Department of Radiology, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
Department of Radiology, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
Clin Imaging. 2022 Feb;82:216-223. doi: 10.1016/j.clinimag.2021.11.031. Epub 2021 Dec 4.
To find the best simultaneous multislice (SMS) accelerated setting for clinical application in knee MRI.
Thirty-three patients (mean age, 54 years; 21 women) who underwent knee MRI (conventional/SMS sequences) between June and October 2020 were enrolled. Two radiologists retrospectively evaluated sagittal T1- and T2-weighted conventional (2-fold parallel acquisition technique [PAT-2]) and SMS (SMS-2 [PAT-2 with 2-fold SMS], SMS-3, and SMS-4) images. For qualitative analysis, artifacts (zebra/residual aliasing) and diagnostic confidence for internal derangement of knee (bone marrow, cartilage, meniscus, anterior cruciate ligament, and synovium abnormalities) were evaluated. For quantitative analysis, contrast-to-noise ratios of bone marrow, meniscus, joint effusion, and ligament were evaluated.
Compared to PAT-2 (2 min 32 s), mean acquisition time was reduced by 47% in SMS-2; 64%, SMS-3; and 70%, SMS-4. In qualitative analysis, zebra artifacts were only seen on T2-weighted SMS images. The more SMS was applied, the more zebra and residual aliasing artifacts were seen and the lower diagnostic confidence was for internal derangement. However, qualitative analysis showed acceptable image quality in SMS-2 and SMS-3 images, but not in SMS-4 images. In quantitative analysis, SMS-4 images showed the lowest contrast-to-noise ratios and there were no significant differences among PAT-2, SMS-2, and SMS-3 images.
Applying SMS-3 to knee MRI reduced scan time and showed acceptable image quality compared to conventional (PAT-2). However, when evaluating SMS images, radiologists should know that when more SMS is applied, more zebra and residual aliasing artifacts appear.
寻找膝关节 MRI 临床应用中最佳的同步多层（SMS）加速设置。
本研究纳入了 2020 年 6 月至 10 月间进行膝关节 MRI（常规/SMS 序列）的 33 名患者（平均年龄 54 岁，21 名女性）。两名放射科医生回顾性评估了矢状面 T1 和 T2 加权常规（2 倍平行采集技术 [PAT-2]）和 SMS（SMS-2 [PAT-2 与 2 倍 SMS]、SMS-3 和 SMS-4）图像。定性分析包括评估伪影（斑马/残余混叠）和膝关节内部紊乱（骨髓、软骨、半月板、前交叉韧带和滑膜异常）的诊断信心。定量分析评估了骨髓、半月板、关节积液和韧带的对比噪声比。
与 PAT-2（2 分 32 秒）相比，SMS-2 的采集时间平均减少了 47%；SMS-3 减少了 64%；SMS-4 减少了 70%。在定性分析中，仅在 T2 加权 SMS 图像上可见斑马伪影。应用的 SMS 越多，斑马和残余混叠伪影越多，内部紊乱的诊断信心越低。然而，定性分析显示 SMS-2 和 SMS-3 图像具有可接受的图像质量，但 SMS-4 图像则不然。定量分析显示，SMS-4 图像的对比噪声比最低，而 PAT-2、SMS-2 和 SMS-3 图像之间没有显著差异。
与常规（PAT-2）相比，膝关节 MRI 应用 SMS-3 可减少扫描时间并保持可接受的图像质量。然而，在评估 SMS 图像时，放射科医生应注意到，应用的 SMS 越多，出现的斑马和残余混叠伪影就越多。
