摘要
目的：分析比较3.0T磁共振不同DWI序列在正常胰腺中的伪影及信噪比（SNR）。方法：在3.0T磁共振上，30例正常志愿者行常规T1WI、频率饱和脂肪抑制T2WI，MRCP，DWI及LAVE平扫，DWI序列均基于SE-EPI序列及b值为0和600 s/mm2，包括X、Y、Z三轴弥散梯度憋气DWI（BH600ALL）、Z轴弥散梯度憋气DWI（BH600SI）、呼吸门控DWI（TRIG600）、呼吸门控翻转恢复脂肪抑制DWI（TRIG600+BS）、自由呼吸翻转恢复脂肪抑制DWI（FB600+BS）及憋气翻转恢复脂肪抑制DWI（BH600ALL+BS），统计学比较分析不同DWI序列正常胰腺伪影评分值及SNR。结果：正常胰腺在TRIG600+BS序列伪影评分最低，胰腺轮廓清晰，呈均匀低信号，FB600+BS胰腺轮廓模糊，TRIG600胰腺多呈不均匀高信号，憋气背景抑制DWI伪影评分最高，单因素方差分析统计学有明显差异，P＜0.001。正常胰腺在BH600ALL，BH600SI，TRIG600，TRIG600+BS，FB600+BS和BH600+BS六个DWI序列上的SNR有明显统计学差异，P＜0.001，其中TRIG600序列的SNR最高，BH600+BS序列最低；在不同DWI序列中，胰头、胰体及胰尾的SNR逐渐增加，胰头与胰尾的SNR有统计学差异，P＜0.05。结论：在3.0T MR仪上，TRIG600+BS中胰腺呈均匀一致低信号，轮廓清晰，图像质量优于其它五个DWI序列。
Abstract
Objective: To investigate the artifact and SNR of normal pancreas among different DWI sequences on 3.0T MR scanner. Methods: Thirty normal volunteers underwent conventional T1WI, T2WI with Fatsat., MRCP, DWI and non-enhanced LAVA on 3.0T. Based on SE-EPI sequence and b values=0 and 600 s/mm2, DWI sequences included breath-hold DWI with MPG pulses in X, Y, Z direction(BH600ALL), breath-hold DWI with MPG pulses in Z direction(BH600SI), respiratory-triggered DWI with MPG pulses in X, Y, Z direction(TRIG600), respiratory-triggered DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation(TRIG600+BS), free-breathing DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation(FB600+BS) and breath-hold DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation(BH600+BS). Artifacts and SNR of normal pancreas were statistically investigated and compared among different DWI sequences. Results: Artifacts of normal pancreas showed noticeably statistical difference among different DWI sequences by ANOVA(P＜0.001). Normal pancreas displayed the lowest artifact scores in TRIG600+BS and the highest artifact scores in BH600+BS. SNR of normal pancreas showed noticeably statistical difference among different DWI sequences(P＜0.001); Among six different DWI sequences, TRIG600 had the highest SNR, while BH600+BS had the lowest SNR. The head, body and tail of pancreas had the increasing SNR in all six different DWI sequences and the statistical difference in SNR was noticed between the head and tail of pancreas(P＜0.05). Conclusion: Normal pancreas in TRIG600+BS displayed homogeneous hypointensity, edge sharpness and the superior image quality compared to other five DWI sequences on 3.0T MR.
关键词
胰腺 /
磁共振成像 /
弥散
Key words
Pancreas /
Diffusion magnetic resonance imaging
姚秀忠;冯 豪;陈文芳;饶圣祥;孙 非;王 鹤;曾蒙苏.
3.0T磁共振不同DWI序列在正常胰腺中的分析评价[J]. 中国临床医学影像杂志. 2013, 24(1): 17-22
YAO Xiu-zhong;FENG Hao;CHEN Wen-fang;RAO Sheng-xiang;SUN Fei;WANG He;ZENG Meng-su.
Evaluation of diffusion-weighted MR imaging sequences of normal pancreas at 3.0T[J]. Journal of China Clinic Medical Imaging. 2013, 24(1): 17-22
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