Pelvic imaging with phased‐array coils: Quantitative assessment of signal‐to‐noise ratio improvement

Cecil E. Hayes, Mark J. Dietz, Bernard F. King, Richard L. Ehman

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


The signal‐to‐noise ratios (S/Ns) of two different pelvic magnetic resonance (MR) imaging phased arrays were compared with that of the body coil. Each array consisted of two coils placed anteriorly and two posteriorly, oriented transversely in one array and longitudinally in the other. S/N measurements were obtained in an adjustable water‐filled phantom that simulated the shape and radio‐frequency loading effects of various‐size patients. Depending on the simulated anterior‐posterior thickness of the patient, the S/N produced by the longitudinal array ranged from 2.3 to 3.1 times higher than that of the body coil. The S/N of the transverse array was 3.1 to 3.4 times higher. The increased coil sensitivity permits imaging with shorter acquisition times, smaller fields of view, finer resolution, and/or thinner sections. Two examples in patients demonstrate the enhanced imaging capability of the phased arrays.

Original languageEnglish (US)
Pages (from-to)321-326
Number of pages6
JournalJournal of Magnetic Resonance Imaging
Issue number3
StatePublished - 1992


  • Coil arrays
  • Pelvic organs, MR
  • Pelvis, MR
  • Phantom
  • Technology

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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