A reconfigurable multi-plate respiratory motion phantom with integrated stereo-vision verification

To investigate thoracoabdominal surface respiratory motion and monitor the corresponding displacement of external targets, a respiratory motion phantom driven by lead-screw stepper motors was developed to simulate physiologically relevant surface movements. A binocular vision-based monitoring system was designed to accurately track the motion of targets affixed to the phantom’s surface. The phantom replicates prescribed respiratory motion, while the monitoring system continuously records target positions and reconstructs their motion trajectories. Experimental results demonstrate that the average measurement error of the monitoring system is 1.5911%. Under a predefined respiratory pattern, the system measured a vertical displacement of 14.472 mm for the target, closely matching the reference amplitude of 14.665 mm, with a relative error of 1.3161%. The Pearson correlation coefficient between the measured and reference motion curves within a single cycle reached 0.9828. These findings confirm that the developed phantom can effectively reproduce thoracoabdominal surface respiratory motion, and the proposed monitoring system enables accurate tracking of target motion on the phantom’s surface.