WO2020108459A1 - 一种磁共振引导的放射治疗系统成像质量控制体模 - Google Patents

一种磁共振引导的放射治疗系统成像质量控制体模 Download PDF

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WO2020108459A1
WO2020108459A1 PCT/CN2019/120750 CN2019120750W WO2020108459A1 WO 2020108459 A1 WO2020108459 A1 WO 2020108459A1 CN 2019120750 W CN2019120750 W CN 2019120750W WO 2020108459 A1 WO2020108459 A1 WO 2020108459A1
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magnetic resonance
cylindrical structure
phantom
quality control
imaging quality
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French (fr)
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邱建峰
戎懿
曹旻松
陈迢
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山东第一医科大学(山东省医学科学院)
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Priority to AU2019388593A priority Critical patent/AU2019388593B2/en
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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
    • 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
    • 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]
    • 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

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  • the invention belongs to the field of magnetic resonance radiotherapy, and particularly relates to a magnetic resonance guided radiotherapy system imaging quality control phantom.
  • Magnetic resonance has good soft tissue contrast, and no ionizing radiation damage caused by X-rays. It is very suitable for positioning imaging of patients who need radiation physiotherapy. With the improvement of multi-modal system integration technology, the integration of magnets, electron beam equipment, and cobalt 60 equipment has gradually been realized. More and more integrated magnetic resonance radiotherapy simulation positioning systems are released and put into clinical application, such as: ViewRay equipment (0.35T magnetic field + cobalt 60 system), MRI-Linac equipment (1.5T magnetic field 6MV Linac system) and independent positioning Use a large aperture flat bed magnetic resonance system, etc.
  • the magnetic resonance radiotherapy simulation positioning system dedicated to radiotherapy has the applicability and compatibility of radiotherapy. It has unique design in hardware configuration such as examination table, magnet aperture, magnet length, etc., as well as scan sequence, positioning software and other software configurations, and some related special imaging parameters appear accordingly. And the imaging of the magnetic resonance simulation positioning system will be directly applied to the formulation of radiotherapy planning, and its imaging effect has a direct relationship with the radiation dose.
  • the quality control and treatment assurance testing of the dedicated magnetic resonance radiotherapy simulation positioning system are of great significance for radiation positioning and dose assurance.
  • these testing phantoms are not suitable for the quality testing of the special magnetic resonance radiotherapy simulation positioning system.
  • the dedicated magnetic resonance radiotherapy simulation positioning system has an imaging area with a large aperture (greater than 60 cm).
  • a common quality control phantom with a diameter of about 20 cm it cannot meet the needs of imaging detection in a wide range.
  • the examination bed of the special magnetic resonance radiotherapy simulation positioning system is a flat type, and a special support frame is placed to place various scanning coils, which requires that the test phantom can be targeted for different coil types for targeted testing.
  • the most important thing is that some special radiotherapy simulation positioning magnetic resonance systems require magnets to have openings to facilitate the passage of the electron beam of the linear accelerator. This special design cannot be tested with a small-sized detection phantom.
  • the object of the present invention is to provide an imaging quality control phantom for a magnetic resonance guided radiotherapy system.
  • the phantom can meet the needs of large-scale imaging detection of a dedicated magnetic resonance radiotherapy simulation positioning system.
  • the technical solutions of the present invention are:
  • a magnetic resonance guided radiotherapy system imaging quality control phantom including four parts, namely a first part, a second part, a third part and a fourth part, all of which are cylindrical structures, the first part and the third Part constitutes the first cylindrical structure, the second part and the fourth part constitute the second cylindrical structure, the first cylindrical structure and the second cylindrical structure have the same diameter, and the length ratio is 1:2.5-3.5; the first cylinder The diameter of the shaped structure and the second cylindrical structure is 35-45cm;
  • 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, the second part Greater than the fourth part;
  • the combined surface of the first and third parts coincides with the combined surface of the second and fourth parts;
  • the inner part of the first part is hollow, and the inside includes a plurality of wedge-shaped blocks, the plurality of wedge-shaped blocks are identical, the wedge-shaped blocks are arranged in a ring along the axis of the first cylindrical structure, and the tip of the wedge-shaped block faces the axis;
  • the third part is the solid structure, which is provided with a number of cylindrical grooves with different diameters, the axis of the cylindrical groove is parallel to the axis of the first cylindrical structure;
  • Both the second part and the fourth part are provided with a plurality of hollow square cylinders, the square cylinders are arranged parallel to the axis of the second cylindrical structure, and several square cylinders are arranged in a grid-like structure;
  • the outer walls and internal structures of the first part, second part, third part, and fourth part are made of materials that do not generate magnetic resonance signals, and these four parts are provided with water injection ports to inject the test liquid.
