radiotherapy for DCIS after surgery

Hello. I had bilateral radiation so I had to do the deep breath hold as well. You don’t need to hold your breath for a long period, as it’s a start/stop sort of method. I didn’t find it difficult, but there was one time when the machine stopped automatically when I wasn’t doing it right, and I’m very glad it did. I also can’t understand why there’s not one standard machine they all use, but I’m gonna guess it’s for the reasons you listed above. I honestly don’t know how they manage to make it safe for people who can’t hold their breath, but I’m like you in that I’d prefer the machine does it automatically. Radiation is not something to be taken lightly, as it does a lot of damage, and the heart needs to be protected at all cost. And humans do make mistakes, even experts in the field. Then again, so do machines. I’m not sure how to help you, except to say you’re definitely not overreacting for being concerned about this.