Enhanced reconstruction for PET scanner with a narrow field of view using backprojection method (CROSBI ID 709351)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Matulić, Tomislav ; Bagarić, Robert ; Seršić, Damir
engleski
Enhanced reconstruction for PET scanner with a narrow field of view using backprojection method
There are several reconstruction methods for positron emission tomography (PET), but iterative methods based on maximum likelihood estimation are primarily used. In this paper, we propose a 2D reconstruction method for PET scanners that have a narrow field of view (FoV) in the tangential direction and are based on the backprojection (BP) method. If a PET scanner has a reduced field of view in the tangential direction, the reconstructed image obtained by 2D BP or 2D filtered backprojection produces significant distortions. We used the Raytest ClearPET TM scanner to obtain measurements. The ClearPET scanner consists of a maximum of 20 detector cassettes arranged in a ring configuration. The used ClearPET scanner contains only eight detector cassettes. By knowing the geometry of the ClearPET scanner, we determined a necessary compensation to reduce the undesirable effects caused by the narrow field of view. We simulated the response of all allowed coincidences located on the observed axial intersection of the ClearPET scanner, which we used to obtain an image for compensation. Because of finite dimension of a single crystal in the ClearPET scanner, we also added dithering to the measured and simulated data to minimize the quantization effect resulting from the reconstruction method. Ultimately, the image obtained by proposed compensation was significantly improved compared to the (filtered) backprojection method. Unlike iterative reconstruction methods, the proposed method is faster, but the resulting images show the object captured by the ClearPET scanner less accurately. The proposed method can be implemented as an initial condition in 2D reconstruction using an iterative method to accelerate convergence.
backprojection ; filtered backprojection ; Raytest ClearPET TM scanner ; dithering ; narrow field of view
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Podaci o prilogu
346-351.
2021.
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objavljeno
10.23919/MIPRO52101.2021.9596922
Podaci o matičnoj publikaciji
44th International Convention on Information, Communication and Electronic Technology (MIPRO): Proceedings of the International Convention MIPRO
Institute of Electrical and Electronics Engineers (IEEE)
2623-8764
Podaci o skupu
MIPRO 2021
predavanje
27.09.2021-01.10.2021
Opatija, Hrvatska