  • the diameter of the first cylindrical structure and the second cylindrical structure is 35-45 cm, which can meet the needs of imaging detection in a wide range of the dedicated magnetic resonance radiotherapy simulation positioning system.
  • the inner part of the first part is hollow, and the wedge-shaped blocks are arranged in a ring along the axis of the first cylindrical structure.
  • the wedge-shaped structure is a solid material, which is imaged in a magnetic resonance image and used to test the limit resolution of the magnetic resonance system.
  • the test solution fills the inside of the first part.
  • the third part is the solid structure.
  • the hole-shaped grooves are hollow and filled with test liquid, which is used to test the spatial resolution of the magnetic resonance system.
  • the hollow square cylinders in the second and fourth parts are used as the basic geometric distortion test unit to test the geometric distortion of the magnetic resonance system in the magnetic resonance image.
  • the length of the first cylindrical structure is 8-12 cm, and the length of the second cylindrical structure is 35-45 cm.
  • the length is suitable for the magnetic field center length of magnetic resonance imaging.
  • the width ratio of the first part and the third part is 3:1.
  • the width ratio of the second part and the fourth part is 3:1.
  • the angle of the wedge-shaped structure is 2°, and the angle of the ring-shaped structure enclosed by the wedge-shaped structure is 180°.
  • the angle of the ring structure enclosed by the wedge block is limited to 180°, which is used to test the limit resolution.
  • the materials of the outer wall and internal structure of the first part, the second part, the third part, and the fourth part are organic glass or 3D printing materials.
  • the side length of the square cylinder is 0.8-1.2 cm, and the wall thickness is 0.08-0.12 cm.
  • the number of the square pillars is 90-120.
  • the top plate, the bottom plate and the left and right side plates of the phantom are all provided with cross-shaped line marks. Used for laser positioning.
  • the cross-shaped line mark is etched or printed on the surface of the phantom.
  • a hollow centerline column is provided at the central axis of the second cylindrical structure, and the material of the centerline column is the same as the material of the square column.
  • a bubble level is provided outside the phantom. To adjust the level of the phantom.
  • the large-aperture test phantom contains a 3 cm layer of pure water or an overflow layer. Used to test the signal-to-noise ratio and uniformity of magnetic resonance.
  • the test liquid is double distilled water, nickel chloride, sodium chloride or copper sulfate pentahydrate. It can also be replaced with other magnetic resonance standard test fluids.
  • the diameter of the first cylindrical structure and the second cylindrical structure is 35-45 cm, which can meet the needs of imaging detection in a wide range of the dedicated magnetic resonance radiotherapy simulation positioning system.
  • the diameter of the first cylindrical structure and the second cylindrical structure is 35-45 cm, which can meet the needs of imaging detection in a wide range of the dedicated magnetic resonance radiotherapy simulation positioning system.
  • the inner part of the first part is hollow, and the wedge-shaped blocks are arranged in a ring along the axis of the first cylindrical structure.
  • the wedge-shaped structure is a solid material, which is imaged in a magnetic resonance image and used to test the limit resolution of the magnetic resonance system.
  • the test solution fills the inside of the first part.
  • the third part is the solid structure.
  • the hole-shaped grooves are hollow and filled with test liquid, which is used to test the spatial resolution of the magnetic resonance system.
  • the hollow square cylinders in the second and fourth parts are used as the basic geometric distortion test unit to test the geometric distortion of the magnetic resonance system in the magnetic resonance image.
  • FIG. 1 is a schematic structural view of a phantom of the present invention
  • FIG. 2 is a schematic structural view of another perspective view of the phantom of the present invention.
  • FIG. 3 is a schematic view of the front view of the phantom of the present invention.
