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10:35
Stereotactic Radiosurgery for Gynecologic Cancer
Published on: April 17, 2012
18.7K
Dosimetric evaluation of gynecological HDR brachytherapy using an in-house phantom and RPLGDs
Itsaraporn Konlak1, Taweap Sanghangthum1, Chulee Vannavijit2
1Division of Radiation Oncology, Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, 10330, Thailand.
Physical and Engineering Sciences in Medicine
|January 28, 2026
Summary
This study developed a 3D-printed phantom for verifying radiation doses in gynecological brachytherapy. Radiophotoluminescent glass dosimeters (RPLGDs) confirmed accurate dose delivery, ensuring quality assurance in treatment planning systems.
Area of Science:
- Medical Physics
- Radiation Oncology
- Biomedical Engineering
Background:
- Treatment planning systems (TPS) calculate radiation doses for brachytherapy.
- Verifying TPS accuracy is crucial, especially for intracavitary brachytherapy with complex dose gradients.
- 3D-printed phantoms offer a method for validating TPS dose calculations.
Purpose of the Study:
- To create an in-house 3D-printed phantom for gynecological brachytherapy verification.
- To assess the dosimetric accuracy of a TPS using radiophotoluminescent glass dosimeters (RPLGDs).
- To quantify dose differences between TPS calculations and measurements under clinical conditions.
Main Methods:
- Designed and constructed an in-house phantom holder accommodating various applicators for intracavitary brachytherapy.
- Utilized RPLGDs for precise dose measurements within the phantom at critical points (Point A, Point B, bladder, rectum).
- Quantified variations between calculated and measured doses across six clinical treatment plans.
Main Results:
- RPLGDs showed linear dose response up to 10 Gy with minimal uncertainty (3.3%).
- Dose differences between measured and calculated values were within acceptable clinical ranges: Point A (+1.99 ± 1.11%), Point B (1.01 ± 0.02 Gy), bladder (+4.42 ± 2.56%), and rectum (+3.53 ± 1.44%).
Conclusions:
- An in-house 3D-printed phantom combined with RPLGDs provides accurate dosimetry for intracavitary brachytherapy.
- This method is effective for quality assurance, verifying delivered radiation doses in clinical practice.
- The study validates the use of 3D-printed phantoms for ensuring TPS accuracy in gynecological brachytherapy.
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