Effects of geometric and screen-film unsharpness in conventional and 350-kVp chest radiography

Clinical comparison of 350- and conventional 120-kVp techniques indicates that small linear structures, such as small pulmonary blood vessels, are shown better at 120 kVp, due in part to two factors affecting image unsharpness: geometric and screen-film unsharpness. The combined effects of geometric...

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Bibliographic Details
Published inRadiology Vol. 137; no. 1 Pt 1; p. 197
Main Authors Haus, A G, Meyer, J, North, L B
Format Journal Article
LanguageEnglish
Published United States 01.10.1980
Subjects
Humans
Lung - diagnostic imaging
Radiography, Thoracic - instrumentation
Radiography, Thoracic - methods
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Summary:Clinical comparison of 350- and conventional 120-kVp techniques indicates that small linear structures, such as small pulmonary blood vessels, are shown better at 120 kVp, due in part to two factors affecting image unsharpness: geometric and screen-film unsharpness. The combined effects of geometric (Ug) and screen-film unsharpness were evaluated for both kVp levels. The total-system modulation transfer function (MTFUg X MTFscreen-film) demonstrates differences in unsharpness under two conditions: (a) when the same screen-film system is used with different magnifications (i.e., extreme planes in the chest) and (b) when different screen-film systems are used for magnification of the midplane of the chest.
ISSN:0033-8419
1527-1315
DOI:10.1148/radiology.137.1.7422845