Behr, M., Held, P., Handel, G., Fellner, C.
Magnet resonance imaging (MRI) of the temporomandibular joint (TMJ) has now been established as a procedere of choice in the elevation of TMJ-disorders. One potential criticism of the TMJ MR imaging is the lack of any significant ability to assess joint function dynamically. With the advent of computer driven cine displays (CINE mode), dynamic information is available. In this investigation 21 patients with TMJ-disorders were examined by conventionel static MR imaging and by CINE mode. To facilitate CINE mode a device was developed to passively open the patients mouth from resting (closed) to fully open in user-defined increments (2 mm). In 18 cases (86 %) of the patients diagnosis took place with the static MR imaging, but in 3 cases (14%) the diagnosis took place only by dynamic information by CINE mode. The problem of CINE mode is that the image quality is reduced by reducing the examination time per slice. Because of technical limitations of the pulse-sequences data base the routine static image had a better resolution, contrast and artifact reduction than the images from dynamic sequences. These results show, that information of the cine display potentially complets the routine static images and may prove extremly valuable in the assessment of TMJ-dysfunction.