Kai Wang1, Samantha J Ma2, Xingfeng Shao1, and Danny JJ Wang1
1University of Southern California, Los Angeles, CA, United States, 2Siemens Medical Solutions USA, Inc, Los Angeles, CA, United States
1University of Southern California, Los Angeles, CA, United States, 2Siemens Medical Solutions USA, Inc, Los Angeles, CA, United States
The Maxmin transmit B1 shimming implemented with parallel transmission for the labeling of the pseudo-continuous Arterial Spin Labeling sequence is a promising approach to increase the labeling efficiency.
Figure 3 (A) The location of the labeling plane (red dashed line) shown on the Maximum Intensity Projection in the coronal view of the Time-of-Flight sequence. (B) The ROI was manually drawn on the Time-of-Flight image to cover the four inflow arteries (left and right Vertebral Arteries and left and right Internal Carotid Arteries). The simulated combined B1+ field of the (C) Bcg shimming and the (D) Maxmin shimming. The minimum B1+ amplitude within ROI was increased by 58% for Maxmin shimming. A dark band formed (yellow arrow), which would not affect the labeling efficiency.
Figure 4 Perfusion map acquired by pCASL sequences with labeling of Bcg shimming and Maxmin shimming. Increased perfusion was observed for Maxmin shimming. The top and bottom slices were discarded since they were cropped during preprocessing of motion correction.
