Abstract
In attempt to assess the potential application of magnetic resonance for diagnostic imaging modality of the temporomandibular joint (TMJ), magnetic resonance imaging (MRI) of the joint was compared with the conventional radiographic images, plain tomography or computed tomography, and the actual structural features of TMJ in human cadaver were examined in relation to MR images. In addition, the effects of the cadaver treatment with formaldehyde on MRI were investigated expereimentally using the muscle and bone of the rats.
Findings obtained were as follows;
1. Magnetic resonance provided definite images of both osseous and soft-tissue components, i.e. muscle, fat and blood-vessel, without radiation exposure. The meniscus of TMJ could be also optimally visualized on MRI.
2. At present, however, it could not obtained precisely the detailed information of the meniscus on MRI, due to less sensitivity for detecting the pathological changes within the meniscus.
3. Magnetic resonance needed to put a restraint on a patient for long time to generate images and so its availability was limited in respect to patient tolerance.
4. MR images of the rat were markedly influenced by the treatment with formaldehyde and then it was desirable to obtain the precise phantom for the compensation.
5. Together with the development of technology, the improvement of image definition and the reduction of exposure time of MRI might be expected. Subsequently the excellent imaging modality as an aid to diagnostic procedure of TMJ might be developed for the future. On the other hand, it was suggested that the standardized system of MRI shoule be established.
