The first goal of this project is to validate the superiority of semi-permanent marks used in conjunction with specialized light-based surface imaging (SIGRT) in an effort to phase out the use of permanent tattoos for the investigator's patients. The secondary goal of this project is to validate the superiority of specialized light-based surface imaging for daily radiation set-up compared to standard-of-care imaging methods using ionizing radiation, such as weekly port films or cone-beam CT (CBCT) scans during a radiation therapy course for breast cancer.

We will assess physical functioning, daily physical activity with wearable activity monitors, biological markers (serum and salivary cortisol), diet, program adherence, as well as psycho-social measures of physical, mental, and spiritual wellbeing. In addition, BCS will be asked to describe their best day possible and their typical day. We will conduct a qualitative analysis from their responses to identify endorsement of themes.