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MRI signal loss due to microcirculation: Phantom studies

✍ Scribed by S. Duewell; R. Wüthrich; A. Buck; C. von Weymarn; G. K. von Schulthess

Book ID
102954525
Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
777 KB
Volume
14
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

In order to study perfusion effects in MRI under different conditions we developed two different kinds of phantoms. The first phantom exhibits linear capillary flow with several capillaries within one voxel. The second consists of an anion exchange resin with beads forcing the spins to change directions such that they undergo accelerations and decelerations. Both phantoms were imaged with standard spin‐echo sequences and signal intensities were quantified at various echo times. Qualitative and quantitative agreements of the data with the results obtained by computations of signal toss due to spin‐phase phenomena are excellent, thus suggesting that perfusion effects can be fully understood using these phenomena. It is argued that the phantoms used in conjunction with conventional spin‐echo sequences represent a realistic model for studying true capillary networks in conjunction with specialized perfusion sequences. © 1990 Academic Press, Inc.

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