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Titolo:
Characterization of the reciprocity law failure in three mammography screen-film systems
Autore:
de Almeida, A; Sobol, WT; Barnes, GT;
Indirizzi:
Univto,o Paulo, Fac Filosofia Ciencias & Letras Ribeirao Pret, Ribeirao Pre Univ Sao Paulo Ribeirao Preto SP Brazil tras Ribeirao Pret, Ribeirao Pre Univ Alabama Hosp & Clin, Dept Radiol, Birmingham, AL 35233 USA Univ Alabama Hosp & Clin Birmingham AL USA 35233 Birmingham, AL 35233 USA
Titolo Testata:
MEDICAL PHYSICS
fascicolo: 5, volume: 26, anno: 1999,
pagine: 682 - 688
SICI:
0094-2405(199905)26:5<682:COTRLF>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Keywords:
breast radiography; mammography; screen-film system; reciprocity law failure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: de Almeida, A Univroao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Pret, Campus Ribei Univ Sao Paulo Campus Ribeiro Preto Ribeirao Preto SP Brazil
Citazione:
A. de Almeida et al., "Characterization of the reciprocity law failure in three mammography screen-film systems", MED PHYS, 26(5), 1999, pp. 682-688

Abstract

The purpose of this project was to quantify reciprocity law failure (RLF) for mammography screen-film systems. Three widely used screen-film systems were evaluated: the Kodak MinR 2000 system, Fuji UM Mammo Fine screen and Fuji UM MA HC film, and Agfa MR Detail screen and Agfa Mammoray MR5 film. The legit algorithm that Linearizes logistic curve shapes was utilized to characterize film sensitometric response. Different values of mammographic phantom thickness, tube current, and kVp were used to vary screen-film exposure rates. RLF was quantified by examining the dependence of legit parameters(maximum and minimum film density, curve shift, and slope) on exposure rate. The shift of the legit curve was found to be a good indicator of the screen-film system speed, while the slope of the legit curve is affected by the RLF. RLF leads to changes in film contrast as well as speed. For the range of exposure rates measured (50-fold), screen-film contrast and speed varied by factors of 2 and 3.5, respectively. Film contrast decreased as exposure rate increased. The greatest changes were observed with the Kodak MinR 2000 screen-film system. (C) 1999 American Association of Physicists in Medicine. [S0094-2405(99)01905-7].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 10:16:32