Diagnostic and Interventional Radiology, Heidelberg University Hospital, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany.
Department of Gastroenterology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
BMC Med Imaging. 2021 Jan 11;21(1):10. doi: 10.1186/s12880-020-00532-w.
Despite synchronization to respiration, respiration-navigated (RN) 3D turbo-spin-echo MRCP is limited by susceptibility to motion artifacts. The aim of this study was to assess the quality of pancreaticobiliary duct visualization of a non-RN MRCP alternative based on balanced steady-state free precession imaging (BSSFP) with overlapping slices compared with RN-MRCP.
This is a retrospective study on 50 patients without pancreaticobiliary duct disease receiving MRCP at 1.5 T. We performed an intraindividual comparison of coronal RN-MRCP with combined coronal and transverse BSSFP-MRCP. Image quality was scored by 3 readers for 6 pancreaticobiliary duct segments (3 pancreatic, 3 biliary) using a 6-point scale. A segment score of 3 or lower as assessed by at least 2 of 3 readers was defined as insufficient segment visualization. Nonparametric tests and interrater reliability testing were used for statistical analysis.
Overall duct visualization averaged over all readers was scored with 4.5 ± 1.1 for RN-MRCP (pancreatic, 4.1 ± 0.5; biliary, 5.0 ± 0.4) and 4.9 ± 0.9 for combined coronal and transverse BSSFP-MRCP (pancreatic, 4.6 ± 0.6; biliary, 5.1 ± 0.6), respectively (p < 0.001). The number of segments visualized insufficiently was 81/300 for RN-MRCP and 43/300 for BSSFP-MRCP (p < 0.001). Segments visualized insufficiently only in RN-MRCP had a mean score of 4.4 ± 0.8 in BSSFP-MRCP. Overall interrater agreement on superiority of BSSFP-MRCP segment scores over corresponding RN-MRCP was 0.70. Mean acquisition time was 98% longer for RN-MRCP (198.0 ± 98.7 s) than for combined coronal and transverse BSSFP-MRCP (100.2 ± 0.4 s).
Non-RN BSSFP-MRCP with overlapping slices is a fast alternative to RN-MRCP, frequently providing sufficient duct visualization when RN-MRCP fails.
尽管与呼吸同步，呼吸导航（RN）3D 涡轮回波磁共振胰胆管成像（MRCP）受到运动伪影的影响。本研究旨在评估基于平衡稳态自由进动成像（BSSFP）的胰腺胆管显示质量，该方法采用重叠切片，与 RN-MRCP 相比。
这是一项回顾性研究，纳入 50 例无胰胆管疾病的患者，在 1.5T 进行 MRCP。我们对冠状面 RN-MRCP 与冠状面和横断面 BSSFP-MRCP 进行了个体内比较。3 位读者使用 6 分制对 6 个胰胆管段（3 个胰管段，3 个胆管段）进行图像质量评分。至少 3 位读者中有 2 位评分低于 3 分被定义为胰胆管段显示不足。采用非参数检验和组内相关系数评估进行统计学分析。
所有读者的平均胰胆管显示评分分别为 RN-MRCP 4.5±1.1（胰管段，4.1±0.5；胆管段，5.0±0.4）和联合冠状面和横断面 BSSFP-MRCP 4.9±0.9（胰管段，4.6±0.6；胆管段，5.1±0.6）（p<0.001）。RN-MRCP 显示不足的胰胆管段数为 81/300，BSSFP-MRCP 为 43/300（p<0.001）。仅在 RN-MRCP 中显示不足的胰胆管段，在 BSSFP-MRCP 中的评分平均为 4.4±0.8。BSSFP-MRCP 段评分优于相应 RN-MRCP 的总体组内相关系数为 0.70。RN-MRCP 的平均采集时间为 198.0±98.7s，比联合冠状面和横断面 BSSFP-MRCP（100.2±0.4s）长 98%。
重叠切片的非 RN BSSFP-MRCP 是 RN-MRCP 的快速替代方法，当 RN-MRCP 失败时，通常能提供足够的胰胆管显示。
