Magnetic Resonance Imaging Of The Temporomandibular Joint Region Of The Normal Population

Objective To select rational scanning layer, scanning sequence and scanning parameter by scanning the normal temporomandibular joint (TMJ) with MRI and get the best imaging method of TMJ. To discuss and analyze quantitatively the relative anatomy of the TMJ and the position relation between the articular disc and the condyle by measuring the MRI image of the TMJ.Methods The MR machine of GE Signa Excite 3.0 T was used to scan the normal TMJ of 52 subjects and the best scanning layer, scanning sequence and scanning parameter was determined according to the image formation time and the image quality; The relative parameter of the anatomy tissue in the TMJ area on the scanning image was measured and the range of the relative parameter by statistical analysis was obtained; The relative parameter of the limpid articular disc images of 38 subjects was measured and the range of the range of the relative parameter by statistical analysis was obtained.Results From the images we can see that the scanning sequence is fast echo-wave sequence, the first scanning layer is oblique anteroposterior axes scanning and the selected image is proton density weighting image. The thickness range of the articular disk, the location information of the anterior zone and posterior zone in the sagittal plane image are got from the measuring result for the anatomy structure of the TMJ. The thickness of the anterior zone, intermediate zone and posterior zone are respectively 1.79 ± 0.27 mm, 0.82 ± 0.19 mm and 2.95 ± 0.69 mm. The location of the posterior zone is in ±5 ° between the front and back of the condyle cross crest; The location of the anterior zone is in 28 ° ± 6 ° in the included angel between articular tubercle and auditory canal anodic. The condyle width of the interior and exterior diameter is 20.88 ± 1.74 mm, the condyle width of the anteroposterior diameter is 9.29 ±1.10 mm and the included angle of the double sides' condyle macroaxis is 142.15 ° ± 4.55 ° with the measuring result in transverse axis layer. The double TMJ symmetry has not made evident difference after the statistical analysis. The TMJ area...