低磁場MRI（0.2T）を用いたDiffusion-weighted Imageによる急性期脳梗塞診断

Diagnosis of Acute Cerebral Infarction Using Diffusion-weighted Imaging by Low Field (0.2 T) Magnetic Resonance Image

　急性期脳梗塞51例に低磁場MRI（0.2T）を用いてDWIを撮影し，脳梗塞診断の有用性を検討した。1）急性期脳梗塞51例中46例（90.2％）はDWIで診断可能であったが，TIAの4例と穿通枝梗塞の1例は診断できなかった。2）DWIの描出時間は最短で皮質梗塞が1時間20分，穿通枝梗塞が3時間で，高磁場MRIと遜色がなかった。3）低磁場MRIではline scan法のため，撮影時間が長くかかることが問題であった。

The purpose of this study is to confirm the diagno-sis 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 exam-ined on diffusion-weighted imaging using low field MRI within 48 hours after clinical symptoms. Diffu-sion-weighted imaging was examined using line scanmethod. 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 dif-fusion-weighted imaging.