Robust MR eye scanning: blink detection and correction using field probes
Joep Wezel1, Anders Garpebring2, Andrew G. Webb1, Matthias J. van Osch1, and Jan-Willem M. Beenakker3
1Radiology, Leiden University Medical Center, Leiden, Netherlands, 2Radiation Sciences, Umeå University, Umeå, Sweden, 3Ophthalmology, Leiden University Medical Center, Leiden, Netherlands
Eye-blinks result in significant artifacts in
ocular MRI scans, often masking important clinical pathologies, such as small ocular
tumors. The aim of this study is to detect and correct for these eye-blinks. We
use a fluorine-based field probe to detect these eye-blinks via changes in the
local magnetic field. The field probe measurements are linked to the MR-scanner which
subsequently automatically reacquires the motion-corrupted part of k-space.
This method effectively corrects for the main origin of image artifacts in
ocular MRI, and thereby significantly improves the image quality in a clinical
setting.
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