ISSN:
1432-1084
Schlagwort(e):
Magnetic resonance
;
Magnetic resonance-pulse sequences
;
Magnetic resonance angiography
;
Carotid arteries
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
Abstract Three-dimensional (3D) time-of-flight methods are used to study anatomy and pathology of the supra-aortic arteries because they are quick and optimal for fast-flow conditions. Although highest signal intensities can be obtained by orientating the sections perpendicular to the long axis of the artery (axial), sagittal and/or coronal slice orientations cover the regions of interest with smaller volumes and therefore give adequate information in less time. Sagittal and coronal time-of-flight magnetic resonance angiography (MRA) gave excellent results (sensitivity 92.3%, specificity 85.7%, accuracy 90.9%) compared with intra-arterial digital subtraction angiography (DSA) in 30 patients, when coronal and sagittal acquisition were combined for final diagnosis. These values decreased to 69.6%/57.1%/66.7% for coronal and 83.6%/78.6%/81.7% for sagittal sections. Reasons for the variable extent of signal dropout at the site of a stenosis and for the different appearances of post-stenotic slow flow in the various planes are explained by T1 phenomena and intravoxel phase dispersion due to variable parameter settings.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00451301
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