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Monte Carlo dose calculation on deforming anatomy.

Matthias Peterhans¹, Daniel Frei, Peter Manser

¹ARTORG Center for Computer-Aided Surgery CCAS, University of Bern, Stauffacherstrasse, Switzerland. Matthias.Peterhans@istb.unibe.ch

Zeitschrift Fur Medizinische Physik

|January 21, 2011

Summary

This study validates a new dose calculation method for deforming anatomy using particle transport. The validated approach accurately handles irregular voxel geometries in deforming anatomical objects.

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Area of Science:

Medical Physics
Computational Biology
Radiotherapy Physics

Background:

Accurate dose calculation is crucial for radiotherapy, especially with moving anatomical structures.
Existing methods may struggle with the complex geometries arising from anatomical deformation.
Deformable image registration and dose accumulation are key challenges in adaptive radiotherapy.

Purpose of the Study:

To implement and validate a novel dose calculation approach for deforming anatomical objects.
To ensure accurate particle transport simulation within irregularly shaped, deformed voxels.
To provide a reliable tool for dose calculation in scenarios involving anatomical changes.

Main Methods:

Deformation represented by deformation vector fields and resulting in deformed voxel grids.
Particle transport approximated using voxel surfaces represented by triangles within the Swiss Monte Carlo Plan framework.
Validation performed using computational phantoms with regular and irregular grids for direct comparison.
Separate validation of voxel geometry and density change effects.

Main Results:

The proposed method yields equivalent results to established dose calculation algorithms.
No statistically significant errors were introduced by the implementation for irregular voxel geometries.
The validation methodology effectively isolates and assesses the impact of deformation on dose calculation.
The implementation demonstrates robustness in handling deforming anatomy.

Conclusions:

The presented dose calculation approach for deforming anatomy is successfully implemented and validated.
The method accurately accounts for irregular voxel geometries and density changes due to deformation.
This validated tool enables further research into dose calculation for dynamic anatomical scenarios.
The findings support the use of this method in adaptive radiotherapy planning and delivery.