Effect of scatter on reconstructed image quality in cone beam computed tomography: evaluation of a scatter-reduction optimisation function.
Radiat Prot Dosimetry
; 114(1-3): 337-40, 2005.
Article
em En
| MEDLINE
| ID: mdl-15933133
ABSTRACT
The effect of scatter on reconstructed image quality in cone beam computed tomography was investigated and a function which can be used in scatter-reduction optimisation tasks was tested. Projections were calculated using the Monte Carlo method in an axially symmetric cone beam geometry consisting of a point source, water phantom and a single row of detector elements. Image reconstruction was performed using the filtered backprojection method. Image quality was assessed by the L2-norm-based difference relative to a reference image derived from (1) weighted linear attenuation coefficients and (2) projections by primary photons. It was found that the former function was strongly affected by the beam hardening artefact and did not properly reflect the amount of scatter but the latter function increased with increasing beam width, was higher for the larger phantom and exhibited properties which made it a good candidate for scatter-reduction optimisation tasks using polyenergetic beams.
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Base de dados:
MEDLINE
Assunto principal:
Espalhamento de Radiação
/
Processamento de Imagem Assistida por Computador
/
Interpretação de Imagem Radiográfica Assistida por Computador
/
Tomografia Computadorizada por Raios X
Tipo de estudo:
Health_economic_evaluation
/
Risk_factors_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article