Hayashida Yoshiko, Hirai Toshinori, Hiai Yasuhiro, Kitajima Mika, Imuta Masanori, Murakami Ryuji, Nakayama Yoshiharu, Awai Kazuo, Yamashita Yasuyuki, Takahashi Tetsuhiko, Hamada Kiyomi
Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan.
J Magn Reson Imaging. 2007 Sep;26(3):525-8. doi: 10.1002/jmri.21027.
To evaluate whether positional MR images of the lumbar spine, obtained with a horizontally open-configuration MR unit, demonstrate positional changes of the dural sac, and to assess whether there are significant differences in positional changes between healthy volunteers and patients with chronic low back pain.
The study population consisted of 15 patients with chronic low back pain and 14 healthy volunteers. MR images were obtained using a horizontally open-configuration 0.4-T MR unit. After conventional lumbar MR examinations, images were obtained in the flexion, neutral, and extension positions, using a positioning device. The anteroposterior diameter of the dural sac at the level of each lumbar disk was measured in the three positions and quantitative data were compared.
Our MR protocol was tolerated by all patients. In both patients and volunteers, the mean anteroposterior diameter of the dural sac was smaller in the extension positions than in the flexion positions. In the mean rate of change (RC) in the dural sac diameter at the site of the degenerated disks, the difference between the volunteers and patients was significant (P < 0.05). There was no significant difference in the mean RC between patients and volunteers without degenerative disks.
Using a horizontally open-configuration MR unit, positional MR imaging provided position-dependent change of the dural sac. Positional changes at the site of the degenerated disks may be different in patients with and without chronic low back pain.
评估使用水平开放式磁共振（MR）设备获得的腰椎定位MR图像是否能显示硬脊膜囊的位置变化，并评估健康志愿者和慢性下腰痛患者在位置变化上是否存在显著差异。
研究对象包括15例慢性下腰痛患者和14名健康志愿者。使用水平开放式0.4-T MR设备获取MR图像。在常规腰椎MR检查后，使用定位装置在屈曲、中立和伸展位获取图像。在三个位置测量每个腰椎间盘水平硬脊膜囊的前后径，并比较定量数据。
所有患者均耐受我们的MR检查方案。在患者和志愿者中，硬脊膜囊的平均前后径在伸展位均小于屈曲位。在退变椎间盘部位硬脊膜囊直径的平均变化率（RC）方面，志愿者和患者之间存在显著差异（P < 0.05）。在无退变椎间盘的患者和志愿者之间，平均RC无显著差异。
使用水平开放式MR设备，定位MR成像可显示硬脊膜囊随位置的变化。有或无慢性下腰痛的患者在退变椎间盘部位的位置变化可能不同。
