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Abstract #0905

2.5D MRI of the Vocal Fold Oscillation using Single Point Imaging with Rapid Encoding

Johannes Fischer1, Ali Caglar Özen1,2, Matthias Echternach3, Louisa Traser4, Bernhard Richter4, and Michael Bock1
1Dept.of Radiology, Medical Physics, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, 2German Consortium for Translational Cancer Research Freiburg Site, German Cancer Research Center (DKFZ), Heidelberg, Germany, 3Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University, Munich, Germany, 4Institute of Musicians' Medicine, Freiburg University Medical Center, Germany Faculty of Medicine, University of Freiburg, Freiburg, Germany

Single point imaging with rapid encoding (SPIRE) can dynamically image the oscillations of the vocal folds in the coronal plane with sub-milisecond temporal resolution. To add spatial encoding in the third dimension, a slower frequency encoding gradient was applied in slice direction, where motion is minimal. Electroglottography and projection navigators are used to detect shifts in the larynx position, which are corrected during reconstruction. The velocity of the mucosal wave is estimated from the images.

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