Guo Hongyu, Pei Xiaomin, Luo Weitao, Dai Jianpin
School of Electrical Engineering, Shenyang Univrsity of Technology, Shenyang 110023, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2011 Oct;28(5):922-6, 931.
Phased array coils (multiple receiver coil systems) have been extensively used for acquisition of MR images owing to their ability of increasing SNR, extending field-of-view (FOV), and reducing acquisition time. But the SOS algorithm,which is main method for phased array image reconstruction,will cause inhomogeneity in reconstructed image. A regularized least square method for phased array image combination is proposed in this paper. In the method, an additional reference scan is performed in advance. By using the reference scan, coil sensitivity map can be acquired, and image reconstructed from reference scan can be used as reference data in the regulation term. Experiments showed that the image uniformity was greatly improved by this method with scanning phantom and volunteer.
相控阵线圈（多接收线圈系统）因其能够提高信噪比、扩展视野（FOV）并减少采集时间，已被广泛用于磁共振成像的采集。但作为相控阵图像重建主要方法的SOS算法会导致重建图像出现不均匀性。本文提出一种用于相控阵图像合成的正则化最小二乘法。该方法预先进行一次额外的参考扫描。通过使用参考扫描，可以获取线圈灵敏度图，并且从参考扫描重建的图像可作为正则化项中的参考数据。实验表明，使用该方法对体模和志愿者进行扫描时，图像均匀性得到了极大改善。
