低场磁共振在脑疾病诊断应用的若干问题探讨

Utilization of low-field MR scanner on cerebral diseases

神经系统检查一直占据磁共振扫描的多数,据东软远程会诊系统对148家二级甲等及以下级别医院的磁共振检查部位的统计,仅头部检查就占全部检查的33.0%。然而,放射科对低场磁共振的使用尚存在许多问题,例如:扫描序列应用不当或缺失;没有充分利用三维成像(轴、矢、冠状位);对平扫已经发现病变的没有进行对比剂增强扫描;以及注射对比剂剂量不足等。本文对低场磁共振在神经系统的应用存在的问题做一归纳、探讨,以期提高对低声磁共振的应用能力。

Central nervous system examination takes the majority of MR scan in clinical practice.A statistic data by Neusoft from 148 second-rank hospitals which equipped with low-field MR scanners showed that brain MR examination occupied 33.0% of the total studies.Although it is expected that the low-field MR scanner could fulfill the requirement of brain examination in most cases,there are still some problems remained due to the major drawback of low signal-to-noise ratio of lowfield MR imaging.Recent improvements in low-field MR scanners have generated a renewed interest in low-field MR imaging with higher image quality and shorter scan times.In this article,we reviewed brain imaging in low-field MR,focusing on the imaging feature of intracranial hemorrhage,application of pulse sequences and the usage of contrast medium.