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Dosimetry for irregular shaped fields of beta rays

S J Supe, S Datta

Physics in Medicine and Biology

|July 1, 1976

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This study presents a practical method for calculating radiation doses for non-circular fields used in beta-ray eye therapy. The dosimetry method accurately predicts surface and depth doses, improving treatment planning.

Area of Science:

Medical Physics
Radiation Oncology
Ophthalmology

Background:

Beta-ray eye applicators are used in treating ocular conditions.
Various field shapes and sizes of collimators are employed with these applicators.
Accurate dosimetry is crucial for effective and safe treatment planning.

Purpose of the Study:

To develop a method for calculating surface and depth doses for any shaped field used in beta-ray eye therapy.
To validate the proposed calculation method against experimental data.

Main Methods:

A dosimetry method was developed to calculate doses for non-circular fields based on data from circular fields.
The method utilizes a measured dose function representing dose rate at a specific depth for a circular field.

Related Experiment Videos

Calculated surface and depth doses were compared with experimental measurements for three non-circular fields.

Main Results:

The proposed method allows for the calculation of surface and depth doses for arbitrarily shaped fields.
Evaluated doses showed good agreement with experimentally obtained values for non-circular fields.
The findings demonstrate the practicability of the suggested dosimetry calculation method.

Conclusions:

The presented method provides a practical approach for dosimetry in beta-ray eye therapy, accommodating various field shapes.
This dosimetry technique can enhance the accuracy of treatment planning for ocular brachytherapy.
The study validates a computationally efficient method for determining radiation doses in complex applicator geometries.