Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
Department of Radiology, Yonsei Biomedical Research Institute, Research Institute of Radiological Science, Seoul, Korea.
J Magn Reson Imaging. 2017 Nov;46(5):1289-1297. doi: 10.1002/jmri.25672. Epub 2017 Mar 11.
To assess the feasibility of 3D navigator-triggered magnetic resonance cholangiopancreatography (MRCP) with combined parallel imaging (PI) and compressed sensing (CS).
With Institutional Review Board approval, 30 consecutive patients who underwent MRCP for suspected pancreaticobiliary disease were prospectively recruited. All patients underwent 3D navigator-triggered MRCP with conventional PI alone, and with combined PI and CS using a 3T machine. The acquisition time and relative duct-to-periductal contrast ratios (RCs) at three biliary segments were quantitatively compared between the two MRCP methods. Qualitative image parameters were independently evaluated by two blinded radiologists, and were compared between two methods using the Wilcoxon signed-rank test.
The mean acquisition time of MRCP with combined PI and CS (131.87 ± 33.60 sec) was significantly shorter compared with that of MRCP with PI (253.63 ± 56.08 sec; P < 0.001). The RC obtained using MRCP with combined PI and CS at two segments was slightly lower compared to that obtained using MRCP with PI (P = 0.007 and 0.002). Both reviewers found no significant differences in duct visualization, overall image quality, and degree of artifacts between the two methods (P ≥ 0.063; P = 0.637; and P = 0.752, respectively). Lesion conspicuity and confidence in duct abnormalities were comparable between two MRCP methods in both readers (P = 0.564 and P > 0.999).
Combined PI and CS reconstruction is feasible for 3D navigator-triggered MRCP, providing image quality comparable to that of MRCP with PI alone, in about half the acquisition time.
2 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2017;46:1289-1297.
评估 3D 导航触发磁共振胰胆管成像（MRCP）联合并行成像（PI）和压缩感知（CS）的可行性。
经机构审查委员会批准，前瞻性招募了 30 例疑似胰胆管疾病的患者进行 MRCP 检查。所有患者均在 3T 机上接受了 3D 导航触发 MRCP 检查，分别采用单独 PI 和 PI 联合 CS 两种方法。对两种 MRCP 方法的采集时间和三个胆管段的胆管周围对比率（RC）进行定量比较。两位盲法放射科医生对图像质量参数进行独立评估，并采用 Wilcoxon 符号秩检验比较两种方法。
联合 PI 和 CS 的 MRCP 平均采集时间（131.87±33.60 秒）明显短于 PI 的 MRCP（253.63±56.08 秒；P＜0.001）。联合 PI 和 CS 的 MRCP 在两个胆管段的 RC 稍低于 PI 的 MRCP（P＝0.007 和 0.002）。两位观察者均认为两种方法的胆管显示、整体图像质量和伪影程度无显著差异（P≥0.063；P＝0.637；P＝0.752）。两位观察者均认为两种 MRCP 方法的病变显示和对胆管异常的诊断信心相当（P＝0.564 和 P＞0.999）。
3D 导航触发 MRCP 联合 PI 和 CS 重建是可行的，可在大约一半的采集时间内提供与单独 PI 成像质量相当的图像。
2 技术功效：阶段 1 J. Magn. Reson. Imaging 2017；46：1289-1297.
