Evaluation Of Focal Spot Distribution By Rms Value And Its Effect On Blood Vessel Imaging In Angiography

Kunio Doi; Kurt Rossmann

doi:10.1117/12.954054

1 February 1975 Evaluation Of Focal Spot Distribution By Rms Value And Its Effect On Blood Vessel Imaging In Angiography

Kunio Doi, Kurt Rossmann

Author Affiliations +

Proceedings Volume 0047, Application of Optical Instrumentation in Medicine III; (1975) https://doi.org/10.1117/12.954054
Event: Application of Optical Instrumentation in Medicine III, 1974, Kansas City, United States

Abstract

It is well known that the x-ray intensity distribution of the focal spot can significantly affect radio-logic images, for example, blood vessel images in angiography (Refs.1, 2). For an accurate evaluation of the effect of this distribution on vessel images, it is essential to use the line spread function (LSF), the point spread function (PSF), or the optical transfer function (OTF) of the focal spot. However, for many years it has been common practice to describe the focal spot by its size, which is looked upon as a single figure of merit for the x-ray intensity distribution of the focal spot. Two methods are relatively well known; one is to measure the pinhole image size by a subjective judgment (Ref.3), and the other is to use the first-zero spatial frequency of the OTF for the determination of an equivalent uniform LSF (Ref.4).

Citation Download Citation

Kunio Doi and Kurt Rossmann "Evaluation Of Focal Spot Distribution By Rms Value And Its Effect On Blood Vessel Imaging In Angiography", Proc. SPIE 0047, Application of Optical Instrumentation in Medicine III, (1 February 1975); https://doi.org/10.1117/12.954054

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