Abstract
AbstractThis manuscript discusses the comparison of 19 clinically used irregular fields shaped by customized Cerrobend® blocks and by a Varian Millennium 80-leaf multileaf collimator using a Clarkson Sector Integration computer program developed using National Instruments LabVIEWTM 7.0. The comparison was made based on: (1) the calculated equivalent square fields, (2) the in-phantom output measurements of the fields shaped by customized Cerrobend® blocks and by a Varian Millennium 80 MLC, and (3) the in-phantom output measurements of block-shaped and MLC-shaped irregular fields and the outputs of the equivalent square fields at depths: dmax, d5, and the clinically prescribed depths (d c ). The calculated equivalent square fields’ side lengths, and in-phantom output measurements of block-shaped and MLC fields are comparable to each other. The displacement errors in block-shaped fields are relatively greater compared to MLC fields. Consistent with related studies, both field shaping methods have distinct geometric inaccuracies and limitations.KeywordsField shapingClarkson Sector Integration methodmultileaf collimatorcustomized blocks
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