Abstract：
:Empirical functions that describe primary beam profiles for radiotherapy treatment planning systems generally account for finite source size only on beams unmodified by blocks, wedges, or compensating filters. To incorporate the effects of extended sources on such modified beams and to treat the effect of an extended source consistent with the manner in which the unmodified beam is treated, the unmodified beam profile can be written as a convolution of an unknown source function with a collimator transmission profile. Using Fourier transforms, one can then solve for the source function. This source function is then convolved with a beam transmission function that has been modified by blocks, wedges, or compensating filters to obtain a primary beam profile. A number of examples are presented that demonstrate the calculations of the effects of beam modifiers on primary beam profiles.
journal_name
Med Physjournal_title
Medical physicsauthors
Starkschall Gdoi
10.1118/1.596222subject
Has Abstractpub_date
1988-09-01 00:00:00pages
657-61issue
5eissn
0094-2405issn
2473-4209journal_volume
15pub_type
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