Abstract
PO0261: Dosimetric Analysis of Intrafraction Bladder Filling Effect on Dose Reporting for Intracavitary Brachytherapy (IGBT)
Brachytherapy, v 23(6), pp S123-S123
Nov 2024
Abstract
Purpose/Objective(s): There have been multiple reports of bladder filling effecting Bladder EQ2 dose. Recent report suggests ICRU bladder point dose also correlates to bladder toxicity including incontinence and urgency. We aim to assess the intrafractional dosimetric variations of bladder filling on various bladder dosimetry for image guided intracavitary brachytherapy for cervical cancer including ICRU bladder point.
A retrospective review was conducted on patients with diagnosed FIGO stage IB1 - IIIC1 cervical cancer who underwent intracavitary brachytherapy with use of a tandem and ring at a dose of 700 cGy x 4 fractions. Patients who underwent hybrid applicators or tandem and ovoids were excluded. CT simulation before each fraction was used to quantify bladder volume. Treatment plans were generated using Eclipse based on CT images. Dosimetric parameters including max bladder dose, bladder D2cc, Bladder IRCU point, and bladder volume between fractions were evaluated.
A total of 7 patients and 28 fractions were evaluated. Average standard deviation between fractionation for bladder filling was 106.6 (±33.5) cm3. Average standard deviation between fractions for maximum bladder dose was 96.7 cGy (±51.0 cGy). Average standard deviation between fractions for bladder D2cc 66.3 cGy (±71.6 cGy) Average standard deviation between fractions for ICRU bladder point was 76.7 cGy (±61.8cGy). Average intrafractional dosimetric variation of the bladder were not significant between groups.
The intrafraction bladder dose assessed by D2cc and ICRU bladder were not statistically different and were similarly effected by intrafraction bladder filling and foley placement likely due to small sample size and less variation in absolute bladder volume.
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Details
- Title
- PO0261: Dosimetric Analysis of Intrafraction Bladder Filling Effect on Dose Reporting for Intracavitary Brachytherapy (IGBT)
- Creators
- Cody R. Kilar - West Virginia UniversityApril Shorthouse - West Virginia UniversitySushil Beriwal - Allegheny Health NetworkPhillip M. Pifer - West Virginia University
- Publication Details
- Brachytherapy, v 23(6), pp S123-S123
- Publisher
- Elsevier
- Resource Type
- Abstract
- Language
- English
- Academic Unit
- Radiation Oncology (and Nuclear Medicine)
- Other Identifier
- 991021931802104721