Nishida Y, Aoki Y, Hayashi O, Murata T, Nishida E, Kani K
Department of Ophthalmology, Shiga University of Medical Science, Otsu, Japan.
Jpn J Ophthalmol. 1996;40(3):439-46.
The horizontal extraocular muscle volume of 11 normal adults and 3 ophthalmoplegic patients was measured with magnetic resonance imaging (MRI), using a 1.5 Tesla superconductive system which can provide T1 weighted images of 3 mm gapless slices of the orbit with the spin echo technique. The MRI film was projected and magnified on Kent paper with an overhead projector; muscle shapes were traced and cut from the paper. Muscle volume was defined as the total weight of the Kent paper shapes representing the muscles from all MRI slices. The average volumes of the medial and lateral rectus muscles (MRM, LRM) of the 11 subjects were 690 +/- 87 mm3 and 734 +/- 77 mm3. In two patients with peripheral nerve palsy, the small muscle volume was classified as atrophic; in the one patient with orbital myositis, the large muscle volume was classified as hypertrophic. This measurement technique is useful for evaluation of the extraocular muscles, especially in ophthalmoplegia.
使用1.5特斯拉超导系统，通过自旋回波技术，对11名正常成年人和3名眼肌麻痹患者的水平眼外肌体积进行了磁共振成像（MRI）测量，该系统能够提供眼眶3毫米无间隙切片的T1加权图像。将MRI胶片用投影仪投射并放大在肯特纸上；描绘出肌肉形状并从纸上剪下。肌肉体积定义为代表所有MRI切片中肌肉的肯特纸形状的总重量。11名受试者的内直肌和外直肌（MRM、LRM）平均体积分别为690±87立方毫米和734±77立方毫米。在两名周围神经麻痹患者中，小肌肉体积被归类为萎缩；在一名眼眶肌炎患者中，大肌肉体积被归类为肥大。这种测量技术有助于评估眼外肌，尤其是在眼肌麻痹的情况下。
