Computer-assisted scan protocol and reconstruction (CASPAR)-reduction of image noise and patient dose.
IEEE Trans Med Imaging
; 29(3): 724-32, 2010 Mar.
Article
em En
| MEDLINE
| ID: mdl-20199910
ABSTRACT
X-ray computed tomography is a powerful medical imaging device. It allows high-resolution 3-D visualization of the human body. However, one drawback is the health risk associated with ionizing radiation. Simply downscaling the radiation intensities over the entire scan results in increased quantum noise. This paper proposes the concept of computer-assisted scan protocol and reconstruction. More specifically, we propose a method to compute patient and task-specific intensity profiles that achieve an optimal tradeoff between radiation dose and image quality. Therefore, reasonable image variance and dose metrics are derived. Conventional third-generation systems as well as inverted geometry concepts are considered. Two dose/noise minimization problems are formulated and solved by an efficient algorithm providing optimized milliampere (mA)-profiles. Thorax phantom simulations demonstrate the promising advantage of this technique in this particular example, the dose is reduced by 53% for third-generation systems and by 86% for an inverted geometry in comparison to a sinusoidal mA-profile at a constant upper noise limit.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Processamento de Imagem Assistida por Computador
/
Radiografia Torácica
/
Tomografia Computadorizada por Raios X
Tipo de estudo:
Health_economic_evaluation
Limite:
Female
/
Humans
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article