Accelerated motion corrected three-dimensional abdominal MRI using total variation regularized SENSE reconstruction.
Accelerated motion corrected three-dimensional abdominal MRI using total variation regularized SENSE reconstruction.
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DOI：
10.1002/mrm.25708
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发表时间：
2016-04
影响因子：
3.3
通讯作者：
Prieto C
中科院分区：
文献类型：
--
作者：
Cruz G;Atkinson D;Buerger C;Schaeffter T;Prieto C
开发一种非刚性运动校正重建，用于高度加速的自由呼吸三维 (3D) 腹部图像，无需外部传感器或额外扫描。所提出的方法通过欠采样加速采集，并使用采集的通用矩阵描述直接在重建中执行运动校正。使用自门控 3D 黄金径向相位编码轨迹获取数据，从而实现两阶段重建来估计并纠正相同数据的运动。在第一阶段，总变差正则化迭代 SENSE 用于重建高度欠采样的呼吸分辨率图像。对这些图像进行非刚性配准以估计腹部的复杂运动。在第二阶段，估计的运动场被纳入通用矩阵重建中，该重建使用全变分正则化并合并来自多个呼吸位置的 k 空间数据。该方法在九名健康志愿者身上进行了测试，并与两位专家使用肝脏清晰度、梯度熵、图像清晰度视觉评估和整体图像质量测量的标准门控重建进行了比较。该方法实现了与门控重建相似的质量，但肝脏清晰度（分别为 1.18 和 1.00）、梯度熵（1.00 和 1.00）、图像清晰度的视觉评分（2.22 和 2.44）以及图像质量的视觉等级（3.33 和 3.39）没有显着差异。使用所提出的方法可以将采集时间从 102 秒平均减少到 39 秒。体内结果证明了所提出的方法的可行性，显示与标准门控重建相似的图像质量，同时使用与显着减少的采集时间相对应的数据。 Magn Reson Med，2015。© 2015 作者。 《医学磁共振》由 Wiley periodicals, Inc. 代表国际医学磁共振学会出版。这是一篇根据知识共享署名许可条款的开放获取文章，允许在任何媒体上使用、分发和复制，前提是正确引用了原始作品。磁共振医学 75:1484–1498, 2016。© 2015 作者。 《医学中的磁共振》由 Wiley periodicals, Inc. 代表国际磁共振学会出版。
Develop a nonrigid motion corrected reconstruction for highly accelerated free‐breathing three‐dimensional (3D) abdominal images without external sensors or additional scans. The proposed method accelerates the acquisition by undersampling and performs motion correction directly in the reconstruction using a general matrix description of the acquisition. Data are acquired using a self‐gated 3D golden radial phase encoding trajectory, enabling a two stage reconstruction to estimate and then correct motion of the same data. In the first stage total variation regularized iterative SENSE is used to reconstruct highly undersampled respiratory resolved images. A nonrigid registration of these images is performed to estimate the complex motion in the abdomen. In the second stage, the estimated motion fields are incorporated in a general matrix reconstruction, which uses total variation regularization and incorporates k‐space data from multiple respiratory positions. The proposed approach was tested on nine healthy volunteers and compared against a standard gated reconstruction using measures of liver sharpness, gradient entropy, visual assessment of image sharpness and overall image quality by two experts. The proposed method achieves similar quality to the gated reconstruction with nonsignificant differences for liver sharpness (1.18 and 1.00, respectively), gradient entropy (1.00 and 1.00), visual score of image sharpness (2.22 and 2.44), and visual rank of image quality (3.33 and 3.39). An average reduction of the acquisition time from 102 s to 39 s could be achieved with the proposed method. In vivo results demonstrate the feasibility of the proposed method showing similar image quality to the standard gated reconstruction while using data corresponding to a significantly reduced acquisition time. Magn Reson Med, 2015. © 2015 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Magn Reson Med 75:1484–1498, 2016. © 2015 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance.