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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

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Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and

Sangroh Kim¹, Terry T Yoshizumi, Fang-Fang Yin

¹Department of Radiation Oncology, Scott & White Memorial Hospital, Temple, TX 76508, USA. sakim@sw.org

Physics in Medicine and Biology

|April 5, 2013

Summary

A new spiral CT phase-space source model was developed for the BEAMnrc/EGSnrc Monte Carlo system, enabling accurate dose estimation in spiral CT scans. This validated model improves spiral CT simulations and dose calculations.

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Area of Science:

Medical Physics
Computational Physics
Radiological Sciences

Background:

The BEAMnrc/EGSnrc Monte Carlo system lacks a dedicated spiral CT source model.
Accurate simulation of spiral CT requires a specialized source model to account for helical scanning geometry.

Purpose of the Study:

To develop and validate a spiral CT phase-space source model within the BEAMnrc/EGSnrc Monte Carlo system.
To enable accurate dose estimation for spiral CT examinations using Monte Carlo simulations.

Main Methods:

Implemented a spiral phase-space source model in the DOSXYZnrc user code, incorporating parameters like pitch and slice thickness.
Simulated spiral CT scans in a phantom using the new model and compared dose distributions with the original multi-direction source.
Validated simulations by comparing MC-derived surface-dose profiles with radiochromic film measurements from a patient CT protocol.

Main Results:

The new model accurately simulates spiral CT scanning in a single run.
Dose distributions generated by the new model were equivalent to the original multi-direction source.
Monte Carlo simulated surface profiles closely matched experimental film measurements (within 10%).

Conclusions:

The developed spiral CT phase-space source model is successfully implemented in BEAMnrc/EGSnrc.
This model provides a valuable tool for accurate dose estimation in spiral CT simulations.
The validated model enhances the utility of BEAMnrc/EGSnrc for clinical CT dosimetry.