An examination on magnetic resonance imaging of the temporomandibular joint.
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概要
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Recently, magnetic resonance (MR) imaging is capable of producting high-quality diagnosic images of medical fields. It is known that MR imaging provides much greater softtissue contrast than conventional X-ray based methods.<BR>With temporomandibular joint (TMJ) disorders, most X-ray based methods are useful for diagnosis of bony abnormalities, but their reduced soft-tissue contrast often make diagnostic evaluation difficult.<BR>This paper, reports on MR images of the TMJ. Materials and Methods: The subjects were 8 healthy persons (20-to 40-year males and/or females) with normal occlusion. No disorders were found in the TMJ and radiological findings were normal. MR imaging was performed on a 0.5 Tesla imaging system (MAGNETON, Siemens Co. made in Germany) using a surface coil (10 cm in diamter) for signal detection. Sagittal images in open (degrees of open: 1, 2, 3, 4cm) and closed mouth positions' were obtained of each subject.<BR>Results: The anatomy of the TMJ was well delineated on the MR images. Especially, important soft-tissue anatomy, including the articular disk with its anterior and posterior band, adjacent tissue, and its changes, etc., were readily appreciated: Namely low in signal (black) at the center of the articular disk, enhanced signal (dark gray) in its anterior and posterior edges and relatively hyperintense (bright) in the retrodiscal pad.<BR>We believe, therefore, that the region of the TMJ can now take advantage of the highresolution MR imaging, and these images permit the diagnostic evaluation of TMJ abnormalities.
- 社団法人 日本口腔外科学会の論文
著者
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船本 長一朗
金沢医科大学口腔外科学教室
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吉田 徹
金沢医科大学歯科口腔外科学教室
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高沢 一良
金沢医科大学歯科口腔外科学教室
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塩田 覚
金沢医科大学医学部歯科口腔外科学教室
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竹田 慶子
金沢医科大学歯科口腔外科学教室
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