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Tytuł: System matrix computation for iterative reconstruction algorithms in spect based on direct measurements

Autor:

Borys, Damian ; Szczucka-Borys, Katarzyna ; Gorczewski, Kamil

Data wydania:

2011

Typ zasobu:

artykuł

Współtwórca:

Korbicz, Józef (1951- ) - red. ; Uciński, Dariusz - red.

Tytuł publikacji grupowej:

AMCS, Volume 21 (2011)

Abstract:

A method for system matrix calculation in the case of iterative reconstruction algorithms in SPECT was implemented and tested. Due to a complex mathematical description of the geometry of the detector set-up, we developed a method for system matrix computation that is based on direct measurements of the detector response. In this approach, the influence of the acquisition equipment on the image formation is measured directly. The objective was to obtain the best quality of reconstructed images with respect to specified measures. ; This is indispensable in order to be able to perform reliable quantitative analysis of SPECT images. It is also especially important in non-hybrid gamma cameras, where not all physical processes that disturb image acquisition can be easily corrected. Two experiments with an 131"I" point source placed at different distances from the detector plane were performed allowing the detector response to be acquired as a function of the point source distance. An analytical Gaussian function was fitted to the acquired data in both the one- and the two-dimensional case. ; A cylindrical phantom filled with a water solution of 131"I" containing a region of ?cold? spheres as well as a uniform solution (without any spheres) was used to perform algorithm evaluation. The reconstructed images obtained by using four different of methods system matrix computation were compared with those achieved using reconstruction software implemented in the gamma camera. The contrast of the spheres and uniformity were compared for each reconstruction result and also with the ranges of those values formulated by the AAPM (American Association of Physicists in Medicine). ; The results show that the implementation of the OSEM (Ordered Subsets Expectation Maximization) algorithm with a one-dimensional fit to the Gaussian CDR (Collimator-Detector Response) function provides the best results in terms of adopted measures. However, the fit of the two-dimensional function also gives satisfactory results. Furthermore, the CDR function has the potential to be applied to a fully 3D OSEM implementation. The lack of the CDR in system matrix calculation results in a very noisy image that cannot be used for diagnostic purposes.

Wydawca:

Zielona Góra: Uniwersytet Zielonogórski

Identyfikator zasobu:

oai:zbc.uz.zgora.pl:46908

DOI:

10.2478/v10006-011-0014-1

Strony:

193-202

Źródło:

AMCS, Volume 21, Number 1 (2011) ; kliknij tutaj, żeby przejść

Jezyk:

eng

Prawa do dysponowania publikacją:

Biblioteka Uniwersytetu Zielonogórskiego

Temat i słowa kluczowe:

SPECT iterative reconstruction quantitative imaging

Kolekcje, do których przypisany jest obiekt:

Data ostatniej modyfikacji:

2024-11-05

Data dodania obiektu:

2018-08-20

Liczba wyświetleń treści obiektu:

144

Wszystkie dostępne wersje tego obiektu:

https://zbc.uz.zgora.pl/repozytorium/publication/55006

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Nazwa wydania Data
System matrix computation for iterative reconstruction algorithms in spect based on direct measurements 2024-11-05

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Adres

Biblioteka Uniwersytetu Zielonogórskiego
al. Wojska Polskiego 71
65-762 Zielona Góra

Telefon

(+48) 68 328 21 55

E-Mail

repozytorium@uz.zgora.pl

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