Acceptance testing computerized radiation therapy treatment planning systems: direct utilization of CT scan data

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Technology

Background:

• Computerized treatment planning systems are increasingly used in radiation therapy.
• Computed tomography (CT) integration into planning systems necessitates specialized validation beyond traditional methods.
• Accurate dose calculation and target delineation are critical for effective radiotherapy.

Purpose of the Study:

• To outline a comprehensive testing protocol for CT-based radiation therapy planning systems.
• To address the unique verification requirements introduced by CT data in treatment planning.
• To evaluate the performance of a specific CT-based planning system.

Main Methods:

• Development of a testing protocol for CT-utilizing treatment planning systems.
• Verification of dimensional accuracy from CT data.
• Establishment of CT number to tissue property conversions.
• Validation of heterogeneity-corrected dose prediction algorithms.
• Assessment of autocontouring accuracy.

Main Results:

• Sample results from the Atomic Energy of Canada Theraplan L system are presented.
• Demonstrated accuracy in dimensioning verification.
• Validated CT number-to-tissue property conversions.
• Confirmed accuracy of heterogeneity-corrected dose predictions.
• Evaluated performance of autocontouring features.

Conclusions:

• The presented protocol effectively addresses the additional testing needs of CT-based radiation therapy planning systems.
• Verification of CT-specific parameters is essential for ensuring the reliability of computerized treatment planning.
• The Theraplan L system's performance indicates the feasibility of CT-integrated radiotherapy planning with rigorous validation.