自制辅助匀场装置在1.5T MR甲状腺DWI中的应用  

Application of self-made auxiliary device for shimming on thyroid DWI with 1.5T MR

作　　者：惠庆桃[1] 李洁[1] 王周璇[1] 刘高元 罗小兰[1] 马春[1] 明兵[1] HUI Qingtao;LI Jie;WANG Zhouxuan;LIU Gaoyuan;LUO Xiaolan;MA Chun;MING Bing(Department of Radiology, People's Hospital of Deyang City, Deyang 618000, China)

机构地区：[1]德阳市人民医院放射科,四川德阳618000

出　　处：《中国医学影像技术》2019年第5期765-768,共4页Chinese Journal of Medical Imaging Technology

基　　金：四川省医学科研青年创新课题(Q14025)

摘　　要：目的探讨自制辅助匀场装置对改善1.5T MR甲状腺DWI图像质量的价值。方法采用灌装高浓度硅油的硅胶袋自制辅助匀场装置,以相同参数对42名健康志愿者进行2次甲状腺DWI扫描(b=0、400、800 s/mm^2),第2次扫描时使用自制辅助匀场装置。测量使用匀场装置前后DWI图像中甲状腺和背景图像的信号强度,计算SNR;并对图像质量进行评级。比较使用辅助匀场装置前后的DWI图像SNR及评级的差异。结果 42名志愿者全部完成检查,均无颈部不适或呼吸不畅等不适。在b=400、800 s/mm^2 DWI图像中,使用辅助匀场装置后图像质量明显提高,评级差异均有统计学意义(P均<0.001)。使用自制辅助匀场装置前DWI甲状腺SNR分别为3.62[95%CI(1.97, 8.10), b=400 s/mm^2]和4.41[95%CI(2.62, 8.69), b=800 s/mm^2],使用后为10.20[95%CI(4.05, 23.23), b=400 s/mm^2]和6.79[95%CI(3.24, 18.85), b=800 s/mm^2],差异均有统计学意义(P均<0.05)。结论使用自制辅助匀场装置可明显提高甲状腺DWI图像SNR和图像质量,且使用方便,受试者无不适,值得临床推广使用。Objective To investigate the value of self-made auxiliary device for shimming on thyroid DWI, in order to improve image quality. Methods Totally 42 healthy volunteers underwent identical DWI sequence scanning(b=0, 400, 800 s/mm^2) twice to obtain images of thyroid, while the auxiliary device-silicone bags filled with high concentratianon silicone oil was used for the second scanning. The signals of thyroid and background noise were measured, and SNR was calculated with and without the device, then image quality was graded. SNR and grading of DWI images before and after using the auxiliary shimming device were compared. Results All 42 volunteers completed the examination and without discomfort such as neck discomfort or poor breathing. For b=400, 800 s/mm^2 DWI images, the image quality was greatly improved after using the auxiliary shimming device, and the differences of grading were statistically significant(both P<0.001). SNR of DWI images with the auxiliary shimming device were 10.20(95% CI [4.05, 23.23], b=400 s/mm^2) and 6.79(95% CI [3.24, 18.85], b=800 s/mm^2), much higher than those of DWI images without the device(3.62, 95% CI [1.97, 8.10];4.41, 95% CI [2.66, 8.69]) respectively(both P<0.05). Conclusion Using the self-made auxiliary shimming device can significantly improve SNR and image quality of thyroid DWI images, which is easy to use without complaint and worthy of promotion in clinical practice.

关 键 词：甲状腺 扩散磁共振成像 辅助匀场装置 

分 类 号：R322[医药卫生—人体解剖和组织胚胎学] R445[医药卫生—基础医学]