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Journal Article

Real-time MRI of the temporomandibular joint at 15 frames per second: A feasibility study.

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Merboldt,  K. D.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Joseph,  A. A.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Frahm,  J.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Citation

Krohn, S., Gersdorff, N., Wassmann, T., Merboldt, K. D., Joseph, A. A., Buergers, R., et al. (2016). Real-time MRI of the temporomandibular joint at 15 frames per second: A feasibility study. European Journal of Radiology, 85(12), 2225-2230. doi:10.1016/j.ejrad.2016.10.020.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-AEB6-D
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 20 s 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 3 T 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 15 min. Secondly, at an in-plane resolution of 0.75 mm and 5 mm section thickness, the achieved temporal resolution was 66.7 ms 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.