  • FIG. 4 is a schematic view of the rear view structure of the phantom of the present invention.
  • FIG. 5 is a schematic view of the side view structure of the phantom of the present invention.
  • FIG. 6 is a schematic diagram of three-dimensional geometric distortion measurement of the large-aperture test phantom of the present invention.
  • FIG. 7 is a three-dimensional geometric distortion measurement display diagram of the large-aperture test phantom of the present invention.
  • a magnetic resonance guided radiotherapy system imaging quality control phantom includes four parts, namely a first part 1, a second part 2, a third part 3, and a fourth part 4, which The four parts are all 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 Equal diameter, and its length ratio is 1:2.5-3.5; the diameter of the first cylindrical structure and the second cylindrical structure is 35-45cm, the length of the first cylindrical structure is 8-12cm, the length of the second cylindrical structure The length is 35-45cm to suit the magnetic field center length of magnetic resonance imaging.
  • the combined surface of the first part 1 and the third part 3 is parallel to the axis of the first cylindrical structure, and the first part 1 is larger than the third part 3, in a direction perpendicular to the combined surface of the first part 1 and the third part 3, the first part
  • the width ratio of 1 and the third part 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, the second part 2 is larger than the fourth part 4; in a direction perpendicular to the combined surface of the second part 2 and the fourth part 4,
  • the width ratio of the second part 2 and the fourth part 4 is 3:1.
  • 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 interior of the first part 1 is hollow, which includes several wedge-shaped blocks 8 .
  • the wedge-shaped blocks 8 are arranged circularly along the axis of the first cylindrical structure, and the tip of the wedge-shaped block 8 faces the axis;
  • the angle of the wedge-shaped block 8 is 2°, and the wedge-shaped block 8
  • the angle is 180°.
  • the angle of the ring structure enclosed by the wedge-shaped block 8 is limited to 180°, which is used to test the limit resolution.
  • the third part 3 is a solid structure, and a number of cylindrical grooves 7 with different diameters are provided inside, and the axis of the cylindrical groove 7 is parallel to the axis of the first cylindrical structure;
  • each of the second part 2 and the fourth part 4 is provided with a plurality of hollow square cylinders 6, the square cylinders 6 are arranged parallel to the axis of the second cylindrical structure, and several square cylinders are arranged A grid-like structure; the side length of the square cylinder 6 is 0.8-1.2cm, and the wall thickness is 0.08-0.12cm.
  • the number of square cylinders 6 is 90-120.
  • the outer walls and internal structures of the first part 1, the second part 2, the third part 3, and the fourth part 4 are made of materials that do not generate magnetic resonance signals, and these four parts are provided with water injection ports to inject the test liquid.
  • the diameter of the first cylindrical structure and the second cylindrical structure is 35-45 cm, which can meet the needs of imaging detection in a wide range of the dedicated magnetic resonance radiotherapy simulation positioning system.
  • the inner part of the first part is hollow, and the wedge-shaped blocks 8 are arranged in a ring along the axis of the first cylindrical structure.
  • the wedge-shaped structure is a solid material, which is imaged in a magnetic resonance image and used to test the limit resolution of the magnetic resonance system.
  • the test solution fills the inside of the first part.
  • the third part is the solid structure.
  • the hole-shaped grooves are hollow and filled with test liquid, which is used to test the spatial resolution of the magnetic resonance system.
  • the hollow square cylinders in the second and fourth parts are used as the basic geometric distortion test unit to test the geometric distortion of the magnetic resonance system in the magnetic resonance image.
  • the materials of the outer wall and internal structure of the first part 1, the second part 2, the third part 3, and the fourth part 4 are 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.
  • a hollow centerline column is provided at the center axis of the second cylindrical structure, and the material of the centerline column is the same as the material of the square column 6.
  • a bubble level is provided outside the phantom to adjust the level of the phantom.
  • the large-aperture test phantom contains a 3cm layer of pure water or overflow. Used to test the signal-to-noise ratio and uniformity of magnetic resonance.
  • the test liquid can be double distilled water, nickel chloride, sodium chloride or copper sulfate pentahydrate.
  • the upper half of the large-aperture test phantom can be used alone for a magnetic resonance guided radiotherapy system with a flat bed positioning bed.
