Area beam equalization: optimization and performance of an automated prototype system for chest radiography.
Acad Radiol
; 11(4): 377-89, 2004 Apr.
Article
em En
| MEDLINE
| ID: mdl-15109010
ABSTRACT
RATIONALE AND OBJECTIVES:
To evaluate the feasibility and performance of an x-ray beam equalization system for chest radiography using anthropomorphic phantoms. MATERIALS ANDMETHODS:
Area beam equalization involves the process of the initial unequalized image acquisition, attenuator thickness calculation, mask generation using a 16 x 16 piston array, and final equalized image acquisition. Chest radiographs of three different anthropomorphic phantoms were acquired with no beam equalization and equalization levels of 4.8, 11.3, and 21. Six radiologists evaluated the images by scoring them from 1-5 using 13 different criteria. The dose was calculated using the known attenuator material thickness and the mAs of the x-ray tube.RESULTS:
The visibility of anatomic structures in the under-penetrated regions of the chest radiographs was shown to be significantly (P < .01) improved after beam equalization. An equalization level of 4.8 provided most of the improvements with moderate increases in patient dose and tube loading. Higher levels of beam equalization did not show much improvement in the visibility of anatomic structures in the under-penetrated regions.CONCLUSION:
A moderate level of x-ray beam equalization in chest radiography is superior to both conventional radiographs and radiographs with high levels of beam equalization. X-ray beam equalization can significantly improve the visibility of anatomic structures in the under-penetrated regions while maintaining good image quality in the lung region.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Radiografia Torácica
/
Intensificação de Imagem Radiográfica
Limite:
Humans
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article