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Quality Assurance

Quality Assurance

Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...

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Related Experiment Video

Updated: Dec 2, 2025

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

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Published on: December 20, 2024

Development of an HDR-BT QA tool for source position verification.

Yu Kumazaki¹, Ryuta Hirai¹, Mitsunobu Igari¹

¹Department of Radiation Oncology, Saitama Medical University International Medical Center, Saitama, Japan.

Journal of Applied Clinical Medical Physics

|November 2, 2020

Summary

A new quality assurance (QA) tool was developed for high-dose-rate brachytherapy (HDR-BT) to verify source positions. This tool effectively cross-checks actual and planned source positions, ensuring treatment accuracy.

Keywords:

HDR QA phantom applicator modeling applicator offset source position

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Area of Science:

Medical Physics
Radiation Oncology
Quality Assurance

Background:

Accurate source positioning is critical in high-dose-rate brachytherapy (HDR-BT).
Existing quality assurance (QA) methods may require enhancement for precise verification.

Purpose of the Study:

To develop and evaluate a novel QA tool for verifying source positions in HDR-BT.
To assess the tool's effectiveness in comparing actual and planned source locations.

Main Methods:

A cuboid phantom with embedded Fletcher-Williamson applicators was fabricated.
Radiopaque markers and Gafchromic films were used to determine source positions.
A 3D image-guided brachytherapy plan was created, and source positions were verified using the developed tool.

Main Results:

Source position errors between film and the radiation treatment planning system (RTPS) were within 0.5 mm.
Applicator offset values showed good agreement with treatment planning (6 mm).
The QA tool's expanded measurement uncertainty was determined to be 0.87 mm (k=2).

Conclusions:

The developed HDR-BT QA tool provides effective verification of source positions.
This tool facilitates cross-checking of actual and planned source positions on the RTPS.
The tool enhances the quality assurance process in HDR-BT treatments.