A device (10) for a patient to lie on during a medical imaging procedure includes a main body (12). A matrix of pressure sensors (16) disposed on a top surface (14) of the main body are configured to continuously measure pressure across the top surface. At least one electronic processor (22) is operatively connected to read the pressure sensors. A non-transitory storage medium stores instructions readable and executable by the at least one electronic processor to use the matrix of pressure sensors to perform at least one of: a sag estimation operation (200)； a motion estimation operation (300)； and a respiratory monitoring operation (400).
