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Quantification of motion unsharpness in digital fluoroscopy

Lookup NU author(s): Dr Colin Kotre


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The objectives of this work were first to develop a convenient method to quantify persistence in digital fluoroscopy systems, then to quantify the effect of variable temporal averaging on the detection of moving low-contrast test details within digital fluoroscopic and pulsed fluoroscopic images. The results were analysed to clarify the relationship between the optimum persistence required to see the lowest contrast for circular test details for a range of diameters and their speed of movement. The optimum persistence values obtained are compared with the limited data available on speeds of movement of patient organs during fluoroscopy. It is tentatively concluded that for imaging the abdomen, the optimum imaging system persistence time constant is similar to 0.15 s. For the much greater speeds associated with cardiac motion, no additional frame averaging is necessary, i.e. just the persistence provided by the observer's visual system appears to be optimal for small objects.

Publication metadata

Author(s): Kotre CJ, Marshall NW, Guibelalde E

Publication type: Article

Publication status: Published

Journal: Radiation Protection Dosimetry

Year: 2006

Volume: 117

Issue: 1-3

Pages: 304-308

ISSN (print): 0144-8420

ISSN (electronic): 1742-3406

Publisher: Oxford University Press


DOI: 10.1093/rpd/nci745


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