Examination of MR-CT(0.5 Tesla) imaging in the internal derangement of temporomandibular joint.

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In recent years many advances have developed in the field of temporomandibular joint (TMJ) imaging. The newest of these involves the use of magnetic resonance (MR)-CT imaging to evaluate internal derangement of the TMJ. MR-CT imaging can produce highquality tomographic images of greater soft-tissue contrast without ionizing radiation or known biological hazards.<BR>The normal TMJ was evaluated using MR-CT imaging on five volunteers (aged 20-25 years) and compared with ten patients (aged 17-65 years) who had been diagnosed internal derangement of the TMJ. MR-CT imaging was performed with the 0.5 T VISTA MR system (PICKER INTERNATIONAL) using the surface coil. We selected spin-echo sequences (TR 1, 000 msec, TE 40 msec; two averages, 256×256 matrix, scan time of 8 min 36 see). Oblique 5 mm thick images were obtained with open and closed jaw positions.<BR>Findings of MR-CT examinations were correlated with findings of conventional radiographic and clinical examinations. MR-CT provided information about meniscal position and morphology, especially in the open jaw position. MR-CT is a useful method for diagnosis of the internal derangement of the TMJ.
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