Cardiac Aggressive Risk Mitigation in Thoracic Radiotherapy (CARMA) Trial

Inclusion Criteria: * Any stage (I-IV) malignancy being treated with high dose (≥30 Gy) radiotherapy where the heart is in the treatment field. * Have Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0-2. * Planning to receive standard of care radiotherapy treatments. * Access to a smart device that has the capability to sync to the devices. * Written informed consent obtained from subject and ability for subject to comply with the requirements of the study. * Ability to read, write and understand English. Exclusion Criteria: * Known allergy to surgical steel or elastomer/rubber. * Heart attack within 6 months prior to study enrollment. * Severe and/or active scleroderma or systemic lupus erythematosus.