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A pencil-beam photon dose algorithm for stereotactic radiosurgery using a miniature multileaf collimator

L Dong¹, A Shiu, S Tung

¹Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA. dong@bethe.mdacc.tmc.edu

Medical Physics

|July 3, 1998

Summary

A new dose calculation model for miniature multileaf collimators (MMLC) in stereotactic radiosurgery offers high accuracy and efficiency. This advanced algorithm significantly speeds up dose computation for precise radiation delivery.

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Area of Science:

Medical Physics
Radiation Oncology
Computational Dosimetry

Background:

Stereotactic radiosurgery (SRS) demands precise radiation delivery.
Miniature multileaf collimators (MMLCs) are advanced beam-shaping devices for SRS.
Accurate and efficient dose calculation is crucial for MMLC-based SRS.

Purpose of the Study:

To develop an accurate and efficient dose calculation model for a computer-controlled MMLC.
To validate the model's performance against measured data for SRS applications.

Main Methods:

Developed a pencil-beam based algorithm using a sum of three Gaussian kernels.
Modeled MMLC fields by summing dose contributions from rectangular apertures and transmission blocks.
Utilized an effective rectangular field and equivalent square method for depth dose and output factor calculations.

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Main Results:

Calculated percentage depth dose within 1% of measured data.
Output factors accurate to within 1.5% of measured data.
Off-axis ratio calculations accurate to within 1.5% or 1 mm.

Conclusions:

The developed dose calculation model is accurate and efficient for MMLC-based SRS.
The algorithm demonstrates significant speed improvements over traditional methods.
This model facilitates precise and rapid dose computation in advanced radiation therapy.