While recipients of tattoos select and volunteer for the process, knowing exactly what they will get, cancer patients often receive three small tattoos when undergoing radiation therapy, according to News Works.
“You want to be dead on the mark,” Allysa Green, a therapist at Fox Chase Cancer Center, told News Works. “So it’s kind of like a map to guide us. It’s also a permanent record. So, God forbid if patients ever had to come back to be retreated.”
Technicians at hospitals also use small, gold pieces attached to a moving mass within someone’s body in order to treat a specific area when the patient is in therapy.
To read more about the marks from radiation therapy and common misconceptions about the process click here.