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(Radiology. 2000;217:911-915.)
© RSNA, 2000

Technical Developments

Origin of a Signal Intensity Loss Artifact in Fat-Saturation MR Imaging1

Leon Axel, PhD, MD, Louis Kolman, Riad Charafeddine, MD, Scott N. Hwang, PhD and Alan H. Stolpen, MD, PhD

1 From the Department of Radiology, University of Pennsylvania Medical Center, 3400 Spruce St, Philadelphia, PA 19104. From the 1999 RSNA scientific assembly. Received October 20, 1999; revision requested November 18; revision received March 24, 2000; accepted April 4. Address correspondence to L.A. (e-mail: axel@oasis.rad.upenn.edu).

Artifactual water signal intensity loss can be observed on fat-saturation magnetic resonance (MR) images of inhomogeneous regions such as the thorax. Magnetic effects of air inclusions on fat-saturation pulses were investigated as the possible origin of this artifact. Computer simulation results agreed well with observed production of water saturation by means of nominal fat suppression in MR imaging of phantoms and a representative clinical example.

Index terms: Magnetic resonance (MR), artifact, 9*.932 • Magnetic resonance (MR), experimental studies • Magnetic resonance (MR), fat suppression, 9*.129415 • Magnetic resonance (MR), vascular studies, 9*.12942 • Test objects