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Intensity distribution, modulation transfer function, and the effective dimension of a line‐focus x‐ray focal spot
Author(s) -
Prasad Satish C.,
Hendee William R.,
Carson Paul L.
Publication year - 1976
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594238
Subject(s) - optics , optical transfer function , focus (optics) , dimension (graph theory) , physics , distribution (mathematics) , intensity (physics) , line (geometry) , transfer function , function (biology) , mathematics , geometry , mathematical analysis , engineering , electrical engineering , evolutionary biology , pure mathematics , biology
The radiant intensity along the anode–cathode dimension of a line‐focus x‐ray focal spot tends to peak at the center and decrease gradually to zero at the edges. In recognition of this varying intensity, the ICRU has recommended that the anode–cathode dimension of the focal spot be reported as 0.7 times the dimension measured with a pinhole camera. In this paper more objective correction factors are developed. These correction factors are based upon comparison of calculated MTFs of focal spots with Gaussian and cosine intensity distributions with the MTF for focal spots with a uniform intensity distribution.