Lag and ghosting in a clinical flat-panel selenium digital mammography system.
Med Phys
; 33(8): 2998-3005, 2006 Aug.
Article
em En
| MEDLINE
| ID: mdl-16964878
ABSTRACT
We present measurements of lag and ghosting in a FDA-approved digital mammography system that uses a dielectric/selenium based detector structure. Lag is the carryover of signal from a previous image, whereas ghosting is the reduction of sensitivity caused by previous exposure history of the detector. Data from six selenium units were acquired. For the type of selenium detector tested, and under typical clinical usage conditions, the lag was as high as 0.15% of source signal and the ghosting could be as high as 15%. The amount of lag and ghosting varied from unit to unit. Results were compared with data acquired on a phosphor-based full-field digital mammography system. Modifications in the technology of the selenium detectors appear to have resulted in a marked decrease in both lag and ghosting effects in more recent systems.
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Base de dados:
MEDLINE
Assunto principal:
Selênio
/
Ecrans Intensificadores para Raios X
/
Processamento de Sinais Assistido por Computador
/
Mamografia
/
Intensificação de Imagem Radiográfica
/
Artefatos
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article