Development and first implementation of a novel multi-modality cardiac motion and dosimetry phantom for radiotherapy applications.

Background: Cardiac applications in radiation therapy are rapidly expanding including magnetic resonance guided radiation therapy (MRgRT) for real-time gating for targeting and avoidance near the heart or treating ventricular tachycardia (VT).

Purpose: This work describes the development and implementation of a novel multi-modality and magnetic resonance (MR)-compatible cardiac phantom.

Methods: The patient-informed 3D model was derived from manual contouring of a contrast-enhanced Coronary Computed Tomography Angiography scan, exported as a Stereolithography model, then post-processed to simulate female heart with an average volume.