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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Verification of tomotherapy dose delivery.

S M Pelagade¹, B R Paliwal

¹Department of Medical Physics, The Gujarat Cancer & Research Institute, NCH Campus, Asarwa, Ahmedabad-380016, India.

Journal of Medical Physics

|January 26, 2010

Summary

This study validated patient-specific delivery quality assurance (DQA) plans for helical tomotherapy. Results show excellent agreement between calculated and measured doses, ensuring treatment accuracy for various cancer sites.

Keywords:

Dose gamma index tomotherapy

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Quality Assurance

Background:

Accurate radiation dose delivery is critical in helical tomotherapy.
Patient-specific quality assurance (QA) is essential for verifying treatment plans.
The TomoTherapy HI-ART II system requires robust QA protocols.

Purpose of the Study:

To evaluate the accuracy of patient-specific delivery quality assurance (DQA) plans for the TomoTherapy HI-ART II system.
To assess both absolute point dose agreement and spatial dose distribution accuracy.
To quantify variations in gamma index for different anatomical sites.

Main Methods:

Seventy-one patient-specific DQA plans were analyzed.
Measurements were performed using film and ion chamber dosimetry.
Spatial agreement was assessed using the gamma metric, with average frequency plotted against gamma intervals.
Analysis was stratified by treatment site (head and neck, prostate, pelvis-abdomen, other sites).

Main Results:

Absolute point dose agreement was within 1.19% (head and neck) to 2.14% (pelvis-abdomen).
The gamma metric analysis demonstrated good spatial agreement between calculated and measured dose distributions.
Quantification of gamma index variation provided site-specific insights into DQA plan accuracy.

Conclusions:

Patient-specific DQA plans for helical tomotherapy demonstrate high accuracy in absolute dose and spatial distribution.
The methods employed provide reliable verification of treatment plans across diverse anatomical locations.
These findings support the clinical implementation and validation of helical tomotherapy QA protocols.