3.0T 放射状 MRI を用いた肩腱板断裂範囲の評価法

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Hypothesis: Magnetic resonance imaging is useful for evaluating the rotator cuff, but some tendinous insertions cannot be assessed using conventional oblique coronal and axial imaging due to the presence of partial volume effect. The purpose of this study was to determine whether radial-sequence magnetic resonance imaging could visualize normal rotator cuff insertions and rotator cuff tears more clearly than standard imaging. Methods: Subjects comprised 20 patients with a normal rotator cuff and 20 patients with rotator cuff tears. Fat-suppressed T2-weighted imaging of rotator cuff insertions sliced into radial, oblique coronal and axial sections were obtained. The extent to which normal rotator cuff insertions were visualized in each of the three images, and the extent of rotator cuff tears in radial and oblique coronal images were then compared. Results: Radial images could visualize anterior portions of rotator cuff insertions from 0° to 22.9 ± 7.1° and from 45.0 ± 5.4° to 109.1 ± 9.6°, and posterior portion from 0° to 116.3 ± 8.3°. In comparison, oblique coronal images could visualize 0° to 20.3 ± 9.1° of anterior and 25.1 ± 5.6° of posterior portions, while axial images visualized 63.4 ± 7.5° to 109.1 ± 9.6° of anterior and 72.0 ± 9.5° to 105.0 ± 6.9° of posterior portions of rotator cuff insertions. Radial images also visualized a greater posterior area of rotator cuff tears than oblique coronal images. Conclusion: These findings demonstrate that radial-sequence magnetic resonance imaging is superior to oblique coronal and axial imaging, due to the ability to accurately visualize all rotator cuff insertions. Radial imaging is particularly good at visualizing clinically important posterior rotator cuff tears.
日本肩関節学会の論文

3.0T 放射状 MRI を用いた肩腱板断裂範囲の評価法

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