Application of European protocol in the evaluation of contrast-to-noise ratio and mean glandular dose for two digital mammography systems.
Radiat Prot Dosimetry
; 129(1-3): 231-6, 2008.
Article
en En
| MEDLINE
| ID: mdl-18283065
The performance of two digital mammography systems, Agfa CR75 and CRMM3 computed radiography (CR) and IMS Giotto MD direct digital radiography (DR), was assessed by applying a method recommended in the European protocol for quality control in mammography screening. The contrast-to-noise ratio (CNR) and mean glandular dose (MGD) values were measured and contrast detail (CD) analysis was performed. The CNRs for system CR were 21.9, 12.9, 9.5, 8.8, 7.4, 5.5 and 4.4 for 2, 3, 4, 4.5, 5, 6 and 7-cm polymenthylmethacrylate (PMMA) thickness, respectively. The respective CNRs for system DR were 10.4, 8.8, 6.3, 7.3, 7.2, 6.4 and 6.54. For the same phantom thickness sequence, the MGDs were 0.7, 1.1, 1.3, 1.6, 1.9, 2.5 and 3.4 mGy for system CR, whereas they were 0.7, 1.2, 1.1, 1.3, 1.8, 3.5 and 3.9 mGy for system DR. The CNR and MGD results satisfactorily correlate with CD analysis results. The MGD values compare well with the values recommended in the European protocol. Despite being simple, CNR and MGD can provide an effective system for performance assessment and constancy checks for related optimisations.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Mama
/
Diagnóstico por Imagen
/
Mamografía
/
Intensificación de Imagen Radiográfica
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
Límite:
Female
/
Humans
País/Región como asunto:
Europa
Idioma:
En
Revista:
Radiat Prot Dosimetry
Año:
2008
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Reino Unido