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Abstract #2724

16-Channel Tx Array and 32-Channel Rx Array for Brain MRI at 7T

Wei Zhao1, Boris Keil1, Jonnathan R. Polimeni1, James N. Blau1, Azma Mareyam1, Thomas Witzel1, Elfar Adalsteinsson2, Lawrence L. Wald1, 3

1A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, United States; 2Electrical Engineering and Computer Science, MIT, Cambridge, MA, United States; 3Division of Health Sciences and Technology, Harvard-MIT, Cambridge, MA, United States

Ultra-high field MRI can potentially improve diagnostic power using a coil setup consisting of a pTx array and a separate multi-channel Rx array. 32-channel receive arrays have been widely used in 7T brain MRI for improving sensitivity and parallel imaging performance. The use of simultaneous reception with multiple coils to speed-up encoding, has proven to be a requirement for obtaining high spatial resolution fMRI at 7T. Therefore, for improving the image quality of the pTx system, we combined a 16-channel transmit array and a 32-channel receive array with the ability for highly accelerated encoding and to perform parallel transmit excitations.