the requirement of large-range imaging detection of a special magnetic resonance radiotherapy simulation positioning system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a magnetic resonance guided imaging quality control phantom of a radiotherapy system comprises four parts, namely a first part, a second part, a third part and a fourth part, wherein the four parts are all cylindrical structures, the first part and the third part form a first cylindrical structure, the second part and the fourth part form a second cylindrical structure, the first cylindrical structure and the second cylindrical structure are equal in diameter, and the length ratio of the first cylindrical structure to the second cylindrical structure is 1: 2.5-3.5; the diameters of the first cylindrical structure and the second cylindrical structure are 35-45 cm;
the combined surface of the first part and the third part is parallel to the axis of the first cylindrical structure, and the first part is larger than the third part; the combined surface of the second part and the fourth part is parallel to the axis of the first cylindrical structure, and the second part is larger than the fourth part;
the combined surface of the first part and the third part is superposed with the combined surface of the second part and the fourth part;
the first part is hollow, the interior of the first part comprises a plurality of wedge-shaped blocks which are completely the same, the wedge-shaped blocks are annularly arranged along the axis of the first cylindrical structure, and the tips of the wedge-shaped blocks face the axis;
the third part is a solid structure, a plurality of cylindrical grooves with different diameters are arranged in the third part, and the axes of the cylindrical grooves are parallel to the axis of the first cylindrical structure;
a plurality of hollow square cylinders are arranged in the second part and the fourth part, the square cylinders are parallel to the axis of the second cylindrical structure, and the square cylinders are arranged into a grid structure;
the outer walls and the inner structures of the first part, the second part, the third part and the fourth part are all made of materials which cannot generate magnetic resonance signals, and the four parts are all provided with water injection ports so as to inject test liquid.
The diameters of the first cylindrical structure and the second cylindrical structure are 35-45cm, and the requirement of large-range imaging detection of the special magnetic resonance radiotherapy simulation positioning system can be met.
The first part is hollow in the inside, the wedge blocks are arranged in an annular mode along the axis of the first cylindrical structure, the wedge structures are made of solid materials, and imaging is conducted in a magnetic resonance image to be used for testing the limit resolution of the magnetic resonance system. The test solution fills the interior of the first portion.
The third part is a solid structure, a plurality of hole-shaped grooves with different diameters are arranged in the third part, the hole-shaped grooves are hollow, and the third part is filled with test liquid and used for testing the spatial resolution of the magnetic resonance system.
The hollow square cylinders of the second part and the fourth part are used as basic geometric distortion testing units and used for testing the geometric distortion of the magnetic resonance system in the magnetic resonance image.
Preferably, the length of the first cylindrical structure is 8-12cm, and the length of the second cylindrical structure is 35-45 cm.
The length is adapted to the magnetic field center length of the magnetic resonance imaging.
Preferably, the first portion and the third portion have a width ratio of 3:1 in a direction perpendicular to a combined plane of the first portion and the third portion.
Preferably, the width ratio of the second portion to the fourth portion in a direction perpendicular to the combined surface of the second portion and the fourth portion is 3: 1.
Preferably, the angle of the wedge-shaped structures is 2 degrees, and the angle of the annular structures enclosed by the wedge-shaped structures is 180 degrees.
The angle of the annular structure formed by the wedge blocks is limited to 180 degrees, and the annular structure is used for testing the limit resolution.
For measuring the modulation transfer function MTF and the limit resolution.
Preferably, the outer walls and the inner structures of the first portion, the second portion, the third portion and the fourth portion are made of organic glass or 3D printing materials.
Preferably, the side length of the square column body is 0.8-1.2cm, and the wall thickness is 0.08-0.12 cm.
Further preferably, the number of the square columns is 90-120.
Preferably, the top plate, the bottom plate and the left and right side plates of the phantom are all provided with cross-shaped line marks. For laser positioning.
