Sinogram-based attenuation correction in PET/CT.
J Xray Sci Technol
; 24(1): 9-22, 2016.
Article
en En
| MEDLINE
| ID: mdl-26890905
ABSTRACT
In a typical positron emission tomography/computed tomography (PET/CT) system, the attenuation correction is necessary for PET image reconstruction, which involves a transformation from the CT Hounsfield units (HU) to its linear attenuation coefficient (LAC) at 511âkeV. This transformation is usually aided by an empirical bilinear function, followed by the forward projection of the transformed attenuation image. In this paper, we propose a direct method that calculates attenuation factors from CT projections, without using a reconstructed CT image. In this method, the human body is considered as a mixture of three distinct components air, water and bone. Then, we estimate the proportions of these three components along each x-ray path and restore the attenuation factor at 511âkeV with the known water and bone LACs. Our numerical results show that the proposed method produces as accurate estimation as the conventional HU mapping method.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Procesamiento de Imagen Asistido por Computador
/
Tomografía Computarizada por Tomografía de Emisión de Positrones
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
J Xray Sci Technol
Asunto de la revista:
RADIOLOGIA
Año:
2016
Tipo del documento:
Article
País de afiliación:
Estados Unidos