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Quality control of CT system for treatment planning using the polybinary calibration method.

Nobuyuki Kanematsu¹

¹Department of Medical Physics, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba-shi, Chiba-ken, 263-8555, Japan. nkanemat@nirs.go.jp

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics

|September 2, 2003

Summary

This study proposes a quality assurance guideline for CT systems in radiotherapy. It details methods for accurate CT number interpretation, crucial for heavy charged particle therapy range calculations.

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Area of Science:

Medical Physics
Radiotherapy Technology
Imaging Science

Background:

Accurate CT number interpretation is vital for radiotherapy treatment planning.
Variations in CT systems and scanning conditions can impact quantitative accuracy.
Heavy charged particle radiotherapy requires precise range calculations for effective treatment.

Purpose of the Study:

To propose a comprehensive guideline for quality assurance of CT systems used in radiotherapy treatment planning.
To address the critical need for quantitative CT number accuracy, particularly for heavy charged particle therapy.
To provide standardized procedures for ensuring the reliability of CT imaging in radiation oncology.

Main Methods:

Adoption of the polybinary calibration method to correct CT number variations.
Development of practical procedures for commissioning CT systems.
Documentation of constancy testing methodologies to address uncertainty sources.

Main Results:

A proposed guideline for CT system quality assurance in radiotherapy.
Implementation of a polybinary calibration method for quantitative CT number correction.
Established procedures for commissioning and constancy testing to minimize uncertainties.

Conclusions:

The proposed guideline enhances the quality assurance of CT systems for radiotherapy.
Accurate CT number interpretation using the polybinary method improves range calculations in heavy charged particle radiotherapy.
Standardized QA procedures are essential for reliable and safe radiotherapy delivery.