Tomomitsu Tatsushi, Murase Kenya, Sone Teruki, Fukunaga Masao
Department of Nuclear Medicine, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
Eur J Radiol. 2005 Oct;56(1):102-6. doi: 10.1016/j.ejrad.2004.12.005. Epub 2005 Jan 19.
In this study, we investigated the usefulness of T1-weighted sagittal MR images at the lumbar vertebrae in the vertebral morphometry, in comparison with lateral radiographs.
The subjects were 42 men (mean age: 53.0 years) and 41 women (mean age: 57.9 years). Both MRI and radiography of the lumbar spine were performed within 1 month. The vertebral body heights and their ratios were measured by the semi-automatic measuring system. The frequency of a vertebral fracture and the absolute value of vertebral body height in both morphometry were compared.
Based on the criteria for prevalent vertebral fracture using vertebral height ratios, the vertebrae were classified into four groups. Group 1 was defined as the vertebrae without fracture (n=347 vertebrae). Groups 2-4 were defined as the vertebrae with fracture; Group 2 by both MRI and X-ray morphometry (n=17), Group 3 by MRI morphometry alone (n=17), and Group 4 by X-ray morphometry alone (n=4). The rate of prevalent vertebral fracture diagnosed by MRI morphometry (8.8%) was higher than that by X-ray morphometry (5.5%). In Group 1, the values of anterior and posterior vertebral height obtained by MRI morphometry were greater than those obtained by X-ray morphometry. On the other hand, the values of central vertebral height obtained by MRI morphometry were smaller than those obtained by X-ray morphometry.
Severe biconcave deformity of vertebra can be detected by both MRI and X-ray morphometry, although mild biconcave deformity can be detected only by MRI morphometry.
在本研究中，我们调查了腰椎T1加权矢状面磁共振成像（MR图像）在椎体形态测量方面的实用性，并与腰椎侧位X线片进行比较。
研究对象为42名男性（平均年龄：53.0岁）和41名女性（平均年龄：57.9岁）。腰椎的MRI检查和X线检查均在1个月内完成。椎体高度及其比值通过半自动测量系统进行测量。比较两种形态测量方法中椎体骨折的发生率和椎体高度的绝对值。
根据椎体高度比值对椎体骨折的诊断标准，将椎体分为四组。第1组定义为无骨折的椎体（n = 347个椎体）。第2 - 4组定义为有骨折的椎体；第2组通过MRI和X线形态测量均诊断为骨折（n = 17），第3组仅通过MRI形态测量诊断为骨折（n = 17），第4组仅通过X线形态测量诊断为骨折（n = 4）。MRI形态测量诊断的椎体骨折发生率（8.8%）高于X线形态测量（5.5%）。在第1组中，MRI形态测量获得的椎体前、后高度值大于X线形态测量获得的值。另一方面，MRI形态测量获得的椎体中心高度值小于X线形态测量获得的值。
MRI和X线形态测量均可检测到椎体严重的双凹畸形，而轻度双凹畸形仅能通过MRI形态测量检测到。
