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An attenuated projector-backprojector for iterative SPECT reconstruction

Gullberg, G T ; Huesman, R H ; Malko, J A ; Pelc, N J ; Budinger, T F

Physics in medicine & biology, 1985-08, Vol.30 (8), p.799-816 [Periódico revisado por pares]

Bristol: IOP Publishing

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Título:
An attenuated projector-backprojector for iterative SPECT reconstruction
Autor: Gullberg, G T ; Huesman, R H ; Malko, J A ; Pelc, N J ; Budinger, T F
Assuntos: Biological and medical sciences ; Heart - diagnostic imaging ; Humans ; Investigative techniques, diagnostic techniques (general aspects) ; Liver - diagnostic imaging ; Lung - diagnostic imaging ; Medical sciences ; Models, Anatomic ; Radionuclide investigations ; Software ; Spleen - diagnostic imaging ; Tomography, X-Ray Computed - instrumentation ; Tomography, X-Ray Computed - methods
É parte de: Physics in medicine & biology, 1985-08, Vol.30 (8), p.799-816
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Descrição: A new ray-driven projector-backprojector which can easily be adapted for hardware implementation is described and simulated in software. The projector-backprojector discretely models the attenuated Radon transform of a source distributed within an attenuating medium as line integrals of discrete pixels, obtained using the standard sampling technique of averaging the emission source or attenuation distribution over small square regions. Attenuation factors are calculated for each pixel during the projection and backprojection operations instead of using precalculated values. The calculation of the factors requires a specification of the attenuation distribution, estimated either from an assumed constant distribution and an approximate body outline or from transmission measurements. The distribution of attenuation coefficients is stored in memory for efficient access during the projection and backprojection operations. The reconstruction of the source distribution is obtained by using a conjugate gradient or SIRT type iterative algorithm which requires one projection and one backprojection operation for each iteration.
Editor: Bristol: IOP Publishing
Idioma: Inglês

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An attenuated projector-backprojector for iterative SPECT reconstruction

Gullberg, G T ; Huesman, R H ; Malko, J A ; Pelc, N J ; Budinger, T F

Bristol: IOP Publishing

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