Deng Jie, Larson Andrew C
Department of Radiology, Northwestern University, Chicago, Illinois 60611, USA.
Magn Reson Med. 2009 Jun;61(6):1269-78. doi: 10.1002/mrm.21989.
Quantitative abdominal T(2) measurements may be useful for lesion differentiation and functional tissue characterization. However, T(2) mapping of the abdomen with conventional spin-echo (SE) and turbo-spin-echo (TSE) approaches can be challenging due to physiologic motion artifacts. Multishot TSE-based PROPELLER (Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction) can provide superior image quality due to reduced sensitivity to motion artifacts. With echo-reordering to accurately estimate effective echo times and an extended slice thickness ratio to reduce stimulated echo effects, a modified PROPELLER approach may permit accurate, robust abdominal T(2) measurements. We validated the accuracy of our modified PROPELLER T(2)-mapping approach by comparison to conventional SE measurements in a phantom model and demonstrated the feasibility of acquiring accurate, high-quality abdominal T(2) maps in normal volunteers.
定量腹部T(2)测量对于病变鉴别和功能性组织特征描述可能有用。然而，由于生理运动伪影，采用传统自旋回波（SE）和快速自旋回波（TSE）方法进行腹部T(2)成像可能具有挑战性。基于多次激发TSE的螺旋桨（Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction，周期性旋转重叠平行线并增强重建）技术由于对运动伪影的敏感性降低，可提供更高的图像质量。通过回波重排序以准确估计有效回波时间，并采用扩展切片厚度比以减少受激回波效应，一种改良的螺旋桨方法可能允许进行准确、稳健的腹部T(2)测量。我们通过在体模模型中与传统SE测量进行比较，验证了改良螺旋桨T(2)成像方法的准确性，并证明了在正常志愿者中获取准确、高质量腹部T(2)图谱的可行性。
