Document Detail

MR angiography of intracranial aneurysms: a comparison of 0.5 T and 1.5 T.
MedLine Citation:
PMID:  9152576     Owner:  NLM     Status:  MEDLINE    
The objective of this paper is to compare the diagnostic efficacy of 3 DFT time-of-flight MR angiography (MRA) at middle-field-strength and high-field-strength in diagnosis of intracranial aneurysms. Thirty-one patients, including 26 patients with angiographically confirmed intracranial aneurysms (n = 28), underwent MRA at 0.5 and 1.5 T. Images were interpreted by six trained observers who were blinded to diagnosis. Twelve projections of MRA of the circle of Willis, by maximum-intensity projection algorithm, were reviewed using continuous confidence-judgement scales. It was found that MRA at 1.5 T was more sensitive than that at 0.5 T in detection of aneurysms. The sensitivity of six observers ranged between 50 and 64% (mean 56%) at 0.5 T, and between 61 and 86 86% (mean 75%) at 1.5 T. In the smaller aneurysms less than 5 mm, the differences between the units became greater. The sensitivity for small aneurysms ranged from 23 to 54% (mean 32%) at 0.5 T, and from 31 to 69% (mean 58%) at 1.5 T. Our conclusion was that high field strength confers higher accuracy in the detection of intracranial aneurysms with MRA with current-generation MR imagers.
Y Korogi; M Takahashi; N Mabuchi; T Watabe; Y Shiokawa; H Shiga; T O'Uchi; T Nakagawa; H Miki; Y Horikawa; S Fujiwara; M Furuse
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Computerized medical imaging and graphics : the official journal of the Computerized Medical Imaging Society     Volume:  21     ISSN:  0895-6111     ISO Abbreviation:  Comput Med Imaging Graph     Publication Date:    1997 Mar-Apr
Date Detail:
Created Date:  1997-07-17     Completed Date:  1997-07-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8806104     Medline TA:  Comput Med Imaging Graph     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  111-6     Citation Subset:  IM    
Department of Radiology, Kumamoto University School of Medicine, Japan.
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MeSH Terms
Basilar Artery / pathology
Cerebral Angiography
Cerebral Arteries / pathology
Choroid Plexus / blood supply
Circle of Willis / pathology
Image Enhancement / methods
Intracranial Aneurysm / diagnosis*
Magnetic Resonance Angiography* / methods
Observer Variation
Ophthalmic Artery / pathology
Retrospective Studies
Sensitivity and Specificity
Single-Blind Method

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

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