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- W2019353228 abstract "The author discusses relationship of exposure time to sharpness of x-ray shadow and arrest of movement for radiography of the chest. He uses a new criterion of sharpness, namely, the visibility of the small pulmonary vessels (idealized). He gives relationship between permissible loadings on the focal spot to the degree of sharpness attainable. Unsharpness varies inversely with the cube root of tube loading (ma. per mm.2 apparent focal spot). X-ray tubes with stationary anode are incapable of resolving 0.5 mm. pulmonary vessels set 0.25 mm. apart and moving 5 mm. per second. With present apparatus the best arrest of lung detail moving 5 mm. per second is with 1 mm. focal spot on a rotating anode, 1∕40 sec., 200 ma. at 1 meter distance. To use 2 mm. focal spot, 500 ma., at 2 meters is almost as good, and might be preferred on account of better detail in bones and lesser magnification of heart shadow." @default.
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- W2019353228 date "1938-04-01" @default.
- W2019353228 modified "2023-10-14" @default.
- W2019353228 title "Sharpness of Shadows in Radiography of the Lungs" @default.
- W2019353228 doi "https://doi.org/10.1148/30.4.493" @default.
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