Imaging of the human torso using cone-beam transmission CT implemented on a rotating gamma camera.
J Nucl Med
; 33(1): 150-6, 1992 Jan.
Article
en En
| MEDLINE
| ID: mdl-1730983
ABSTRACT
Radionuclide transmission CT generated on a rotating gamma camera can improve SPECT imaging by providing attenuation maps for attenuation compensation and for anatomical correlation. This paper demonstrates the feasibility and high quality of cone-beam transmission CT (CB-CT) of human subjects, in comparison to conventional parallel-ray CT, and evaluates some possible imaging protocols. Two CB-CT implementation modes, with a cone-beam collimator and without any collimator, were evaluated. Three human subjects of different dimensions were imaged. For the two smaller subjects, the CB-CT images were dramatically superior, in terms of noise and resolution, to those obtained with a parallel-ray geometry. The image noise was less by a factor of 6. CB-CT linear attenuation coefficients were found to be in close agreement with published values for various tissues. For the largest subject, image truncation produced a ring artifact at the edge, but inside the artifact, the image quality was still very good. Cone-beam images obtained without any collimator were acceptable, but photon scatter degraded the image contrast.
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Bases de datos:
MEDLINE
Asunto principal:
Tórax
/
Tomografía Computarizada por Rayos X
/
Tomografía Computarizada de Emisión de Fotón Único
/
Hígado
Límite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Nucl Med
Año:
1992
Tipo del documento:
Article