- Joined
- Aug 22, 2020
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- 22
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- 47
Hi all,
Silly question, wanted to get your thoughts. For standard frac or hypofrac prostate RT, if I’m doing daily CBCT and fiducials, why does rectal filling matter at all? I understand the dogma - a large rectum pushes the prostate anteriorly and so you could miss anteriorly and include more rectum if aligning to bony anatomy on daily kv imaging. But I feel this was more an issue in the non CBCT era. Now, if you can just align to the prostate itself, shouldn’t daily changes in rectal filling matter less? Unless you believe that the enlarged rectum actually deforms the prostate shape into something smaller, in which case I would agree it makes a difference, but I’d be happy to see data to support this if true.
Silly question, wanted to get your thoughts. For standard frac or hypofrac prostate RT, if I’m doing daily CBCT and fiducials, why does rectal filling matter at all? I understand the dogma - a large rectum pushes the prostate anteriorly and so you could miss anteriorly and include more rectum if aligning to bony anatomy on daily kv imaging. But I feel this was more an issue in the non CBCT era. Now, if you can just align to the prostate itself, shouldn’t daily changes in rectal filling matter less? Unless you believe that the enlarged rectum actually deforms the prostate shape into something smaller, in which case I would agree it makes a difference, but I’d be happy to see data to support this if true.