Malko J A, Hutton W C, Giacometti A R, Kater G, Greenfield P, Boden S D, Silcox D H
Department of Radiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
J Spinal Disord. 1996 Apr;9(2):129-35.
We tested the hypothesis that the visual interpretation of magnetic resonance imaging (MRI) scans of the asymptomatic lumbar spine are affected by diurnal changes in fluid exchange in the intervertebral discs. Ten male subjects carried a 20-kg backpack in the intervening 3-h period between two MRI scans of the lumbar spine. After the subjects arrived at the MRI center (within 45 min of awakening), they lay on a bed for 45 min. The first set of MRI scans were obtained. Each subject was then fitted with a 20-kg backpack. After they walked for 3 h, the pack was removed, and a second set of MRI scans were obtained immediately. The sets of MRI scans were reviewed by three radiologists: none of the three radiologists found differences in the interpretation of the MRI scans. On the basis of these results, diurnal changes in fluid exchange in the asymptomatic intervertebral disc (exaggerated in our case by the backpack) are undetectable by visual reading of MRI scans.
无症状腰椎磁共振成像（MRI）扫描的视觉解读会受到椎间盘内液体交换的昼夜变化影响。10名男性受试者在两次腰椎MRI扫描的中间3小时内背着一个20千克的背包。受试者到达MRI中心后（醒来后45分钟内），他们躺在床上45分钟，然后进行第一组MRI扫描。接着，给每位受试者背上一个20千克的背包。他们行走3小时后，取下背包，立即进行第二组MRI扫描。这两组MRI扫描图像由三位放射科医生进行评估：三位放射科医生均未发现MRI扫描解读上的差异。基于这些结果，通过MRI扫描的视觉判读无法检测到无症状椎间盘内液体交换的昼夜变化（在我们的案例中因背包负重而被放大）。
