Image quality of digital direct flat-panel mammography versus an analog screen-film technique using a phantom model.
AJR Am J Roentgenol
; 188(2): 399-407, 2007 Feb.
Article
em En
| MEDLINE
| ID: mdl-17242248
ABSTRACT
OBJECTIVE:
The objective of our study was to compare the detection and distinguishability of microcalcifications on mammograms obtained with a digital direct flat-panel detector versus an analog system using an anthropomorphic breast phantom. MATERIALS ANDMETHODS:
Studies were performed with a digital mammography system (Selenia) and an analog mammography system (Mammomat 3). Sixty-five transparent films were used as test specimens. Randomly distributed round and heterogeneous silicate particles (diameter, 100-1,400 microm) and an anthropomorphic scatter body were applied to the films. All radiographs were taken at identical settings and exposures. Six radiologists rated the films and monitor-displayed images independently of each other in random order on a standardized electronic questionnaire.RESULTS:
Interpretations based on monitor reading produced superior results over those based on digital image reading and analog film reading. In 41.1% (95% CI, 38.7-43.5%) of all the monitor readings, 20.2% (18.2-22.2%) of all digital images, and 19.6% (17.6-21.6%) of all analog films, the number of detectable microcalcifications agreed with the gold standard method. The diameter of visible microcalcifications was interpreted correctly in 35.6% (33.2-38.0%) of monitor readings, 19.0% (17.1-21.0%) of digital images, and 21.0% (18.9-23.0%) of analog films; and microcalcification shape was interpreted correctly in 53.8% (51.4-56.3%) of monitor readings, 28.2% (26.0-30.4%) of digital images, and 28.3% (26.0-30.5%) of analog films. Microcalcification number and size were underestimated more frequently than overestimated. Regardless of display medium, accuracy increased proportionately with the diameter of the simulated microcalcifications for all evaluation variables.CONCLUSION:
Digital flat-panel mammography is superior to the analog screen-film method for the detection and morphologic characterization of microcalcifications larger than 200 microm in diameter when the display medium is a monitor.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ecrans Intensificadores para Raios X
/
Neoplasias da Mama
/
Apresentação de Dados
/
Mamografia
/
Intensificação de Imagem Radiográfica
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
/
Prognostic_studies
Limite:
Female
/
Humans
Idioma:
En
Revista:
AJR Am J Roentgenol
Ano de publicação:
2007
Tipo de documento:
Article