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British Journal of Radiology (2004) 77, 672-674
© 2004 British Institute of Radiology
doi: 10.1259/bjr/89967913
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Implementation of a spreadsheet program for calculation of equivalent square field size

A W Seaby, BSc, MSc, M Thomas, BSc and S J S Ryde, MSc, PhD

Department of Medical Physics and Clinical Engineering, Singleton Hospital, Swansea NHS Trust, Swansea SA2 8QA, UK



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  		Figure 1. A family of Lamé curves characterized by different exponents.

 


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  		Figure 2. Monitor screen dump showing scroll-bars and graphical representation of an irregular field.

 


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  		Figure 3. A re-entrant field shape and the spreadsheet approximation. The rotated axes, shown as dashed lines, were used for the equivalent square program.

 




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