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Relationship between tissue-phantom ratio and percentage depth dose
Medical Physics
|January 1, 1977
Abstract:
The relationship between the tissue-phantom ratio and central-axis percentage depth-dose data is derived. Relationships between the tissue-phantom ratio, tissue-maximum ratio, and tissue-air ratio are given. A simple model is developed which suggests that the degree to which the TPR and TMR are independent of distance from the source depends largely on the collimator/flattening-filter scatter.