Moriya Susumu, Miki Yukio, Yokobayashi Tsuneo, Kanagaki Mitsunori, Komori Yoshiaki, Ishikawa Mitsunori
Ishikawa Clinic, Kyoto, Japan.
Acta Radiol. 2010 Mar;51(2):175-8. doi: 10.3109/02841850903321633.
In magnetic resonance imaging (MRI) of the knee joint, when imaging the knee in a flexed position using the chemical-shift-selective (CHESS) method, lingering fat signals in the popliteal region are sometimes seen.
To investigate whether a pad filled with rice (rice pad) placed in the popliteal space is effective in eliminating the lingering fat signals in MR images of the flexed knee, based on the hypothesis that the use of a rice pad would improve the fat suppression effect.
Subjects were 10 healthy volunteers (five males, five females; age, 20-45 years) from whom images were taken using CHESS. Images were obtained with: 1) the knee extended and nothing placed underneath; 2) the knee bent with a sponge placed underneath; and 3) the knee bent with a rice pad placed underneath. The effectiveness of suppressing fat signals was visually assessed by one radiologist and one radiological technologist.
The fat suppression effect in images obtained with the knee extended was good. In contrast, the images made with a sponge under the knee had conspicuous lingering fat signals for nearly all subjects. In the images made with a rice pad under the knee, a uniformly good fat signal suppression effect was seen in all patients, and the assessment score was far higher than that with the sponge pillow (P<0.001).
Lingering fat signals were suppressed with the use of a rice pad, and fat-suppressed images of the knee joint using CHESS were found to be improved.
在膝关节的磁共振成像（MRI）中，当使用化学位移选择（CHESS）方法对屈曲位的膝关节进行成像时，有时会在腘窝区域看到残留的脂肪信号。
基于使用米垫会提高脂肪抑制效果这一假设，研究放置在腘窝间隙的米垫在消除屈曲膝关节的磁共振图像中残留脂肪信号方面是否有效。
研究对象为10名健康志愿者（5名男性，5名女性；年龄20 - 45岁），采用CHESS方法对其进行成像。成像条件如下：1）膝关节伸直且下方未放置任何物品；2）膝关节屈曲且下方放置海绵；3）膝关节屈曲且下方放置米垫。由一名放射科医生和一名放射技师对脂肪信号抑制效果进行视觉评估。
膝关节伸直时所获图像的脂肪抑制效果良好。相比之下，几乎所有受试者在膝关节下方放置海绵时所获图像均有明显的残留脂肪信号。在膝关节下方放置米垫时所获图像中，所有患者均呈现出均匀良好的脂肪信号抑制效果，且评估分数远高于使用海绵垫时（P < 0.001）。
使用米垫可抑制残留脂肪信号，且发现使用CHESS方法获得的膝关节脂肪抑制图像得到了改善。
