Huabin Zhu1,2, Yanxia Li2, Bida Zhang3, Jianmin Wang1, Yan Zhuo2, Rong Xue2
1Radio Frequency Department, Siemens Mindit Magnetic Resonance Ltd., Shenzhen, Guangdong, China; 2State Key Lab. of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; 3Siemens Mindit Magnetic Resonance, Siemens Healthcare MR Collaboration NE Asia, Shenzhen, Guangdong, China
A large portion of fMRI experiments include visual stimulation. An unblocked vision window can improve subject's coziness, and hence improve the reliability of visual stimulation experiment. Normally fMRI experiments demand high stability of MRI scanners including coil and other components, to ensure stable signal magnitude for temporal measurements. Using Siemens Trio Tim system and its 12-ch head coil, the signal fluctuation with a signal shot EPI sequence without stimulation can be about 0.4-0.5 percent on water phantom. In this project, we developed an 8-ch TxRx phase-array head coil , which has two obvious advantages in fMRI. First, a rectangular window of size 116mmx74mm is opened in the upper part of the coil to provide a comfortable vision view for subjects. Second, there is significant improvement in signal stability, which helps to detect the small signal change during fMRI scanning.