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


Kuhn, Felix P; Spinner, Georg; Del Grande, Filippo; Wyss, Michael; Piccirelli, Marco; Erni, Stefan; Pfister, Pascal; Ho, Michael; Sah, Bert-Ram; Filli, Lukas; Ettlin, Dominik A; Gallo, Luigi M; Andreisek, Gustav; Manoliu, Andrei (2016). MR imaging of the temporomandibular joint: Comparison between acquisitions at 7.0 Tesla using dielectric pads and 3.0 Tesla. Dentomaxillofacial Radiology:20160280.

Abstract

OBJECTIVES To qualitatively and quantitatively compare MR imaging 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 IRB approved study with written informed consent. 12 asymptomatic volunteers were imaged at 7.0T and 3.0T using 32-channel head coils. High-permittivity dielectric pads consisting of barium titanate in deuterated suspension were used for imaging at 7.0T. Imaging protocol consisted of oblique sagittal PDw-TSE sequences. For quantitative analysis, pixel-wise signal-to-noise ratio (SNR) 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 7.0T using high-permittivity dielectric pads was feasible in all volunteers. Quantitative analysis showed similar SNR for both field strengths (mean±SD; 7.0T, 13.02±3.92; 3.0T, 14.02±3.41; two-sample t-tests, p = 0.188). At 7.0T, qualitative analysis yielded better visibility of all anatomical subregions of the temporomandibular disc (anterior band, intermediate zone, posterior band) compared to 3.0T (Wilcoxon signed-rank tests, p<0.05, corrected for multiple comparisons). CONCLUSIONS MR imaging of the TMJ at 7.0 T using high-permittivity dielectric pads yields superior visibility of the temporomandibular disc compared to 3.0T.

Abstract

OBJECTIVES To qualitatively and quantitatively compare MR imaging 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 IRB approved study with written informed consent. 12 asymptomatic volunteers were imaged at 7.0T and 3.0T using 32-channel head coils. High-permittivity dielectric pads consisting of barium titanate in deuterated suspension were used for imaging at 7.0T. Imaging protocol consisted of oblique sagittal PDw-TSE sequences. For quantitative analysis, pixel-wise signal-to-noise ratio (SNR) 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 7.0T using high-permittivity dielectric pads was feasible in all volunteers. Quantitative analysis showed similar SNR for both field strengths (mean±SD; 7.0T, 13.02±3.92; 3.0T, 14.02±3.41; two-sample t-tests, p = 0.188). At 7.0T, qualitative analysis yielded better visibility of all anatomical subregions of the temporomandibular disc (anterior band, intermediate zone, posterior band) compared to 3.0T (Wilcoxon signed-rank tests, p<0.05, corrected for multiple comparisons). CONCLUSIONS MR imaging of the TMJ at 7.0 T using high-permittivity dielectric pads yields superior visibility of the temporomandibular disc compared to 3.0T.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Diagnostic and Interventional Radiology
04 Faculty of Medicine > University Hospital Zurich > Clinic for Neuroradiology
04 Faculty of Medicine > Center for Dental Medicine > Clinic for Masticatory Disorders and Complete Dentures, Geriatric and Special Care Dentistry
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:5 October 2016
Deposited On:17 Nov 2016 09:24
Last Modified:07 Feb 2017 17:22
Publisher:British Institute of Radiology
ISSN:0250-832X
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1259/dmfr.20160280
PubMed ID:27704872

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