Performance evaluation of 2-channel endorectal coil geometries for imaging the prostate at 7T

In prostate MRI at 7T, use of endorectal coils (ERCs) can improve the signal-to-noise ratio (SNR) more than 4-fold compared to using an external surface array (ESA). Here, we compare the SNR and transmit performance (B1+) of three different 2-channel ERC coil geometries (two loops, ERC-2OL; stripline-large loop, ERC-SLL; stripline-small loop, ERC-SSL) inside a uniform torso-sized phantom. ERC-SSL performed the best among the ERCs. SNR and B1+ of ERC-SSL compared to a 16-channel ESA has improved ~5.6-fold and ~6.9-fold, respectively. Reusable, rigid, multi-channel ERCs are a valuable tool in imaging the prostate at 7T.

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