快速采集技术在颈部IDEAL序列中的应用比较

发布时间：2018-06-14 10:05

本文选题：阵列空间敏感性编码技术 + 颈部　；参考：《临床放射学杂志》2015年11期

【摘要】：目的探讨阵列空间敏感性编码技术(ASSET)技术对常规颈部三点法非对称回波水脂分离(IDEAL)序列图像质量影响。方法随机搜集40例颈部扫描患者,均采用常规扫描和ASSET采集技术扫描,为两种扫描方式对采集时间、图像质量、特殊吸收率(SAR)进行比较,分成A、B两组。A组为常规轴位T2WI IDEAL、T1WI FSE、冠状位T2WI IDEAL序列;B组为选用AEEST采集技术的轴位T2WI IDEAL、T1WI FSE、冠状位T2WI IDEAL序列。结果 A组序列总的扫描时间为10 min 36 s,B组序列总的扫描时间为6 min 13 s,B组扫描时间远远短于A组扫描时间;采用ASSET技术的IDEAL FSE-T2WI与未采用ASSET技术的IDEAL FSE-T2WI SNR比较,P0.05,具有显著统计学差异;CNR比较结果,P0.001,具有显著统计学差异;B组图像质量总得分值高于A组,P0.001,差异具有显著性;两组10 s SAR值结果比较无显著差异(P0.05),但B组10 s SAR平均值小于A组。结论加入AEEST采集技术的IDEAL序列利用多通道相控阵线圈的敏感范围,对MRI数据进行空间编码,与常规IDEAL序列在颈部扫描比较在不降低SNR、对比度的情况下,大大地缩短了扫描时间,并很好控制SAR在合理范围之内,在日常颈部IDEAL扫描时选择ASSET采集技术是可行的。
[Abstract]:Objective to investigate the effect of array spatial sensitivity coding technique (ASSET) on the image quality of conventional three-point method for asymmetric echo water lipid separation (IDEAL) sequence. Methods 40 cases of neck scanning were randomly collected and scanned by conventional scan and ASSET technique. The acquisition time, image quality and special absorptivity were compared between the two scanning methods. Group A was divided into two groups: group A: routine axial T2WI T2WI IDEALT1WI FSE, coronal T2WI T2WI IDEAL sequence group B: AEEST acquisition T2WI T1WI T1WI FSE, coronal T2WI T2WI IDEAL sequence. Results the total scanning time of group A was 10 min 36 s ~ (-1) B was 6 min 13 s ~ (-1) B was much shorter than that of group A. There was significant statistical difference between the image quality of group B and that of group A (P 0.001). There was significant difference in the SNR of real FSE-T2WI using ASSET and that of SNR without ASSET (P 0.001). The total score of image quality in group B was significantly higher than that in group A (P 0.001). There was no significant difference in 10 s SAR between the two groups, but the average value of 10 s SAR in group B was lower than that in group A. Conclusion using the sensitive range of multi-channel phased array coils, the idea sequence with AEEST acquisition technique can encode the MRI data in space. Compared with conventional idea sequence in neck scanning, the scan time is greatly shortened without reducing SNR and contrast. It is feasible to select the ASSET acquisition technology in the daily neck image scan, and to control SAR well within a reasonable range.
【作者单位】：武汉大学人民医院放射科;
【分类号】：R445.2

【参考文献】