Performance of external and internal coil configurations for prostate investigations at 7 T

Greg Metzger, Pierre-Francois Van de Moortele, Can Akgun, Carl J. Snyder, Steen Moeller, John P Strupp, Peter M Andersen, Devashish Shrivastava, J. T Vaughan, Kamil Ugurbil, Gregor Adriany

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Three different coil configurations were evaluated through simulation and experimentally to determine safe operating limits and evaluate subject size-dependent performance for prostate imaging at 7 T. The coils included a transceiver endorectal coil (trERC), a 16-channel transceiver external surface array (trESA) and a trESA combined with a receive-only ERC (trESA+roERC). Although the transmit B1 (Ba1+) homogeneity was far superior for the trESA, the maximum achievable Ba1+ is subject size dependent and limited by transmit chain losses and amplifier performance. For the trERC, limitations in transmit homogeneity greatly compromised image quality and limited coverage of the prostate. Despite these challenges, the high peak Ba1+ close to the trERC and subject size-independent performance provides potential advantages especially for spectroscopic localization where high-bandwidth radiofrequency pulses are required. On the receive side, the combined trESA+roERC provided the highest signal-to-noise ratio and improved homogeneity over the trERC resulting in better visualization of the prostate and surrounding anatomy. In addition, the parallel imaging performance of the trESA+roERC holds strong promise for diffusion-weighted imaging and dynamic contrast-enhanced MRI.

Original languageEnglish (US)
Pages (from-to)1625-1639
Number of pages15
JournalMagnetic resonance in medicine
Volume64
Issue number6
DOIs
StatePublished - Dec 2010

Keywords

  • 7 Tesla
  • body imaging
  • endorectal coil
  • prostate
  • stripline array

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