  • the combination of the upper and lower parts can be used for the magnetic resonance system with an arc-shaped examination table.
  • the large-aperture test phantom is mainly filled with a magnetic resonance test solution.
  • the test fluid can be replaced through the bolt ports at both ends of the phantom.
  • a matrix grid image can be formed at specific positions on the cross section, sagittal plane and coronal plane (the grid forms a dark grid with no signal, and the bright signal of the surrounding test fluid), and a point cloud image (The grid forms dark spots with no signal, and bright signals around the test fluid).
  • the above-mentioned grid column structure is connected in the form of a tenon and mortise at the intersection of the grid. If a 3D printed grid is used, it can be printed in one piece without connecting.
  • the above grid structure has a thickened centerline columnar structure mark at the centerline position of the phantom cylinder, and when it is traversed, a thickened columnar grid or dot image will be formed on the scanned image. Used to identify the physical center of the phantom.
  • the large-aperture test phantom contains a 3cm pure water layer or an overflow layer for testing the signal-to-noise ratio and uniformity of magnetic resonance.
  • the large-aperture test phantom contains a triangular plexiglass or 3D printed material structure with a 45-degree diagonal slope.
  • the structure has three groups and is placed orthogonally. It is used to test the spatial positioning accuracy on the cross-section, sagittal plane, and coronal plane.
  • the large-aperture test phantom contains a 30-degree long slope of plexiglass or 3D printed material structure for testing the thickness and layer deviation of the magnetic resonance scan.
  • the large-aperture test phantom contains a star-shaped test structure, specifically a 2 degree wedge-shaped plexiglass or 3D printed material structure, placed in a circle, used to measure the modulation transfer function MTF and the limit resolution.
  • the large-aperture test phantom is equipped with a 3D digital lattice model, which is stored in the form of online software and random software. After opening through DICOM browser or image reading software, any level and any FOV can be selected.
  • the large-aperture test phantom image obtained by the user can be registered and fused by reading the field of view and matrix information in the DICOM file header and the corresponding FOV model of the digital lattice model with the actual image of the phantom.
  • Through two-color display or 3D space display visually display the geometric distortion caused by field deviation.
  • the large-aperture test phantom is equipped with 3D digital processing software, which can retrieve the DICOM sequence image of the phantom on the computer, and automatically recognize the phantom positioning block and the layer thickness and matrix in the DICOM image Information, automatically determine the quality control test layer image in the sequence image. Automatically identify the aforementioned grid or point cloud signals in the image of the quality control test layer, use projection to determine the center of mass or geometric center of the top angle or point of the grid, and determine the phantom/image center, FOV and distance from the center 22.5cm/ Image range of 17.5cm/10cm.
  • Digital processing software automatically calculates the difference between the point image and the real position at different distances from the phantom/image center, and uses different signals or colors to indicate the difference in three different directions.
  • the change in the field strength or geometric distortion of the FOV measured by the phantom is represented in a graph.
  • the 3D digital lattice model can calculate the brightness amplitude of the phantom water signal.
  • the corresponding FOV model of the digital lattice model is registered and fused with the actual image of the phantom, and the signal difference of each spatial position in the image is displayed in pseudo color contrast. Used to compare the signal amplitude and signal-to-noise ratio of multi-channel coils with spatial position.
  • the large-aperture test phantom test solution and various internal structures can be scanned and imaged under CT at the same time, and can also be applied to the quality control and quality assurance of CT-guided radiotherapy systems.

