Department of Medical Imaging, Radboud University Medical Center, Geert Grooteplein Zuid 10, Nijmegen, The Netherlands; Department of Surgery, Radboud University Medical Center, Geert Grooteplein Zuid 10, Nijmegen, The Netherlands.
Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, The Netherlands.
Acad Radiol. 2022 Dec;29(12):1802-1807. doi: 10.1016/j.acra.2022.02.005. Epub 2022 Mar 4.
To assess the acquisition time and image quality of simultaneous multislice-accelerated diffusion-weighted imaging (SMS-DWI) versus conventional DWI (C-DWI) of the rectum.
In patients scheduled for a magnetic resonance imaging of the rectum, both SMS-DWI and C-DWI were performed on a 3T whole body magnetic resonance scanner. Image quality of the DWI sequences was reviewed by two independent radiologists who were blinded to the method of imaging using a five-point Likert scale: (score ranging from 1 (non-diagnostic) to 5 (excellent). The mean scores of SMS-DWI versus C-DWI were compared for the individual readers using a nonparametric test (Wilcoxon signed ranks).
The SMS-DWI protocol acquisition time was 4:08 min vs. 7:24 min per patient, which led to a reduction of 44.1% for the C-DWI protocol, both excluding time for sequence specific adjustments (shimming). No statistical differences between the conventional-, and SMS- diffusion weighted images were seen for both readers. Mean overall image quality of the SMS-DWI TRACE images was 3.5 (SD: 1.3) and 3.3 (SD: 1.0) for reader 1 and reader 2, respectively. Mean overall image quality of the C-DWI TRACE images was 3.4 (SD: 1.3) and 3.2 (SD: 1.1) for reader 1 and reader 2, respectively.
Optimized SMS-DWI compared to C-DWI in imaging of the rectum showed similar image quality while a significant acquisition time reduction was achieved.
评估同时多层加速扩散加权成像 (SMS-DWI) 与直肠常规 DWI (C-DWI) 的采集时间和图像质量。
在计划进行直肠磁共振成像的患者中，在 3T 全身磁共振扫描仪上同时进行 SMS-DWI 和 C-DWI。两位独立的放射科医生使用五点李克特量表对 DWI 序列的图像质量进行了回顾：（评分范围为 1（无法诊断）至 5（优秀）。使用非参数检验（Wilcoxon 符号秩检验）比较每位读者的 SMS-DWI 与 C-DWI 的平均评分。
SMS-DWI 方案的采集时间为 4:08 分钟/患者，而 C-DWI 方案为 7:24 分钟/患者，C-DWI 方案的采集时间减少了 44.1%，两者均不包括序列特定调整（匀场）的时间。两位读者均未发现常规和 SMS 扩散加权图像之间存在统计学差异。SMS-DWI TRACE 图像的总体平均图像质量为 3.5（SD：1.3）和 3.3（SD：1.0），读者 1 和读者 2 分别为 3.4（SD：1.3）和 3.2（SD：1.1）。
与 C-DWI 相比，直肠成像的优化 SMS-DWI 显示出相似的图像质量，同时采集时间显著缩短。
