Comparison of magnetic resonance imaging methods for examinations of abdominal aortic aneurysms.
Invest Radiol
; 30(10): 595-603, 1995 Oct.
Article
in En
| MEDLINE
| ID: mdl-8557499
ABSTRACT
RATIONALE AND OBJECTIVES:
Different magnetic resonance imaging techniques were compared with respect to available anatomic information regarding abdominal aortic aneurysms (AAA) and regions involved in thrombosis.METHODS:
Twenty patients with AAA were examined by turbo spin-echo (TSE) imaging of coronal and transverse slices, resulting in black blood images. Bright blood imaging was performed using a spoiled gradient-echo sequence with gradient moment nulling. Sets of 25 to 50 thin slices were recorded sequentially in a single slice mode using coronal and transverse orientation. Both sets of bright blood images were reconstructed by maximum intensity projection.RESULTS:
In all patients, the size and shape of the AAA could better be assessed by the TSE images than by the gradient-echo images. In contrast, reliable differentiation of thrombotic areas and of the perfused lumen was possible in only 56% of the slices recorded by TSE imaging but in 94% of the gradient-echo images. The two-dimensional inflow technique provided clearly higher sensitivity even to slow blood flow than TSE imaging. Maximum intensity projection reconstructions from sets of coronal two-dimensional inflow images often did not depict the lower part of the AAA because of saturation effects, whereas sets of transverse slices provided complete angiograms of the aortoiliac vascular tree.DISCUSSION:
At this time, no single magnetic resonance method can provide all essential information. A comprehensive examination should include TSE imaging for topographic assessment and transverse two-dimensional inflow imaging for analysis of thrombotic areas.
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Database:
MEDLINE
Main subject:
Magnetic Resonance Imaging
/
Image Enhancement
/
Aortic Aneurysm, Abdominal
Type of study:
Diagnostic_studies
/
Observational_studies
Limits:
Aged
/
Aged80
/
Humans
/
Male
/
Middle aged
Language:
En
Year:
1995
Type:
Article