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BLADDER/RECTUM (How:question: (Compared weekly CT scans taken during the…
BLADDER/RECTUM
How:question:
Compared weekly CT scans taken during the course of radical radiation treatment to an initial planning CT scan
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Patients had a full bladder and the rectum and bladder volumes were compared to that of the initial scan.
Further CT scans taken during the remainder of the treatment showed that both volumes tended to stabilize relative to the first in-treatment scan
What :question:
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Both bladder and rectum were found to decrease in volume during the course of treatment former rate of 6% per week
Found that both bladder and rectum volumes tend to decrease between the CT planning and their first in-treatment CT taken about 2 weeks later showing both volumes tended to stabilize relative to the first in treatment.
When:question: :
Miralbell et al. studied the displacement of bladder tumors. The bladder was filled with 170 cm3 of contrast fluid, of which 100 cm3 was subsequently removed. The resulting tumor displacement was measured by comparing CT scans taken at the two filling levels. Maximum displacements of 15 mm were measured in the SI direction.
Miralbell et al. also investigated the use of a urinary catheter balloon that was filled with 80 cm3 liquid.Using weekly orthogonal x-ray films, an average motion of about 5 mm was observed.
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Why :question:
An average decrease in rectal diameter of 15 mm between an initial CT and a second CT obtained after patients were treated to an absorbed dose of about 40 Gy
Both the rectum and bladder volumes were found to decrease with time during the course of the treatments, the former at a rate of about 6% per week, and the latter by about 4% per week
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