title: Relationship between tissue-phantom ratio and percentage depth dose.
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.
mesh_terms: D000388:Air; D005374:Filtration; D008962:Models, Theoretical; D055585:Physical Phenomena; D010825:Physics; D011829:Radiation Dosage; D011859:Radiography / Q000295:instrumentation; D014965:X-Rays