Okuyama T, Sasamori Y, Takahashi H, Mikami J, Ishii Y, Okada K, Shirafuji N, Kashiwakura T
Department of Neurosurgery, Takahashi Neurosurgical Hospital, Sapporo, Japan.
No To Shinkei. 2000 Sep;52(9):789-93.
The purpose of this study is to confirm the diagnosis of acute cerebral infarction on diffusion-weighted imaging using low field (0.2 T) magnetic resonance image(MRI). Acute cerebral infarctions in 51 patients were examined on diffusion-weighted imaging using low field MRI within 48 hours after clinical symptoms. Diffusion-weighted imaging was examined using line scan method. Twenty-four cases were cortical infarction, and twenty-two cases were perforating infarction. In five cases out of 51 cases, ischemic regions were not detected as abnormal high signal intensity area on diffusion-weighted imaging. Four cases of no abnormal detection were transient ischemic attack, and the other one was a perforating infarction. The earliest detection time in cortical infarction cases was 1 hour and 20 minutes. On the other hand, the earliest detection time in perforating infarction cases was 3 hours. Detective ability for acute cerebral infarction on diffusion-weighted imaging by low field MRI was depending on both size and lesion of infarction. That is to say, either small size or brain stem infarction was hard to detect. Thin slice and vertical slice examination for the infarction may improve to diagnose in low field MRI. Our conclusion is acute cerebral infarction was able to be diagnosed on diffusion-weighted imaging by low field as well as high field MRI.
本研究的目的是使用低场（0.2T）磁共振成像（MRI）通过扩散加权成像来确诊急性脑梗死。对51例急性脑梗死患者在出现临床症状后的48小时内使用低场MRI进行扩散加权成像检查。采用线扫描法进行扩散加权成像检查。24例为皮质梗死，22例为穿支梗死。在51例患者中，有5例在扩散加权成像上未检测到缺血区域为异常高信号强度区。4例未检测到异常的为短暂性脑缺血发作，另1例为穿支梗死。皮质梗死病例的最早检测时间为1小时20分钟。另一方面，穿支梗死病例的最早检测时间为3小时。低场MRI通过扩散加权成像对急性脑梗死的检测能力取决于梗死的大小和部位。也就是说，梗死灶小或位于脑干时难以检测到。对梗死灶进行薄层和垂直层面检查可能会提高低场MRI的诊断效果。我们的结论是，低场MRI通过扩散加权成像与高场MRI一样能够诊断急性脑梗死。
