Effect of motion outside the field of view on functional MR

F. Zerrin Yetkin, Victor M. Haughton, Robert W. Cox, James Hyde, Rasmus M. Birn, Eric C. Wong, Robert Prost

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

PURPOSE: To evaluate the effect of objects moving outside the field of view on functional MR imaging. METHODS: Echo-planar image sequences were acquired in the sagittal plane of a stationary phantom or of the head of a volunteer subject while a second phantom was moved periodically outside the field of view. The signal intensity changes in each pixel within the field of view were measured. RESULTS: Movement of the phantom outside the field of view produced signal intensity changes in the field of view that equaled or exceeded typical functional activation without the latency that characterizes activation. The greatest changes occurred at the bottom and top edges in the phantom and at the interfaces in the head. CONCLUSION: If temporally correlated with the performance of a task, movement of objects or tissues outside the field of view may produce artifactual changes in signal intensity. The artifactual signal intensity changes were characterized by their location, greater magnitude, and more rapid rise to maximum than seen with typical "activation.".

Original languageEnglish (US)
Pages (from-to)1005-1009
Number of pages5
JournalAmerican Journal of Neuroradiology
Volume17
Issue number6
Publication statusPublished - 1996

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Keywords

  • Functional
  • Magnetic resonance
  • Phantoms

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Yetkin, F. Z., Haughton, V. M., Cox, R. W., Hyde, J., Birn, R. M., Wong, E. C., & Prost, R. (1996). Effect of motion outside the field of view on functional MR. American Journal of Neuroradiology, 17(6), 1005-1009.