The magnitude of treatment field set-up parameter correction in radiation therapy

To achieve a better correction effect in radiation treatment, a correction ( c α ) is suggested which is optimal in the sense of minimal standard deviation of the residual systematic displacement ( Δ r) obtained after correction. To evaluate the improvement due to c α , the performance of the origin...

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Bibliographic Details
Published in:Radiotherapy and oncology 1998-07, Vol.48 (1), p.79-82
Main Author: Gluhchev, Georgi
Format: Article
Language:English
Subjects:
Decision rule
Humans
Models, Theoretical
Radiation therapy
Radiotherapy Planning, Computer-Assisted
Random error
Systematic displacement
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Summary:To achieve a better correction effect in radiation treatment, a correction ( c α ) is suggested which is optimal in the sense of minimal standard deviation of the residual systematic displacement ( Δ r) obtained after correction. To evaluate the improvement due to c α , the performance of the original Bel's rule [2]was compared to the performance of its modification, where same decision-making thresholds were used but a correction c α was applied. For this, 5000 treatment courses were simulated at different standard deviations ( σ Δ and σ δ ) of the systematic displacement Δ and random error δ. The experiments showed improved accuracy by up to 7% in terms of | Δ r|≤1.5 mm and also a reduced average number of corrections per patient of about 0.1 corrections.
ISSN:0167-8140
1879-0887
DOI:10.1016/S0167-8140(98)00055-3