MR imaging of the temporomandibular joint: Comparison between acquisitions at 7.0 T using dielectric pads and 3.0 T

Felix P. Kuhn, Georg Spinner, Filippo Del Grande, Michael Wyss, Marco Piccirelli, Stefan Erni, Pascal Pfister, Michael Ho, Bert Ram Sah, Lukas Filli, Dominik A. Ettlin, Luigi M. Gallo, Gustav Andreisek, Andrei Manoliu

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To qualitatively and quantitatively compare MRI of the temporomandibular joint (TMJ) at 7.0 T using high-permittivity dielectric pads and 3.0 T using a clinical high-resolution protocol. Methods: Institutional review board-approved study with written informed consent. 12 asymptomatic volunteers were imaged at 7.0 and 3.0 T using 32-channel head coils. High-permittivity dielectric pads consisting of barium titanate in deuterated suspension were used for imaging at 7.0 T. Imaging protocol consisted of oblique sagittal proton density weighted turbo spin echo sequences. For quantitative analysis, pixelwise signal-to-noise ratio maps of the TMJ were calculated. For qualitative analysis, images were evaluated by two independent readers using 5-point Likert scales. Quantitative and qualitative results were compared using t-tests and Wilcoxon signed-rank tests, respectively. Results: TMJ imaging at 7.0 T using high-permittivity dielectric pads was feasible in all volunteers. Quantitative analysis showed similar signal-to-noise ratio for both field strengths (mean ± SD; 7.0 T, 13.02 ± 3.92; 3.0 T, 14.02 ± 3.41; two-sample t-tests, p = 0.188). At 7.0 T, qualitative analysis yielded better visibility of all anatomical subregions of the temporomandibular disc (anterior band, intermediate zone and posterior band) than 3.0 T (Wilcoxon signed-rank tests, p < 0.05, corrected for multiple comparisons). Conclusions: MRI of the TMJ at 7.0 T using high-permittivity dielectric pads yields superior visibility of the temporomandibular disc compared with 3.0 T.

Original languageEnglish (US)
Article number20160280
JournalDentomaxillofacial Radiology
Volume46
Issue number1
DOIs
StatePublished - 2016
Externally publishedYes

Keywords

  • Magnetic fields
  • Magnetic resonance imaging
  • Signal-to-noise ratio
  • Temporomandibular joint
  • Temporomandibular joint disc

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)

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