Disappearing iliac vessels: An MR phase cancellation phenomenon

J. Mayo, E. R. McVeigh, N. Hoffman, P. Y. Poon, R. M. Henkelman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Magnetic resonance images often fail to distinguish the iliac vessels on one side. Phantom studies and theoretical analysis demonstrated that this phenomenon arises from a loss of the flow void effect. At a certain angle, the additional phase accumulation that results from motion in the section-selection direction exactly cancels the additional phase accumulation from motion in the frequency-encoding direction. Thus, vessels that cut through the imaging plane near this critical angle have substantial signal intensity. This artifact can be eliminated by alternating the direction of the section-selection gradient on sequential phase encodings.

Original languageEnglish (US)
Pages (from-to)555-557
Number of pages3
Issue number2
StatePublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology


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