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Overall Activity of All Masticatory Muscles during Lateral Excursion

¹ Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan; and
² Division of Nuclear Medicine, Cyclotron and Radioisotope Center, Tohoku University, 2-1 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan

View larger version (61K): [in a new window]   Figure 1. Regions-of-interest over each masticatory muscle. Registered MR (left) and PET (right) images at the same slice level in the same subject. Black-white and color scales depict the MR signal intensity and the accumulation of FDG, respectively. Regions-of-interest are color-coded as follows: pink and yellow = right and left masseter muscles, purple and blue = right and left temporal muscles, green and orange = right and left medial pterygoid muscles, white and red = right and left lateral pterygoid muscles.

View larger version (24K): [in a new window]   Figure 2. The mean and standard deviation of the standardized uptake ratios in masticatory muscles for 11 subjects. (A) Comparison of the standardized uptake ratio among all masticatory muscles. Statistical significance was tested by a one-factor analysis of variance and the Games/Howell method (*p < 0.05). (B) Comparison of the standardized uptake ratio between the contralateral and ipsilateral muscles. Statistical significance was examined with Student’s t test (*p < 0.05). R = Right (Contralateral side); L = Left (Ipsilateral side); SUR = Standardized uptake ratio.

View larger version (102K): [in a new window]   Figure 3. PET-MRI fusion images of the head and neck, induced by left lateral excursion. Left upper and lower images are frontal and sagittal images in one subject (subject C: see Table). Red lines (A-F) show the levels of transverse scans shown in the center and right images. TM = temporal muscles, LP = lateral pterygoid muscles, MP = medial pterygoid muscles, MM = masseter muscles, SLG = sublingual glands.