PMID: 9194428Jun 1, 1997Paper

MR angiography of ruptured aneurysms in acute subarachnoid hemorrhage.

AJNR. American Journal of Neuroradiology
M IdaM Yamashita

Abstract

To determine the efficacy of high-resolution MR angiography for the prospective diagnosis of ruptured aneurysms in acute subarachnoid hemorrhage. We used 3-D time-of-flight MR angiography with a large image matrix (193 x 512 frequency-encoding steps), magnetization transfer saturation, and a variable flip-angle excitation (tilted optimized nonsaturating excitation [TONE]) to study 28 patients with acute subarachnoid hemorrhage. The MR angiograms were compared with intraarterial digital subtraction angiographic (IA-DSA) images. Thirty-five (90%) of 39 aneurysms were detected prospectively with MR angiography. At least one aneurysm was identified with MR angiography in 25 (96%) of 26 patients with aneurysms proved by IA-DSA. Although four aneurysms were missed prospectively, three of these were detected retrospectively with MR angiography. Six aneurysms (18%) of those evident on MR angiograms were 3 mm or less in diameter. In one patient, additional targeted maximum intensity projections were greatly helpful for the ensuing IA-DSA by determining the optimial projection angle by which to depict a ruptured aneurysm that neither routine MR angiography nor routine IA-DSA detected. High-resolution MR angiography may be a useful diagno...Continue Reading

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