Naslov
Enhanced reconstruction for PET scanner with a narrow field of view using backprojection method

Autori
Matulić, Tomislav ; Bagarić, Robert ; