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題 名 | 擴散影像在腦缺血及梗塞診斷上的應用價值=The Value of DWI in the Diagnosis of Cerebral Infarction and Ischemia |
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作 者 | 鄧木火; 高怡宣; 鄭慧正; 凌憬峰; 羅兆寶; 陳行素; 郭萬祐; 姜仁惠; 張政彥; | 書刊名 | 中華放射線醫學雜誌 |
卷 期 | 23:4 1998.08[民87.08] |
頁 次 | 頁121-126 |
分類號 | 415.81 |
關鍵詞 | 磁振造影術; 擴散影像; 大腦缺血; 腦梗塞; 大腦; Magnetic resonance; MR; Diffusion-weighted images; Cerebral ischemia; Cerebral infarction; Brain; |
語 文 | 中文(Chinese) |
中文摘要 | 三十位有腦缺血或腦梗塞患者做了擴散磁振影像(single-shot, echo-planar diffusion-weighted MR images, 以下簡稱為DWI),三張DWI影像上分別使用到三個互相垂直不同方向的擴散梯度磁場。二十七位患者在最近發作後3小時至14天做的MRI檢查中的三張DWI均可見到影像訊號變強的區域。其中有二個病例之病灶只有在DWI可辨識,在同時做的常規MRI均為正常:他們是發作後3小時的急性缺血或急性期腦梗塞。另有八例為發作後24小時以上的檢查只有在DWI可辨識為急性或亞急性腦梗塞,而在常規MRI難以辨認:有二例小病灶在腦皮質,一例在腦室壁,二例為鄰近陳舊性梗塞處,三例為小病灶且鄰近腦室周圍之白質高信號區。另外三位患者有陳舊性腦梗塞區域非因急性中風而來檢查,該處在DWI之影像較暗。因此,用DWI可以發現腦缺血與急性(或亞急性)腦梗塞。急性(或亞急性)腦梗塞與腦缺血之病灶不會因與腦溝或腦室鄰近而難以辨識,並可與陳舊性腦梗塞及腦室周圍之白質病變區別。DWI將成為MRI在診斷腦缺血與腦梗塞時不可缺少的波序。 |
英文摘要 | This is to report the value of diffusion-weighted images (DWI) in the diagnosis of cerebral infarction and ischemia. Thirty patients with brain ischemia or infarction underwent diffusion-weighted EPI SE (TR/TE=4700/118 ms) study at a 1.5 T MRI (Vision, Siemens, Erlangen, Germany). The DWI was performed in three axes with b value equals to 1000 s/mm��. MRI of these cases all had routine brain studies including axial T1 SE (TR/TE=550 ms/14ms) and T2 TSE (TR/TE=3000ms/20ms, 90ms) for comparison. In twenty seven patients whose MR examinations were performed 3 hours to 14 days after acute onset of clinical symptoms had consistent high signal change in the same area on the three DWI with different diffusion gradient direction. In two patients, the DWI was the only positive examination and the conventional MRI performed at the same time showed no abnormal change. They were done three hours after onset of clinical symptoms. Only DWI can tell the acute or subacute nature of infarct, while conventional MRI can not tell in eight patients. The were done more than 24 hours after onset of clinical symptoms. These eight cases were :two cortical lacunar infarcts, one periventricular lacunar infarct, two located adjacent to old infarct, three adjacent to periventricular arteriosclerotic angiopathic leukoencephalopathy. Another three patients only had old infarct where low signal was found in the DWI. DWI is sensitive for detection of brain ischemia, acute and subacute infarction. It can be shown well even if the lesion is in the periventricular or in cortical sulci adjacent to CSF spaces. DWI can be used to differentiate brain ischemia, acute (or subacute) infarct from old infarct and arteriosclerotic angiopathic leukoencephalopathy. DWI will become routine procedure in the diagnosis of brain ischemia and acute (or subacute) infarct. cedure in the diagnosis of brain ischemia and acute (or subacute) infarct. |
本系統中英文摘要資訊取自各篇刊載內容。