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Fourier optics: toward a unified approach to performance evaluation of diagnostic X-ray focal spots

R F Wagner, K E Weaver and E W Denny

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ABSTRACT

When the component to be analysed has significant two-dimensional information content the complete two-dimensional transform can be presented pictorially, exploiting the Fourier transforming capability of a converging lens in a coherent optical system. Methods were discussed of making pin-hole camera transparencies of focal spots whose transmission of laser light is proportional to original X-ray intensity, and two-dimensional Fourier transforms obtained immediately from them in the focal plane of the converging lens were shown. Results obtained optically were compared with those obtained from microdensitometer scans of the pin-hole radiograph of the focal spot and the application of Fast Fourier digital techniques. Intensity distributions over various focal spots and the distributions of their transforms were also presented in computer generated three dimensional format.


Dates

Issue 2 ( 1 March 1974)



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