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Real-time MRI of the temporomandibular joint at 15 frames per second-A feasibility study.
Eur J Radiol. 2016 Dec; 85(12):2225-2230.EJ

Abstract

The purpose of this study was to develop and evaluate a novel method for real-time MRI of TMJ function at high temporal resolution and with two different contrasts. Real-time MRI was based on undersampled radial fast low angle shot (FLASH) acquisitions with iterative image reconstruction by regularized nonlinear inversion. Real-time MRI movies with T1 contrast were obtained with use of a radiofrequency-spoiled FLASH sequence, while movies with T2/T1 contrast employed a gradient-refocused FLASH version. TMJ function was characterized in 40 randomly selected volunteers by sequential 20s acquisitions of both the right and left joint during voluntary opening and closing of the mouth (in a medial, central and lateral oblique sagittal section perpendicular to the long axis of the condylar head). All studies were performed on a commercial MRI system at 3T using the standard head coil, while online reconstruction was achieved with a bypass computer fully integrated into the MRI system. As a first result, real-time MRI studies of the right and left TMJ were successfully performed in all 40 subjects (80 joints) within a total examination time per subject of only 15min. Secondly, at an in-plane resolution of 0.75mm and 5mm section thickness, the achieved temporal resolution was 66.7ms per image or 15 frames per second. Thirdly, both T1-weighted and T2/T1-weighted real-time MRI movies provided information about TMJ function such as disc position, condyle mobility and disc-condyle relationship. While T1 contrast offers a better delineation of structures during rapid jaw movements, T2/T1 contrast was rated superior for characterizing the articular disc. In conclusion, the proposed real-time MRI method may become a robust and efficient tool for the clinical assessment of TMJ function.

Authors+Show Affiliations

Department of Prosthodontics, University Medical Center, Göttingen, Germany.Department of Prosthodontics, University Medical Center, Göttingen, Germany.Department of Prosthodontics, University Medical Center, Göttingen, Germany.Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany.Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany. Electronic address: ajoseph@mpibpc.mpg.de.Department of Prosthodontics, University Medical Center, Göttingen, Germany.Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

27842671

Citation

Krohn, Sebastian, et al. "Real-time MRI of the Temporomandibular Joint at 15 Frames Per second-A Feasibility Study." European Journal of Radiology, vol. 85, no. 12, 2016, pp. 2225-2230.
Krohn S, Gersdorff N, Wassmann T, et al. Real-time MRI of the temporomandibular joint at 15 frames per second-A feasibility study. Eur J Radiol. 2016;85(12):2225-2230.
Krohn, S., Gersdorff, N., Wassmann, T., Merboldt, K. D., Joseph, A. A., Buergers, R., & Frahm, J. (2016). Real-time MRI of the temporomandibular joint at 15 frames per second-A feasibility study. European Journal of Radiology, 85(12), 2225-2230. https://doi.org/10.1016/j.ejrad.2016.10.020
Krohn S, et al. Real-time MRI of the Temporomandibular Joint at 15 Frames Per second-A Feasibility Study. Eur J Radiol. 2016;85(12):2225-2230. PubMed PMID: 27842671.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Real-time MRI of the temporomandibular joint at 15 frames per second-A feasibility study. AU - Krohn,Sebastian, AU - Gersdorff,Nikolaus, AU - Wassmann,Torsten, AU - Merboldt,Klaus-Dietmar, AU - Joseph,Arun A, AU - Buergers,Ralf, AU - Frahm,Jens, Y1 - 2016/10/19/ PY - 2016/04/12/received PY - 2016/09/05/revised PY - 2016/10/18/accepted PY - 2016/11/16/entrez PY - 2016/11/16/pubmed PY - 2016/12/20/medline KW - Articular disk KW - Condyle KW - MR imaging/diagnosis KW - Real-time imaging KW - Temporomandibular joint SP - 2225 EP - 2230 JF - European journal of radiology JO - Eur J Radiol VL - 85 IS - 12 N2 - The purpose of this study was to develop and evaluate a novel method for real-time MRI of TMJ function at high temporal resolution and with two different contrasts. Real-time MRI was based on undersampled radial fast low angle shot (FLASH) acquisitions with iterative image reconstruction by regularized nonlinear inversion. Real-time MRI movies with T1 contrast were obtained with use of a radiofrequency-spoiled FLASH sequence, while movies with T2/T1 contrast employed a gradient-refocused FLASH version. TMJ function was characterized in 40 randomly selected volunteers by sequential 20s acquisitions of both the right and left joint during voluntary opening and closing of the mouth (in a medial, central and lateral oblique sagittal section perpendicular to the long axis of the condylar head). All studies were performed on a commercial MRI system at 3T using the standard head coil, while online reconstruction was achieved with a bypass computer fully integrated into the MRI system. As a first result, real-time MRI studies of the right and left TMJ were successfully performed in all 40 subjects (80 joints) within a total examination time per subject of only 15min. Secondly, at an in-plane resolution of 0.75mm and 5mm section thickness, the achieved temporal resolution was 66.7ms per image or 15 frames per second. Thirdly, both T1-weighted and T2/T1-weighted real-time MRI movies provided information about TMJ function such as disc position, condyle mobility and disc-condyle relationship. While T1 contrast offers a better delineation of structures during rapid jaw movements, T2/T1 contrast was rated superior for characterizing the articular disc. In conclusion, the proposed real-time MRI method may become a robust and efficient tool for the clinical assessment of TMJ function. SN - 1872-7727 UR - https://www.unboundmedicine.com/medline/citation/27842671/Real_time_MRI_of_the_temporomandibular_joint_at_15_frames_per_second_A_feasibility_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0720-048X(16)30325-4 DB - PRIME DP - Unbound Medicine ER -