Intensity distribution, modulation transfer function, and the effective dimension of a line‐focus x‐ray focal spot
作者:
Satish C. Prasad,
William R. Hendee,
Paul L. Carson,
期刊:
Medical Physics
(WILEY Available online 1998)
卷期:
Volume 3,
issue 4
页码: 217-223
ISSN:0094-2405
年代: 1998
DOI:10.1118/1.594238
出版商: American Association of Physicists in Medicine
数据来源: WILEY
摘要:
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.
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