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Abstract

一种磁共振引导的放射治疗系统成像质量控制体模，第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。第一部分（1）的内部中空，楔形块（8）沿第一圆柱状结构的轴线环形排列，楔形结构为实体材料，在磁共振影像中成像，用于测试磁共振系统极限分辨率。测试液充满第一部分（1）内部。第三部分（3）为实体结构，内部设置有若干个直径不等的孔形槽，充盈测试液，用于测试磁共振系统的空间分辨率。第二部分（2）和第四部分（4）的中空方形柱体（6），用于在磁共振影像中测试磁共振系统的几何畸变。

Description

一种磁共振引导的放射治疗系统成像质量控制体模 技术领域
本发明属于磁共振放射治疗领域，尤其涉及一种磁共振引导的放射治疗系统成像质量控制体模。
背景技术
磁共振具有良好的软组织对比度，同时无X射线造成的电离辐射损伤。非常适合需要进行放射物理治疗的病人进行定位成像。随着多模态系统整合技术的提高，磁体和电子束设备、钴60设备的一体化逐渐实现。越来越多的一体式磁共振放射治疗模拟定位系统问世并投入临床应用，例如：ViewRay设备(0.35T磁场+钴60系统)、MRI-Linac设备(1.5T磁场6MV Linac系统)以及独立的定位用大孔径平板床磁共振系统等。
专用于放射治疗的磁共振放射治疗模拟定位系统与传统磁共振成像系统相比，具有放射治疗的适用性和兼容性。在检查床、磁体孔径、磁体长度等硬件配置，以及扫描序列、定位软件等软件配置上均具有独特设计，一些相关的特殊成像参数随之出现。且磁共振模拟定位系统成像将直接应用于放射治疗计划制定，其成像效果与放射剂量具有直接关系。
这种情况下，专用磁共振放疗模拟定位系统的质量控制和治疗保证测试工作，对于放射定位和剂量保证，具有极其重要的意义。目前，国内外已有完备完善的磁共振质量控制和质量保证检测体模，然而这些检测体模并不适用于专用磁共振放疗模拟定位系统的质量检测。例如：专用磁共振放疗模拟定位系统具有大孔径(大于60cm)的成像区域，对于直径20cm左右的普通质控体模，无法满足大范围内成像检测的需求。其次，专用磁共振放疗模拟定位系统的检查床为平板类型，并设有专门的支撑架放置各种扫描线圈，这要求检测体模能够对应不同的线圈类型进行针对性的测试。最重要的是，部分专用放疗模拟定位磁共振系统需要磁体有开口，便于直线加速器的电子束通过，这种特殊设计不能使用小尺寸的检测体模来测试。
发明内容
针对上述现有技术中存在的技术问题，本发明的目的是提供一种磁共振引导的放射治疗系统成像质量控制体模。该体模可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。
为了解决以上技术问题，本发明的技术方案为：
一种磁共振引导的放射治疗系统成像质量控制体模，包括四部分，分别为第一部分、第二部分、第三部分和第四部分，这四部分均为筒状结构，第一部分和第三部分组成第一 圆柱状结构，第二部分和第四部分组成第二圆柱状结构，第一圆柱状结构和第二圆柱状结构等径，且其长度比为1:2.5-3.5；第一圆柱状结构和第二圆柱状结构的直径为35-45cm；
第一部分和第三部分的组合面与第一圆柱状结构的轴线平行，且第一部分大于第三部分；第二部分和第四部分的组合面与第一圆柱状结构的轴线平行，第二部分大于第四部分；
第一部分和第三部分的组合面与第二部分和第四部分的组合面重合；
第一部分的内部中空，其内部包括若干个楔形块，若干个楔形块完全相同，楔形块沿第一圆柱状结构的轴线环形排列，且楔形块的尖端朝向轴线；
第三部分为实体结构，内部设置有若干个直径不等的柱形槽，柱形槽的轴线与第一圆柱状结构的轴线平行；
第二部分和第四部分内部均设置有若干个中空的方形柱体，方形柱体与第二圆柱状结构的轴线平行设置，且若干个方形柱体排列成网格状结构；
第一部分、第二部分、第三部分和第四部分的外壁及内部结构均由不会产生磁共振信号的材质制成，且这四部分均设置注水口，以注入测试液。
第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。
第一部分的内部中空，楔形块沿第一圆柱状结构的轴线环形排列，楔形结构为实体材料，在磁共振影像中成像，用于测试磁共振系统极限分辨率。测试液充满第一部分内部。
