肘部尺神经扩散张量成像技术参数优化的研究  

A study on optimizing technical parameters for diffusion tensor imaging of elbow ulnar nerve

作　　者：王林[1] 徐俊峰[1] 龚沈初[1] 姜洪标[1] 何书[1] 

机构地区：[1]南通市第一人民医院影像科,江苏 南通,226001

出　　处：《实用放射学杂志》2016年第8期1293-1296,共4页Journal of Practical Radiology

摘　　要：目的：优化肘部尺神经扩散张量成像（DTI）参数。方法使用5组不同 b 值和扩散梯度方向数量（NDGDs）DTI 序列采集13名志愿者肘部尺神经图像并建立扩散示踪图（DTT）。比较不同成像参数条件下,尺神经各向异性分数（FA）、表观扩散系数（ADC）、神经纤维束长度和 DTI 图像质量的差异性。结果18个正常尺神经 DTI 结果纳入研究。不同成像条件下,尺神经 FA 值无明显差异。当 NDGDs 一定时,b 值升高,图像质量下降,尺神经 ADC 值减低；而 NDGDs 对 ADC 值和图像质量无显著影响。b=1000 s/mm2,NDGDs=20时,测得尺神经纤维束长度最长,且 DTT 的主观评分最高。结论以 b=1000 s/mm2,NDGDs=20用于肘部尺神经 DTI,可获得良好的图像质量和稳定的观测指标。Objective To optimize the parameters for the diffusion tensor imaging （DTI）of the ulnar nerve in elbow.Methods 5 groups of DTI sequences with different b values and numbers of diffusion gradient directions （NDGDs）were used to collect ulnar nerve images from 13 volunteers,and then the diffusion tensor tractography （DTT）was established.The fractional anisotropy （FA）,apparent diffusion coefficient （ADC）,length of ulnar nerve fiber and DTI image quality were compared under different imaging parameters. Results DTI results for 18 normal ulnar nerves were included in the study.Under different imaging conditions,FAs showed no significant differences.With constant NDGDs,increasing b value decreased both image quality and ADCs of the ulnar nerve.NDGDs had no significant effects on ADCs or image quality.When b=1 000 s/mm2 and NDGDs=20,the length of the ulnar nerve fiber was the longest and DTT had the best subjective scoring in image quality.Conclusion b=1 000 s/mm2 and NDGDs=20 is recommended for DTI of elbow ulnar nerve,so as to obtain high image quality and stable observing targets.

关 键 词：扩散张量成像 扩散示踪图 扩散梯度方向数量 尺神经 

分 类 号：R445.2[医药卫生—影像医学与核医学] R338[医药卫生—诊断学]