Journal of Medical Physics
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Year : 1999  |  Volume : 24  |  Issue : 1  |  Page : 15-20

Determination Of Zero-Area Tissue-Maximum Ratio For 60Co, 6 And 10 MV Photon Beams

Correspondence Address:
H.K Malhotra

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Source of Support: None, Conflict of Interest: None

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Accurate determination of Zero-Area Tissue-Maxmimum Ratio (TMR) is a pre-requisite for using Scatter-Function dose computation model for estimating the dose in a phantom irradiated by photon beams. In the current study, zero-area TMRs have been experimentally determined by measuring the narrow beam attenuation curve in scatter free conditions for 60co, 6, and 10 MV photon beams. The measured zero-area TMR values were cross-verified by two independent procedures and were found to be in good agreement. These measurements along with the conventional measurements of TMRs allow an accurate determination of SMR values.

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