Semi-empirical depth dose distribution formula for 60Co γ-rays

Ravishankar, R; Sengupta, M; Bandyopadhyay, Tapas Kumar; Muthukrishnan, G.; Ghose, A.M.

doi:10.1016/0969-806x(94)90096-5

Radiation Physics and Chemistry

1994

DOI: 10.1016/0969-806x(94)90096-5

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Semi-empirical depth dose distribution formula for 60Co γ-rays

R Ravishankar

M Sengupta

Tapas Kumar Bandyopadhyay

et al.

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“…Here, a single formula can predict the off axis distributions covering the whole region. The method is based on the formula, developed for 60 Co therapy beam by Ravishankar[ 8 ] and we extended the same for the case of 4MV LINAC and other high-energy machines, thus demonstrating the versatility of the method.…”

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confidence: 81%

Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system

Pal

Ravishankar²,

Sharma³

et al. 2006

J Med Phys

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A mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of 60Co γ-rays and high energy X-rays. Investigations are considered upto a depth of 25 cm in the case of 4MV LINAC for which measurements were carried out in our laboratory using indigenously developed Radiation Field Analyzer. For 60Co γ-rays as well as 6 and 18MV LINAC beams we could get off-axis profiles only upto 20 cm. The shift δ between measured and predicted OAR is within ±2 mm except for 20 cm depth near the falling edge of the penumbra, where it is 2.80 mm. Software has been developed in Visual Basic 6 on Windows platform to plot Isodose curves, which is based on the mathematical modeling of OAR and central axis percentage depth dose.

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mentioning

confidence: 81%

Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system

Pal

Ravishankar²,

Sharma³

et al. 2006

J Med Phys

View full text Add to dashboard Cite

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Estimation of percentage depth dose distributions for therapeutic machines

Pal

Muthukrishnan

Ravishankar

et al. 2002

Radiation Physics and Chemistry

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Semi-empirical depth dose distribution formula for 60Co γ-rays

Cited by 2 publications

References 1 publication

Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system

Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system

Estimation of percentage depth dose distributions for therapeutic machines

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