Further preferably, the cross-shaped line marks are etched or printed on the surface of the phantom.
Preferably, a hollow center line column is arranged at the central axis of the second cylindrical structure, and the material of the center line column is the same as that of the square column.
Preferably, a bubble level is arranged outside the phantom. To adjust the levelness of the phantom.
Preferably, the large-aperture test phantom contains a 3cm layer of pure water or overflow inside. For testing the signal-to-noise ratio and homogeneity of the magnetic resonance.
Preferably, the test solution is double distilled water, nickel chloride, sodium chloride or copper sulfate pentahydrate. And other standard test liquid for magnetic resonance can be replaced.
The invention has the beneficial effects that:
the diameters of the first cylindrical structure and the second cylindrical structure are 35-45cm, and the requirement of large-range imaging detection of the special magnetic resonance radiotherapy simulation positioning system can be met.
The first part is hollow in the inside, the wedge blocks are arranged in an annular mode along the axis of the first cylindrical structure, the wedge structures are made of solid materials, and imaging is conducted in a magnetic resonance image to be used for testing the limit resolution of the magnetic resonance system. The test solution fills the interior of the first portion.
The third part is a solid structure, a plurality of hole-shaped grooves with different diameters are arranged in the third part, the hole-shaped grooves are hollow, and the third part is filled with test liquid and used for testing the spatial resolution of the magnetic resonance system.
The hollow square cylinders of the second part and the fourth part are used as basic geometric distortion testing units and used for testing the geometric distortion of the magnetic resonance system in the magnetic resonance image.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Figure 1 is a perspective view structural schematic of a phantom of the invention;
figure 2 is a perspective view structurally schematic of another angle of the phantom of the present invention;
figure 3 is a front view structural schematic of the phantom of the present invention;
figure 4 is a back view structural schematic of the phantom of the present invention;
FIG. 5 is a side view schematic of the phantom of the present invention;
FIG. 6 is a schematic representation of the three-dimensional geometric distortion measurement of a large aperture test phantom of the present invention;
FIG. 7 is a three-dimensional geometric distortion measurement display of the large aperture test phantom of the present invention.
The device comprises a first part, a second part, a third part, a fourth part, a central line column, a square column 7, a column groove, a wedge block 8 and a first part, 2, the second part, 3, the third part, 4, the fourth part, 5.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 and 5, an imaging quality control phantom of a magnetic resonance guided radiotherapy system comprises four parts, namely a first part 1, a second part 2, a third part 3 and a fourth part 4, wherein the four parts are cylindrical structures, the first part 1 and the third part 3 form a first cylindrical structure, the second part 2 and the fourth part 4 form a second cylindrical structure, the first cylindrical structure and the second cylindrical structure have the same diameter, and the length ratio of the first cylindrical structure to the second cylindrical structure is 1: 2.5-3.5; the diameters of the first cylindrical structure and the second cylindrical structure are 35-45cm, the length of the first cylindrical structure is 8-12cm, and the length of the second cylindrical structure is 35-45cm, so that the magnetic field center length of magnetic resonance imaging is adapted.
The combined plane of the first portion 1 and the third portion 3 is parallel to the axis of the first cylindrical structure, and the first portion 1 is larger than the third portion 3, and the width ratio of the first portion 1 and the third portion 3 in a direction perpendicular to the combined plane of the first portion 1 and the third portion 3 is 3: 1.
The combined surface of the second part 2 and the fourth part 4 is parallel to the axis of the first cylindrical structure, and the second part 2 is larger than the fourth part 4; the width ratio of the second portion 2 to the fourth portion 4 in a direction perpendicular to the combined surface of the second portion 2 and the fourth portion 4 is 3: 1.