第三部分为实体结构，内部设置有若干个直径不等的孔形槽，孔形槽中空，充盈测试液，用于测试磁共振系统的空间分辨率。
第二部分和第四部分的中空方形柱体，柱体作为基本几何畸变测试单元，用于在磁共振影像中测试磁共振系统的几何畸变。
优选的，第一圆柱状结构的长度为8-12cm，第二圆柱状结构35-45cm。
长度适于磁共振成像的磁场中心长度。
优选的，沿垂直于第一部分和第三部分的组合面的方向，第一部分和第三部分的宽度比为3:1。
优选的，沿垂直于第二部分和第四部分的组合面的方向，第二部分和第四部分的宽度比为3:1。
优选的，所述楔形结构的角度为2°，楔形结构围成的环形结构的角度为180°。
楔形块围成的环形结构的角度限定为180°，用于测试极限分辨率。
用于测量调制传递函数MTF和极限分辨率。
优选的，第一部分、第二部分、第三部分和第四部分的外壁及内部结构的材质为有机 玻璃或3D打印材料。
优选的，所述方形柱体的边长为0.8-1.2cm，壁厚为0.08-0.12cm。
进一步优选的，所述方形柱体的数量为90-120个。
优选的，所述体模的顶板、底板和左右侧板上均设置有十字形线条标识。用于激光定位。
进一步优选的，所述十字形线条标识通过蚀刻或印刷于体模表面。
优选的，所述与第二圆柱状结构的中心轴线位置设置有中空的中心线柱，中心线柱的材质与方形柱体的材质相同。
优选的，所述体模的外部设置有气泡式水准仪。以调整体模的水平度。
优选的，大孔径测试体模内部包含3cm的纯水层或溢流层。用于测试磁共振的信噪比和均匀度。
优选的，测试液为双蒸水、氯化镍、氯化钠或五水硫酸铜。也可更换为其它磁共振标准测试液。
本发明的有益效果为：
第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。
第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。
第一部分的内部中空，楔形块沿第一圆柱状结构的轴线环形排列，楔形结构为实体材料，在磁共振影像中成像，用于测试磁共振系统极限分辨率。测试液充满第一部分内部。
第三部分为实体结构，内部设置有若干个直径不等的孔形槽，孔形槽中空，充盈测试液，用于测试磁共振系统的空间分辨率。
第二部分和第四部分的中空方形柱体，柱体作为基本几何畸变测试单元，用于在磁共振影像中测试磁共振系统的几何畸变。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。
图1为本发明的体模的立体图结构示意图；
图2为本发明的体模的另一角度的立体图结构示意图；
图3为本发明的体模的主视图结构示意图；
图4为本发明的体模的后视图结构示意图；
图5为本发明的体模的侧视图结构示意图；
图6为本发明的大孔径测试体模的三维几何畸变测量示意图；
图7为本发明的大孔径测试体模的三维几何畸变测量显示图。
其中，1、第一部分，2、第二部分，3、第三部分，4、第四部分，5、中心线柱，6、方形柱体，7、柱形槽，8、楔形块。
具体实施方式
应该指出，以下详细说明都是例示性的，旨在对本申请提供进一步的说明。除非另有指明，本文使用的所有技术和科学术语具有与本申请所属技术领域的普通技术人员通常理解的相同含义。
需要注意的是，这里所使用的术语仅是为了描述具体实施方式，而非意图限制根据本申请的示例性实施方式。如在这里所使用的，除非上下文另外明确指出，否则单数形式也意图包括复数形式，此外，还应当理解的是，当在本说明书中使用术语“包含”和/或“包括”时，其指明存在特征、步骤、操作、器件、组件和/或它们的组合。
如图1和图5所示，一种磁共振引导的放射治疗系统成像质量控制体模，包括四部分，分别为第一部分1、第二部分2、第三部分3和第四部分4，这四部分均为筒状结构，第一部分1和第三部分3组成第一圆柱状结构，第二部分2和第四部分4组成第二圆柱状结构，第一圆柱状结构和第二圆柱状结构等径，且其长度比为1:2.5-3.5；第一圆柱状结构和第二圆柱状结构的直径为35-45cm，第一圆柱状结构的长度为8-12cm，第二圆柱状结构的长度为35-45cm，以适应磁共振成像的磁场中心长度。
第一部分1和第三部分3的组合面与第一圆柱状结构的轴线平行，且第一部分1大于第三部分3，沿垂直于第一部分1和第三部分3的组合面的方向，第一部分1和第三部分3的宽度比为3:1。
