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

Autor:	J Meyer, A G Haus, L B North
Rok vydání:	1980
Předmět:	Unsharpness business.industry Radiography Optical transfer function Humans Magnification Medicine Radiography Thoracic Radiology Nuclear Medicine and imaging business Nuclear medicine Lung
Zdroj:	Radiology. 137:197-202
ISSN:	1527-1315 0033-8419
DOI:	10.1148/radiology.137.1.7422845
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::649c3d4198c856a937244c967df73c72 https://doi.org/10.1148/radiology.137.1.7422845 Zobrazit plný text záznamu