As shown in fig. 2 and 4, the combined surface of the first part 1 and the third part 3 coincides with the combined surface of the second part 2 and the fourth part 4; the first part 1 is hollow, the interior of the first part 1 comprises a plurality of wedge-shaped blocks 8, the wedge-shaped blocks 8 are completely the same, the wedge-shaped blocks 8 are annularly arranged along the axis of the first cylindrical structure, and the tips of the wedge-shaped blocks 8 face the axis; the angle of the wedge-shaped block 8 is 2 degrees, and the angle of the annular structure formed by the wedge-shaped block 8 is 180 degrees. The angle of the ring-shaped structure enclosed by the wedge-shaped blocks 8 is defined as 180 degrees for testing the limit resolution.
The third part 3 is a solid structure, a plurality of cylindrical grooves 7 with different diameters are arranged in the third part, and the axes of the cylindrical grooves 7 are parallel to the axis of the first cylindrical structure;
as shown in fig. 3, a plurality of hollow square cylinders 6 are arranged inside the second part 2 and the fourth part 4, the square cylinders 6 are arranged in parallel with the axis of the second cylindrical structure, and the plurality of square cylinders are arranged into a grid structure; the side length of the square column 6 is 0.8-1.2cm, and the wall thickness is 0.08-0.12 cm. The number of the square columns 6 is 90-120.
The outer walls and the inner structures of the first part 1, the second part 2, the third part 3 and the fourth part 4 are all made of materials which cannot generate magnetic resonance signals, and the four parts are all provided with water injection ports to inject test liquid.
The diameters of the first cylindrical structure and the second cylindrical structure are 35-45cm, and the requirement of large-range imaging detection of the special magnetic resonance radiotherapy simulation positioning system can be met. The first part is hollow in the inside, the wedge blocks 8 are annularly arranged along the axis of the first cylindrical structure, and the wedge structures are made of solid materials and are imaged in a magnetic resonance image to be used for testing the limit resolution of the magnetic resonance system. The test solution fills the interior of the first portion. The third part is a solid structure, a plurality of hole-shaped grooves with different diameters are arranged in the third part, the hole-shaped grooves are hollow, and the third part is filled with test liquid and used for testing the spatial resolution of the magnetic resonance system. The hollow square cylinders of the second part and the fourth part are used as basic geometric distortion testing units and used for testing the geometric distortion of the magnetic resonance system in the magnetic resonance image.
The outer walls and the inner structures of the first part 1, the second part 2, the third part 3 and the fourth part 4 are made of organic glass or 3D printing materials.
The top plate, the bottom plate and the left and right side plates of the phantom are all provided with cross-shaped line marks for laser positioning, and the cross-shaped line marks are etched or printed on the surface of the phantom.
The central axis position of the second cylindrical structure is provided with a hollow central line column, and the material of the central line column is the same as that of the square column body 6. And a bubble level gauge is arranged outside the phantom to adjust the levelness of the phantom.
The large-pore test phantom contained a 3cm pure water layer or overflow layer inside. For testing the signal-to-noise ratio and homogeneity of the magnetic resonance.
The test solution can be double distilled water, nickel chloride, sodium chloride or blue copperas.
The upper half part of the large-aperture test phantom can be independently used for a magnetic resonance guided radiotherapy system with a flat-bed examination positioning bed. The upper part and the lower part can be combined to be used for a magnetic resonance system with an arc-shaped examination bed.
The large-aperture test phantom is mainly filled with a magnetic resonance test solution except for an internal solid structure. The test solution can be replaced through the bolt ports at the two ends of the phantom.
On the magnetic resonance scanning image of the phantom, a matrix grid image (grid forms a dark grid without signal, surrounding test liquid light signal) and a point cloud image (grid forms a dark point without signal, surrounding test liquid light signal) can be formed at specific positions of the transverse plane, the sagittal plane and the coronal plane.
The grid columnar structures are connected in a mortise and tenon mode at the intersection points of the grids, and if the grids are printed in a 3D mode, the grids can be integrally printed without connection.
