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Comparison of a 32-channel head coil and a 2-channel surface coil for MR imaging of the temporomandibular joint at 3.0  T


Manoliu, Andrei; Spinner, Georg; Wyss, Michael; Filli, Lukas; Erni, Stefan; Ettlin, Dominik A; Ulbrich, Erika J; Kuhn, Felix P; Gallo, Luigi M; Andreisek, Gustav (2016). Comparison of a 32-channel head coil and a 2-channel surface coil for MR imaging of the temporomandibular joint at 3.0 T. Dentomaxillofacial Radiology, 45(4):20150420.

Abstract

PURPOSE To quantitatively and qualitatively compare MR imaging of the temporomandibular joint (TMJ) using a standard TMJ surface coil and a head coil at 3.0 Tesla (T). MATERIALS AND METHODS Twenty-two asymptomatic volunteers were MR-imaged using a 2-channel surface coil (standard TMJ coil) and a 32-channel head coil at 3.0 T (Philips Ingenia, Philips Healthcare, The Netherlands). Imaging protocol consisted of an oblique sagittal PDw-TSE sequence (TR/TE, 2700/26 ms). For quantitative assessment, a spherical phantom was imaged using the same sequence including a noise scan and a B1+ scan. Signal-to-noise-ratio-(SNR)-maps and B1+ maps were calculated on a voxel-wise basis. For qualitative evaluation, all volunteers underwent MR imaging of both TMJs with the jaw in closed position. Two independent blinded readers assessed accuracy of TMJ anatomical representation and overall image quality on a 5-point-scale. Quantitative and qualitative measurements were compared between coils using t-tests and wilcoxon-rank test, respectively. RESULTS Quantitative analysis showed similar B1+ and significantly higher SNR for the head coil compared to the TMJ surface coil. Qualitative analysis showed significantly better visibility and delineation of clinically relevant anatomical structures of the TMJ, including the articular disc, bilaminar zone and lateral pterygoid muscle. Furthermore, better overall image quality was observed for the head coil compared to the TMJ surface coil. CONCLUSION A 32-channel head coil is preferable to a standard 2-channel TMJ surface coil when imaging the TMJ at 3.0T, because it yields higher SNR, thus increasing accuracy of the anatomical representation of the TMJ.

Abstract

PURPOSE To quantitatively and qualitatively compare MR imaging of the temporomandibular joint (TMJ) using a standard TMJ surface coil and a head coil at 3.0 Tesla (T). MATERIALS AND METHODS Twenty-two asymptomatic volunteers were MR-imaged using a 2-channel surface coil (standard TMJ coil) and a 32-channel head coil at 3.0 T (Philips Ingenia, Philips Healthcare, The Netherlands). Imaging protocol consisted of an oblique sagittal PDw-TSE sequence (TR/TE, 2700/26 ms). For quantitative assessment, a spherical phantom was imaged using the same sequence including a noise scan and a B1+ scan. Signal-to-noise-ratio-(SNR)-maps and B1+ maps were calculated on a voxel-wise basis. For qualitative evaluation, all volunteers underwent MR imaging of both TMJs with the jaw in closed position. Two independent blinded readers assessed accuracy of TMJ anatomical representation and overall image quality on a 5-point-scale. Quantitative and qualitative measurements were compared between coils using t-tests and wilcoxon-rank test, respectively. RESULTS Quantitative analysis showed similar B1+ and significantly higher SNR for the head coil compared to the TMJ surface coil. Qualitative analysis showed significantly better visibility and delineation of clinically relevant anatomical structures of the TMJ, including the articular disc, bilaminar zone and lateral pterygoid muscle. Furthermore, better overall image quality was observed for the head coil compared to the TMJ surface coil. CONCLUSION A 32-channel head coil is preferable to a standard 2-channel TMJ surface coil when imaging the TMJ at 3.0T, because it yields higher SNR, thus increasing accuracy of the anatomical representation of the TMJ.

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Additional indexing

Item Type:Journal Article, refereed, further contribution
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Diagnostic and Interventional Radiology
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:3 February 2016
Deposited On:09 Feb 2016 14:53
Last Modified:30 Jan 2017 08:01
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.20150420
PubMed ID:26837671

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