Hardcopy quality parameters to ensure structures detection at digital mammography


Autoria(s): Goto,Rafael Eidi; Pires,Silvio Ricardo; Medeiros,Regina Bitelli
Data(s)

01/06/2013

Resumo

Objective To develop procedures to ensure consistency of printing quality of digital images, by means of hardcopy quantitative analysis based on a standard image. Materials and Methods Characteristics of mammography DI-ML and general purpose DI-HL films were studied through the QC-Test utilizing different processing techniques in a FujiFilm®-DryPix4000 printer. A software was developed for sensitometric evaluation, generating a digital image including a gray scale and a bar pattern to evaluate contrast and spatial resolution. Results Mammography films showed maximum optical density of 4.11 and general purpose films, 3.22. The digital image was developed with a 33-step wedge scale and a high-contrast bar pattern (1 to 30 lp/cm) for spatial resolution evaluation. Conclusion Mammographic films presented higher values for maximum optical density and contrast resolution as compared with general purpose films. The utilized digital processing technique could only change the image pixels matrix values and did not affect the printing standard. The proposed digital image standard allows greater control of the relationship between pixels values and optical density obtained in the analysis of films quality and printing systems.

Formato

text/html

Identificador

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-39842013000300156

Idioma(s)

en

Publicador

Colégio Brasileiro de Radiologia e Diagnóstico por Imagem

Fonte

Radiologia Brasileira v.46 n.3 2013

Palavras-Chave #Hardcopy #Quality control #Contrast sensitivity #Mammography
Tipo

journal article