The grid structure is provided with a thickened central line columnar structure mark at the central line position of the phantom cylinder, and a thickened columnar grid or point-shaped image can be formed on the scanned image transversely. To identify the phantom physical center.
The large-aperture test phantom contains a 3cm pure water layer or overflow layer inside for testing the signal-to-noise ratio and the uniformity of magnetic resonance.
Inside triangle organic glass or the 3D who contains 45 degrees diagonal slopes of large aperture test phantom prints the material structure, the structure has three groups, and the quadrature is placed for carry out the space positioning accuracy test at cross section, sagittal plane and coronal plane.
The inside organic glass or the 3D who contains the long slope of 30 degrees of large aperture test phantom prints the material structure for test magnetic resonance scanning layer thickness and layer deviation.
The inside star type test structure that contains of large aperture test phantom specifically is 2 degrees wedge shaped organic glass or 3D prints the material structure, and the circumference is placed for measure modulation transfer function MTF and limit resolution.
The large-aperture test phantom is matched with a 3D digital dot matrix model and is stored in the form of on-line software and mode following software. After the DICOM browser or image reading software is opened, the selection of any FOV of any layer can be realized. The large-aperture test body model image obtained by user scanning can register and fuse the corresponding FOV model of the digital dot matrix model with the actual image of the body model by reading the visual field and matrix information in a DICOM file header, contrasts and displays the difference between the actual grid and dot matrix positions and the image grid and dot matrix positions, quantitatively analyzes the spatial offset of the corresponding positions, and deduces the field deviation. And the geometric distortion caused by the field deviation is visually displayed through two-color display or 3D space display.
As shown in fig. 6 and 7, the large-aperture test phantom is matched with 3D digital processing software, and the quality control test layer image in the sequence image can be automatically determined by retrieving the DICOM sequence image of the phantom and automatically identifying the information such as the layer thickness and the matrix in the positioning block of the phantom and the DICOM image on the computer. And automatically identifying the grid or point cloud signals in the quality control test layer image, determining the centroid or geometric center of a grid vertex angle or point by using a projection mode, and simultaneously determining the center of a phantom/image, the FOV and the image range 22.5cm/17.5cm/10cm away from the center. The digital processing software automatically measures the difference between the point images with different distances from the center of the phantom/image and the real position, and indicates the difference in three different directions by different signals or colors. The variation of field strength or geometric distortion within the FOV of the phantom measurement is represented in graphical form.
The 3D digital dot matrix model can calculate the brightness amplitude of the water signal of the phantom, and the FOV model corresponding to the digital dot matrix model is registered and fused with the actual image of the phantom to compare the signal difference of each space position in the displayed image by pseudo color so as to compare the signal amplitude and the signal-to-noise ratio of the multi-channel coil changing along with the space position.
The large-aperture test body model test solution and various internal structures can be scanned and imaged under CT at the same time, and can be applied to the quality control and quality assurance of CT-guided radiotherapy systems.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An imaging quality control phantom of a magnetic resonance guided radiation therapy system, characterized in that: the cylindrical structure comprises four parts, namely a first part, a second part, a third part and a fourth part, wherein the four parts are all cylindrical structures, the first part and the third part form a first cylindrical structure, the second part and the fourth part form a second cylindrical structure, the first cylindrical structure and the second cylindrical structure are equal in diameter, and the length ratio of the first cylindrical structure to the second cylindrical structure is 1: 2.5-3.5; the diameters of the first cylindrical structure and the second cylindrical structure are 35-45 cm;
the combined surface of the first part and the third part is parallel to the axis of the first cylindrical structure, and the first part is larger than the third part; the combined surface of the second part and the fourth part is parallel to the axis of the first cylindrical structure, and the second part is larger than the fourth part;
the combined surface of the first part and the third part is superposed with the combined surface of the second part and the fourth part;
the first part is hollow, the interior of the first part comprises a plurality of wedge-shaped blocks which are completely the same, the wedge-shaped blocks are annularly arranged along the axis of the first cylindrical structure, and the tips of the wedge-shaped blocks face the axis;
the third part is a solid structure, a plurality of cylindrical grooves with different diameters are arranged in the third part, and the axes of the cylindrical grooves are parallel to the axis of the first cylindrical structure;
a plurality of hollow square cylinders are arranged in the second part and the fourth part, the square cylinders are parallel to the axis of the second cylindrical structure, and the square cylinders are arranged into a grid structure;
the outer walls and the inner structures of the first part, the second part, the third part and the fourth part are all made of materials which cannot generate magnetic resonance signals, and the four parts are all provided with water injection ports so as to inject test liquid.
2. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the length of the first cylindrical structure is 8-12 cm.
3. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the width ratio of the first portion to the third portion in a direction perpendicular to a combined face of the first portion and the third portion is 3: 1.
4. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the width ratio of the second portion to the fourth portion in a direction perpendicular to the combined face of the second portion and the fourth portion is 3: 1.
5. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the angle of the wedge-shaped structure is 2 degrees, and the angle of the annular structure enclosed by the wedge-shaped structure is 180 degrees.
6. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the outer walls and the inner structures of the first part, the second part, the third part and the fourth part are made of organic glass or 3D printing materials.
7. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the side length of the square column body is 0.8-1.2cm, the wall thickness is 0.08-0.12cm, and the number of the square column bodies is 90-120.
8. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: the top plate, the bottom plate and the left and right side plates of the phantom are all provided with cross-shaped line marks, and the cross-shaped line marks are etched or printed on the surface of the phantom.
9. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: and a hollow center line column is arranged at the position of the central axis of the second cylindrical structure, and the material of the center line column is the same as that of the square column body.
10. The magnetic resonance guided radiation therapy system imaging quality control phantom according to claim 1, characterized in that: and a bubble level gauge is arranged outside the phantom.
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| CN201811420054.8A CN109350865B (en) | 2018-11-26 | 2018-11-26 | Magnetic resonance guided imaging quality control phantom of radiotherapy system |
| AU2019388593A AU2019388593B2 (en) | 2018-11-26 | 2019-11-25 | Radiotherapy system imaging quality control phantom guided by magnetic resonance |
| PCT/CN2019/120750 WO2020108459A1 (en) | 2018-11-26 | 2019-11-25 | Radiotherapy system imaging quality control phantom guided by magnetic resonance |
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| WO2020168525A1 (en) * | 2019-02-21 | 2020-08-27 | 西安大医集团股份有限公司 | Radiotherapy system and verification device and verification method thereof |
| CN110811621B (en) * | 2019-11-12 | 2023-06-23 | 山东第一医科大学(山东省医学科学院) | Magnetic resonance diffusion tensor imaging quality control comprehensive test phantom |
| CN111529968B (en) * | 2020-05-20 | 2022-05-06 | 江苏准成测量工程研究院有限公司 | Detection method for MRI positioning gamma knife treatment precision |
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| GB8405065D0 (en) * | 1984-02-27 | 1984-04-04 | Picker Int Ltd | Nuclear magnetic resonance imaging apparatus |
| JPH02152441A (en) * | 1988-12-05 | 1990-06-12 | Hitachi Medical Corp | Phantom for evaluating strain of mri image |
| RU2637289C2 (en) * | 2012-03-28 | 2017-12-01 | Конинклейке Филипс Н.В. | Device and method for quality control in planning of radiation therapy based on magnetic resonance |
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| CN108572341A (en) * | 2017-03-08 | 2018-09-25 | 安徽省立医院 | A kind of magnetic resonance imaging system quality control multi-parameter die body |
| CN109350865B (en) * | 2018-11-26 | 2020-06-09 | 泰山医学院 | Magnetic resonance guided imaging quality control phantom of radiotherapy system |
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