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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