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MR angiography using spin-lock flow tagging

✍ Scribed by Haim Azhari; Charles A. McKenzie; Robert R. Edelman

Book ID
102531222
Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
185 KB
Volume
46
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

A method for MR angiography using an RF labeling technique is suggested. The method utilizes a slice‐selective spin‐lock pulse sequence for tagging the spins of inflowing blood. The pulse sequence begins with a spatially selective 90°~x~ RF pulse, followed by a nonselective composite locking pulse of 135°~y~ − n[360°~y~]‐135°~y~ and by a 90°~‐x~ pulse. A spoiler gradient is then applied. A rapid imaging stage, which yields a T~1~ρ‐weighted signal from the tagged spins, completes the sequence. Untagged spins are thoroughly dephased and consequently suppressed in the image. Thus, contrast is obtained without an injection of a contrast material or image subtraction. Furthermore, the flow of the tagged bolus can be visualized. The sequence was implemented on phantoms and on human volunteers using a 1.5T scanner. The results indicate the feasibility of the suggested sequence. Magn Reson Med 46:1041–1044, 2001. © 2001 Wiley‐Liss, Inc.

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