Journal of Medical Physics
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Year : 1999  |  Volume : 24  |  Issue : 2  |  Page : 44-46

Variation In Electron Output And Percentage Depth Dose In Presence Of Lead Cutouts In Mevatron-74

Correspondence Address:
Lalit M Aggarwal

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Source of Support: None, Conflict of Interest: None

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Electrons are widely used for the treatment of superficial malignant tumours. Radiation field is modified by placing the lead or Cerrobend cutouts on the application. For electrons, variation in output is not systematic with the increase or decrease in field size. In this paper, we have evaluated the variation in electron output, percentage depth dose and dmax for smaller fields with lead cutouts. It is observed that the relations give by various authors for predicting outputs for irregular fields did not agree with our data and variation of more than + 10% was found. So, we conclude that it is prudent to measure individualised output for irregularly shaped electron fields for calculating the tumour dose.

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