To monitor the breathing status of a subject and to synchronize data acquisition with respiration, external sensors, such as respiratory bellows, are routinely used. These sensors probe only the local breathing motion, and, hence, their signal quality can vary significantly depending on the individual subject’s physiology and morphology as well as the experience of the MR operator. Recently, optical sensors were proposed as an alternative. The purpose of this work was to compare the signals obtained by an optical sensor and by a pressure-based sensor with respect to their ability to represent the true liver motion during breathing.
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