The CIRS Dynamic Platform provides an economical, user-friendly solution for the complex tasks associated with tumor motion and patient positioning in radiation therapy. The device enables precisely controlled inferior-superior motion up to 50 mm for any phantom up to 70 lbs. A removable pin system in the main platform allows consistent placement and fixation of almost any phantom, and traditional laser alignment marks enable accurate positioning of the entire device. Platform motion is completely controlled by software. Numerous options are available.