第二部分2和第四部分4的组合面与第一圆柱状结构的轴线平行，第二部分2大于第四部分4；沿垂直于第二部分2和第四部分4的组合面的方向，第二部分2和第四部分4的宽度比为3:1。
如图2和图4所示，第一部分1和第三部分3的组合面与第二部分2和第四部分4的组合面重合；第一部分1的内部中空，其内部包括若干个楔形块8，若干个楔形块8完全相同，楔形块8沿第一圆柱状结构的轴线环形排列，且楔形块8的尖端朝向轴线；楔形块8的角度为2°，楔形块8围成的环形结构的角度为180°。楔形块8围成的环形结构的角度限定为180°，用于测试极限分辨率。
第三部分3为实体结构，内部设置有若干个直径不等的柱形槽7，柱形槽7的轴线与第 一圆柱状结构的轴线平行；
如图3所示，第二部分2和第四部分4内部均设置有若干个中空的方形柱体6，方形柱体6与第二圆柱状结构的轴线平行设置，且若干个方形柱体排列成网格状结构；方形柱体6的边长为0.8-1.2cm，壁厚为0.08-0.12cm。方形柱体6的数量为90-120个。
第一部分1、第二部分2、第三部分3和第四部分4的外壁及内部结构均由不会产生磁共振信号的材质制成，且这四部分均设置注水口，以注入测试液。
第一圆柱状结构和第二圆柱状结构的直径为35-45cm，可以满足专用磁共振放疗模拟定位系统的大范围内成像检测的需求。第一部分的内部中空，楔形块8沿第一圆柱状结构的轴线环形排列，楔形结构为实体材料，在磁共振影像中成像，用于测试磁共振系统极限分辨率。测试液充满第一部分内部。第三部分为实体结构，内部设置有若干个直径不等的孔形槽，孔形槽中空，充盈测试液，用于测试磁共振系统的空间分辨率。第二部分和第四部分的中空方形柱体，柱体作为基本几何畸变测试单元，用于在磁共振影像中测试磁共振系统的几何畸变。
第一部分1、第二部分2、第三部分3和第四部分4的外壁及内部结构的材质为有机玻璃或3D打印材料。
所述体模的顶板、底板和左右侧板上均设置有十字形线条标识，用于激光定位，十字形线条标识通过蚀刻或印刷于体模表面。
第二圆柱状结构的中心轴线位置设置有中空的中心线柱，中心线柱的材质与方形柱体6的材质相同。所述体模的外部设置有气泡式水准仪，以调整体模的水平度。
大孔径测试体模内部包含3cm的纯水层或溢流层。用于测试磁共振的信噪比和均匀度。
测试液可以为双蒸水、氯化镍、氯化钠或五水硫酸铜等测试液。
大孔径测试体模上半部分可单独用于具有平板检查定位床的磁共振引导放疗系统使用。上下部分组合后可用于具有弧形检查床的磁共振系统使用。
大孔径测试体模除内部实体结构外，主要灌注磁共振测试溶液。测试液可通过体模两端的螺栓口进行更换。
在体模的磁共振扫描图像上，可以在横断面、矢状面和冠状面的特定位置形成矩阵网格图像(网格形成无信号的暗格，周围测试液亮信号)、和点云图像(网格形成无信号的暗点，周围测试液亮信号)。
上述网格柱状结构在格栅交点处，以榫卯形式连接，如采用3D打印格栅，可以一体打印完成，不需连接。
上述网格结构在体模圆筒的中心线位置，有加粗的中心线柱状结构标识，横断为扫描 图像上会形成加粗的柱状网格或点状图像。用以标识体模物理中心。
大孔径测试体模内部包含3cm的纯水层或溢流层，用于测试磁共振的信噪比和均匀度。
大孔径测试体模内部包含45度对角斜坡的三角有机玻璃或3D打印材质结构，结构有三组，正交放置，用于在横断面、矢状面和冠状面进行空间定位准确性测试。
大孔径测试体模内部包含30度长斜坡的有机玻璃或3D打印材质结构，用于测试磁共振扫描层厚和层偏差。
大孔径测试体模内部含有星型测试结构，具体为2度的楔形有机玻璃或3D打印材质结构，圆周放置，用于测量调制传递函数MTF和极限分辨率。
大孔径测试体模配套3D数字点阵模型，以线上软件和随模软件形式存储。通过DICOM浏览器或读图软件打开后，可以实现任意层面、任意FOV的选取。用户扫描获得的大孔径测试体模图像，可以通过读取DICOM文件头中的视野和矩阵信息，将数字点阵模型的对应FOV模型同体模实际图像进行配准、融合，对比显示实际格栅和点阵位置与图像格栅和点阵位置的差异，定量分析对应位置的空间偏移量，并推导出场偏差。通过双色显示或3D空间显示，直观展示场偏差导致的几何畸变。
