We developed a low-cost and simple MR-compatible respiratory motion simulator to support proof-of-concept studies of MR monitoring approaches with respiration-induced organ motion. The motion system integrates pneumatic control via an actuator subsystem outside the MRI and coupled via plastic tubing to a compressible bag for distention and retraction within the MRI motion subsystem and phantom within the MRI scanner. The proposed respiratory motion simulator provided consistent periodic respiratory motion with displacement in the range 3.7-9.0 mm. The respiratory simulator could be easily assembled with off-the shelf and 3D-printed parts, based on open-source design models.
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