The dosimetric underpinning of bladder filling criteria for prostate image-guided volumetric modulated arc therapy.

ABSTRACT:

Objectives

Repeated CT simulation imaging is common at our institution due to failure to achieve acceptable bladder filling in patients undergoing prostate radiotherapy. There is operational value in re-assessing the validity of the bladder filling assessment criteria by comparing the quality of two plans optimized based on either an "Accepted" or "Rejected" bladder status.

Methods

Twenty prostate patients with repeated CT simulation imaging were included. For each patient, a VMAT plan created using the "Rejected" bladder was compared with the "Accepted" bladder plan. Then, delivered dose to bladder was estimated using ≥4 CBCTs to measure number of fractions with major bladderdose violation (>5% difference) for both plans. Bladder heights of fractions without major bladder d

SUBMITTER: Kong V 

PROVIDER: S-EPMC10230381 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature