Document Detail

Diagnosis of intracranial aneurysms: accuracy of MR angiography at 0.5 T.
MedLine Citation:
PMID:  9504473     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Our goal was to determine the accuracy of MR angiography at 0.5 T for the diagnosis of intracranial aneurysms. METHODS: We retrospectively studied 140 patients, 70 with acute subarachnoid hemorrhage, who were either at high or low risk for intracranial aneurysm. Three-dimensional time-of-flight MR angiography was typically performed to cover the circle of Willis, with a volume thickness of 30 mm. Conventional spin-echo MR images and MR angiograms were reviewed together, and the results were compared with those obtained at intraarterial cerebral angiography to determine the sensitivity and specificity of MR angiography. RESULTS: Eighty-nine aneurysms (size range, 2 to 27 mm; 25 aneurysms < 5 mm) were identified at intraarterial cerebral angiography. Six aneurysms were missed by MR angiography and two were doubtful (sensitivity, 91% to 93%; specificity, 100%). Missed aneurysms were located outside the MR angiographic acquisition volume (n = 3) or on the carotid siphon (n = 3; size = 2, 3, and 5 mm). CONCLUSION: Even if MR angiography presents some restrictions in acquisition volume and spatial resolution, the detection rate of intracranial aneurysms is excellent at 0.5 T in both asymptomatic patients and in those with subarachnoid hemorrhage. A midfield system is not a restriction to the detection of intracranial aneurysms by MR examination.
C B Grandin; P Mathurin; T Duprez; G Stroobandt; F Hammer; P Goffette; G Cosnard
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  AJNR. American journal of neuroradiology     Volume:  19     ISSN:  0195-6108     ISO Abbreviation:  AJNR Am J Neuroradiol     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-05-06     Completed Date:  1998-05-06     Revised Date:  2008-02-14    
Medline Journal Info:
Nlm Unique ID:  8003708     Medline TA:  AJNR Am J Neuroradiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  245-52     Citation Subset:  IM    
Department of Medical Imaging, St Luc University Hospital, Catholic University of Louvain, Brussels, Belgium.
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MeSH Terms
Aged, 80 and over
Angiography, Digital Subtraction
Carotid Artery, Internal / pathology
Cerebral Angiography
Cerebral Arteries / pathology
Child, Preschool
Circle of Willis / pathology
Diagnosis, Differential
Image Processing, Computer-Assisted
Intracranial Aneurysm / diagnosis*
Magnetic Resonance Angiography*
Middle Aged
Retrospective Studies
Sensitivity and Specificity
Subarachnoid Hemorrhage / diagnosis*,  etiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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