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[Optimization of multi-leaf collimator leaf offset table for a treatment planning system].

Daisaku Tatsumi¹

¹Department of Radiology, Osaka City University Hospital.

Nihon Hoshasen Gijutsu Gakkai Zasshi

|March 3, 2012

Summary

Accurate radiation therapy requires consistent multi-leaf collimator (MLC) leaf offset tables between linear accelerator (linac) controllers and treatment planning systems (TPS). Inconsistencies were found and corrected for an Elekta linac and Pinnacle TPS.

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Context:

Accurate dose delivery in radiation therapy relies on precise alignment between the linear accelerator (linac) and the treatment planning system (TPS).
Multi-leaf collimators (MLCs) with rounded leaf ends necessitate accurate leaf offset data for effective dose calculation and delivery.
Discrepancies in MLC leaf offset tables can lead to significant errors in radiation dose verification.

Purpose:

To investigate and resolve inconsistencies in multi-leaf collimator (MLC) leaf offset tables between an Elekta linear accelerator (linac) controller and the Pinnacle treatment planning system (TPS).
To determine an optimized MLC leaf offset table for the Pinnacle TPS to ensure accurate dose calculations.
To identify potential areas for improvement in dose verification for volumetric modulated arc therapy (VMAT).

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Summary:

Inconsistencies were identified in the MLC leaf offset tables between the Elekta linac controller and the Pinnacle TPS.
An optimal leaf offset table for the Pinnacle TPS was established through coordinated operation of the TPS and linac controller.
The study suggests revising MLC leaf transmission values and leaf offset tables within the Pinnacle TPS to enhance dose verification accuracy.

Impact:

Improved accuracy in radiation dose delivery for cancer treatment.
Enhanced reliability of dose verification for volumetric modulated arc therapy (VMAT) plans.
Potential for reducing treatment planning and delivery errors in clinical practice.