完全3D打印技术制作MRI质量控制体模

目的 设计并完全通过3D打印技术制造测量精度高、制作速度快的MRI质量控制（以下简称质控）体模。方法 设计符合MRI质量控制标准的体模整体和测试组件。采用设计制图软件Pro/Engineer，通过工程制图，设计出MRI质控体模的各模块和外壳的3D模型；导出STL格式文件，并采用3D光敏成型打印机（LITE600HD）整体打印并组装。采用1.5T MR成像系统对体模进行测试。结果 星形测试模块测得相位编码方向极限分辨率为6.55 LP/cm，频率编码方向为4.19 LP/cm。几何畸变测试模块测量图像畸变率为9.94%。层厚测试模块实际计算层厚为5.63~6.51 mm，偏差为+1.51 mm，图像纵横比为0.984。结论 通过3D打印制造MRI质量控制体模测试精度高，成本低，加工速度快，能够满足MRI日常质控和定制化体模的需要。

Production of MRI quality control phantom completely using 3D printing

Objective To design and manufacture MRI quality control phantom with high measurement accuracy and fast production speed using 3D printing technique. Methods The phantom and test components meeting MRI quality control standards were designed. Using a computer 3D design drawing software Pro/Engineer, 3D model of each module and shell of the MRI quality control phantom was designed and exported as STL format file data. After being printed using a 3D photosensitive forming printer (LITE600HD) and assembled as a whole, the phantom was tested using a 1.5T MR imaging system. Results The limit resolution of the phase encoding direction and frequency encoding direction of this phantom measured with the star test module was 6.55 LP/cm and 4.19 LP/cm, respectively. The image distortion rate of this phantom measured with geometric distortion test module was 9.94%. The slice thickness test module actually calculated that the slice thickness was 5.63 to 6.51 mm with a deviation of +1.51 mm, and the image aspect ratio was 0.984. Conclusion MRI quality control phantom made by 3D printing has high precision, low cost and fast processing speed, which can meet the needs of MRI quality control and customization.