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An algorithm for detection of couch-beam intersection.

Andrew H Buckle¹

¹Regional Medical Physics Department, Northern Centre for Cancer Treatment, Newcastle General Hospital, Newcastle-upon-Tyne, United Kingdom. andrew.buckle@nuth.nhs.uk

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists

|June 1, 2005

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This study introduces a graphical method to prevent radiation beam blocking by couch supports during medical treatments. The technique simplifies couch geometry and uses matrix operations for accurate beam projection, enhancing treatment planning.

Area of Science:

Medical physics
Radiation oncology
Computational geometry

Background:

Radiation therapy requires precise beam delivery.
Couch supports can obstruct radiation beams, compromising treatment efficacy.
Accurate beam path planning is crucial for patient safety and treatment success.

Purpose of the Study:

To develop a graphical method for avoiding beam blocking by couch supports.
To implement and test a software algorithm for this purpose.
To assess the application of this technique in 3D treatment planning.

Main Methods:

Simplification of the couch cross-section geometry.
Utilizing matrix operations for beam projection.
Developing and testing a software implementation of the algorithm.

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Main Results:

The graphical method effectively projects the radiation beam into the plane normal to the couch's longitudinal axis.
Software testing confirmed the algorithm's functionality.
The method is applicable to 3D treatment planning.

Conclusions:

The described graphical method and software provide a viable solution for avoiding beam blocking by couch supports.
This technique can improve the accuracy and safety of radiation therapy planning.
Further application in 3D treatment planning is recommended.