Topics:
Breast Cancer • Radiation Oncology
Do you always use the same CTV and PTV expansions when defining fields for lumpectomy bed boost?
Answer from: Radiation Oncologist at Community Practice
If using electron beams, we expand by 2 to 2.5 cm (based on electron energy) around the lumpectomy cavity. If using photons, then we use 1 cm for CTV and 3 mm for PTV.
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Answer from: Radiation Oncologist at Community Practice
No argument with 1cm from seroma/clips to CTV (carving out skin rind/air and pec/chest-wall if not invaded); however, having practiced in a variety of centers with varying technology, I'd say the PTV expansion necessarily depends upon the image guidance techniques and motion control/monitoring syste...
Answer from: Radiation Oncologist at Academic Institution
As a follow-up to the other answers - is there an evidence-based rationale for adding a CTV margin to the lumpectomy cavity/seroma in the boost setting after WBI? I can somewhat understand a CTV margin for APBI given concerns for the marginal miss, but is the process of adding a CTV margin to the lu...
Comments
Radiation Oncologist at Bismarck Cancer Center
I'm not aware of any patterns of failure, data sup...
I'm not aware of any patterns of failure, data sup...
Radiation Oncologist at Michigan Medicine
Honestly this is what I was getting at with the qu...
Honestly this is what I was getting at with the qu...
Radiation Oncologist at Vanderbilt-Ingram Cancer Center
Thanks, @John M. Watkins, I suppose that is a reas...
Thanks, @John M. Watkins, I suppose that is a reas...
Radiation Oncologist at Bismarck Cancer Center
Great points & a good question - thanks!
Great points & a good question - thanks!
Radiation Oncologist at Northeast Radiation Oncology
As a follow up to this question - do you guys omit...
As a follow up to this question - do you guys omit...
Radiation Oncologist at Bismarck Cancer Center
Yeah, in my own practice, if we can't identify the...
Yeah, in my own practice, if we can't identify the...