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Set-up error validation with EPID images: Measurements vs Egs_cbct simulation.

D van Eeden¹, F H J O'Reilly¹, F C P du Plessis¹

¹Medical Physics Department, Faculty of Health Sciences, University of the Free State, P.O. Box 339, Bloemfontein, 9300 South Africa.

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|November 5, 2019

Summary

This summary is machine-generated.

This study shows that fewer projection images are needed for accurate head and neck cancer patient setup verification using egs_cbct simulations. The egs_cbct code effectively replicates electronic portal imaging device (EPID) data for quality assurance.

Keywords:

Cone-beam CT EPID Image acquisition interval Monte Carlo egs_cbct

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Area of Science:

Medical Physics
Radiotherapy Imaging

Background:

Head and neck (H&N) cancer treatment requires precise patient positioning.
Electronic Portal Imaging Devices (EPIDs) capture projection images for setup verification during radiotherapy.

Purpose of the Study:

To evaluate the egs_cbct code's capability to simulate an EPID for H&N setup verification.
To determine the minimum number of projection images required for accurate CBCT reconstruction.

Main Methods:

Simulated projection images using the egs_cbct Monte Carlo code.
Reconstructed Cone-Beam Computed Tomography (CBCT) images from measured and simulated data.
Assessed image quality using the image acquisition interval (IAI) metric.

Main Results:

Phantom shifts determined within 2 mm and rotations within 1 degree using 20 projection images (IAI = 10 degrees).
Simulated data yielded comparable results to measured data.
Bony landmarks and air cavities were visible in reconstructed images.

Conclusions:

Head and neck setup verification is feasible with significantly fewer projection images.
The egs_cbct code serves as a valuable tool for investigating setup errors, reducing the need for extensive EPID measurements.