Hi Chris, we use the standard 3mm/degree tolerances, which work well in the vast majority of patients. If a lady is struggling to hold the breath hold reliably we will widen the tols up to 5mm. We’ve never turned off the beam hold and I cant see us doing that at all. We’ve not had a situation where extra coaching, or widening the tols hasnt worked
Same 3mm tols used for all patients
We spend a lot of time at pre-treatment assessing if the patients can reliably hold breath hold, and will exclude those who cant.
The only other thing we’ve found is adjusting the ROI can help, but its very patient shape specific.
Sorry I cant be more help