Alterations of the Temporomandibular Joint on Magnetic Resonance Imaging according to Growth and Development in Schoolchildren
Figure 4
Differences in the MRI signal within the articular eminences and mandibular condyles. (a) Morphology of the articular eminences and glenoid fossa of TMJ on MRI is in conformity with the outline of the mandibular condyles on fast spin-echo intermediate-weighted images of a healthy 10-year-old boy at the first examination. MRI signal of the articular eminence was yellow marrow, but that of mandibular condyle was red. The imaging parameters used in the MR sequences included 1050 ms TR, 15 ms effective echo time, flip angle of 90°, a 15 × 15 cm field of view, a matrix of 160 × 288 pixels, 17 mm slab thickness, and 3 mm section thickness. (b) Morphology of the articular eminences and glenoid fossa of TMJ on MRI is in conformity with the outline of the mandibular condyles on the second examination three years after the first examination in the same subject as Figure 4(a). MRI signal of the articular eminence was of yellow marrow, and that of the mandibular condyle was also yellow marrow. The imaging parameters used in the MR sequences included 1050 ms TR, 15 ms effective echo time, flip angle of 90°, a 15 × 15 cm field of view, a matrix of 160 × 288 pixels, 17 mm slab thickness, and 3 mm section thickness.
