Artifacts in functional magnetic resonance imaging from gaseous oxygen

S. Bates, Z. Yetkin, A. Jesmanowicz, J. S. Hyde, P. A. Bandettini, L. Estkowski, V. M. Haughton

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Unexpectedly large fluctuations in signal intensity wen identified in the functional MRI (FMRI) of normal subjects breathing pure oxygen intermittently. To test the hypothesis that the signal changes were due to fluctuating concentrations of gaseous (paramagnetic) oxygen in the magnetic field, echo planar gradient echo images were acquired of a phantom contiguous to an oxygen mask through which pure oxygen was administered intermittently via plastic tubing. As a control, room air was administered intermittently or oxygen continuously in the same experimental protocol. Signal intensity changes of up to 60% temporally correlated with the administration of oxygen were produced in the phantom. In functional images prepared from the echo planar images, the signal intensity changes resulted in artifacts especially at interfaces in the phantom. The intermittent administration of pure oxygen during acquisition of data for FMRI may produce signal intensity changes that simulate or obscure function.

Original languageEnglish (US)
Pages (from-to)443-445
Number of pages3
JournalJournal of Magnetic Resonance Imaging
Volume5
Issue number4
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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