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Abstract #2548

In vivo 7T MR imaging triggered by phase information obtained from video signals of the human skin

Nicolai Spicher 1 , Markus Kukuk 1 , Mark E. Ladd 2,3 , and Stefan Maderwald 2

1 University of Applied Sciences and Arts Dortmund, Dortmund, Germany, 2 Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany, 3 Division of Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany

A video of the forehead is used to offer an alternative to contact-based triggering hardware. The video is obtained from a camera installed above the subjects head in a 7T MR bore; triggers are computed in real-time by an algorithm based on phase information of mean pixel intensities. During nonenhanced MR angiography of the lower extremities of one volunteer, triggers from the vendor-provided pulse oximeter and from the algorithm were saved. Results suggest that the video-based approach is principally able to reproduce the triggers obtained by pulse oximetry but suffers in case of the head motion.

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