Yong Pang1, Zhentian Xie2, Bing Wu1, Chunsheng Wang1, Daniel Vigneron1,3, Sarah Nelson1, Xiaoliang Zhang1
1Radiology&Biomedical Imaging, University of California, San Francisco, San Francisco, CA, USA; 2GE Healthcare, Waukesha, WI, USA; 3UCSF/UC Berkeley Joint Group Program in Bioengineering, San Francisco & Berkeley, CA, USA
In this work, a PC controlled 8-transmit channel circuit for 7T MR scanner is designed. Both the phase and the amplitude of each channel can be adjusted independently by PC via a 16-channel Digital Analog Converter (DAC) with custom-written software. The phase adjustment range is from -30 to 380, while the range of RF power attenuation is 26dB. RF power transistor and MOSFET are then applied to amplify the RF pulse of each channel up to 100W which can be used for driving transmit arrays. This design can be utilized to perform B1 shimming or parallel transmission.