如图6和图7所示，大孔径测试体模配套3D数字处理软件，可在计算机上通过调取体模DICOM序列图像，通过自动识别体模定位块和DICOM图像中的层厚、矩阵等信息，自动确定序列图像中的质控测试层图像。对质控测试层图像中的前述格栅或点云信号进行自动识别，使用投影方式确定格栅顶角或点的质心或几何中心，同时确定体模/图像中心、FOV和距离中心22.5cm/17.5cm/10cm的图像范围。数字处理软件自动测算距离体模/图像中心不同距离的点像同真实位置的差异，并用不同信号或颜色表明在三个不同方向上的差异。以图表形式表示体模测量的FOV内场强变化或几何畸变。
3D数字点阵模型可以计算出体模水信号的亮度幅值，通过数字点阵模型的对应FOV模型同体模实际图像进行配准、融合，以伪彩色对比显示图像中各空间位置的信号差异，用以比较多通道线圈随空间位置而变化的信号幅值和信噪比。
大孔径测试体模测试液和内部各种结构可同时在CT下扫描成像，同样可应用于CT引导的放射治疗系统的质量控制和质量保证。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种磁共振引导的放射治疗系统成像质量控制体模，其特征在于：包括四部分，分别为第一部分、第二部分、第三部分和第四部分，这四部分均为筒状结构，第一部分和第三部分组成第一圆柱状结构，第二部分和第四部分组成第二圆柱状结构，第一圆柱状结构和第二圆柱状结构等径，且其长度比为1:2.5-3.5；第一圆柱状结构和第二圆柱状结构的直径为35-45cm；
    第一部分和第三部分的组合面与第一圆柱状结构的轴线平行，且第一部分大于第三部分；第二部分和第四部分的组合面与第一圆柱状结构的轴线平行，第二部分大于第四部分；
    第一部分和第三部分的组合面与第二部分和第四部分的组合面重合；
    第一部分的内部中空，其内部包括若干个楔形块，若干个楔形块完全相同，楔形块沿第一圆柱状结构的轴线环形排列，且楔形块的尖端朝向轴线；
    第三部分为实体结构，内部设置有若干个直径不等的柱形槽，柱形槽的轴线与第一圆柱状结构的轴线平行；
    第二部分和第四部分内部均设置有若干个中空的方形柱体，方形柱体与第二圆柱状结构的轴线平行设置，且若干个方形柱体排列成网格状结构；
    第一部分、第二部分、第三部分和第四部分的外壁及内部结构均由不会产生磁共振信号的材质制成，且这四部分均设置注水口，以注入测试液。
  2. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：第一圆柱状结构的长度为8-12cm，第二圆柱状结构35-45cm。
  3. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：沿垂直于第一部分和第三部分的组合面的方向，第一部分和第三部分的宽度比为3:1。
  4. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：沿垂直于第二部分和第四部分的组合面的方向，第二部分和第四部分的宽度比为3:1。
  5. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：所述楔形结构的角度为2°，楔形结构围成的环形结构的角度为180°。
  6. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：第一部分、第二部分、第三部分和第四部分的外壁及内部结构的材质为有机玻璃或3D打印材料。
  7. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：所述方形柱体的边长为0.8-1.2cm，壁厚为0.08-0.12cm，方形柱体的数量为90-120个。
  8. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：所述体模的顶板、底板和左右侧板上均设置有十字形线条标识，十字形线条标识通过蚀刻 或印刷于体模表面。
  9. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：所述与第二圆柱状结构的中心轴线位置设置有中空的中心线柱，中心线柱的材质与方形柱体的材质相同。
  10. 根据权利要求1所述的磁共振引导的放射治疗系统成像质量控制体模，其特征在于：所述体模的外部设置有气泡式水准仪。
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