A simple calculation method for determination of equivalent square field.

Journal of Medical Physics
Seyed Ali ShafieiSeyed Ahmad Shafiei

Abstract

Determination of the equivalent square fields for rectangular and shielded fields is of great importance in radiotherapy centers and treatment planning software. This is accomplished using standard tables and empirical formulas. The goal of this paper is to present a formula based on analysis of scatter reduction due to inverse square law to obtain equivalent field. Tables are published by different agencies such as ICRU (International Commission on Radiation Units and measurements), which are based on experimental data; but there exist mathematical formulas that yield the equivalent square field of an irregular rectangular field which are used extensively in computation techniques for dose determination. These processes lead to some complicated and time-consuming formulas for which the current study was designed. In this work, considering the portion of scattered radiation in absorbed dose at a point of measurement, a numerical formula was obtained based on which a simple formula was developed to calculate equivalent square field. Using polar coordinate and inverse square law will lead to a simple formula for calculation of equivalent field. The presented method is an analytical approach based on which one can estimate the equ...Continue Reading

References

Jun 1, 1997·The British Journal of Radiology·P LombardiR Calandrino
May 8, 1999·Physics in Medicine and Biology·Y XiaoJ Reiff
Jan 1, 2000·Physics in Medicine and Biology·B M McCurdy, S Pistorius
Oct 28, 2004·The British Journal of Radiology·G S J Tudor, S J Thomas
Oct 23, 2008·The British Journal of Radiology·S J ThomasN I Twyman

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