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Electronic scanning‐slit fluorography: Design and performance of a prototype unit
Author(s) -
Plenkovich Dinko,
Kruger Robert A.,
Sorenson James A.
Publication year - 1987
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 - 10.1118/1.596094
Subject(s) - slit , optics , unit (ring theory) , 3d scanning , medical physics , materials science , computer science , physics , artificial intelligence , mathematics , mathematics education
Electronic scanning‐slit fluorography involves replacing paired fore and aft slits for scatter rejection with only one beam‐defining tantalum fore aperture. Since the video signal within the projection of the aperture on the image intensifier is much more intense than behind the tantalum, one can discriminate electronically between these two signals and thus eliminate the unwanted x‐ray scatter and veiling glare. The general features of a prototype unit are described along with the rationale for the choice of design factors employed. Imaging time of 1–2 s has been achieved using multiple scanning slits. Small focal‐spot size and large number of pixels are favored for higher dose utilization, shorter imaging time, and lower x‐ray tube loading, as well as for better spatial resolution. Images of a chest phantom show better visibility of low‐contrast details, especially in poorly penetrated areas, when compared with the image obtained and displayed under the same conditions, but using a conventional grid to reject scattered radiation.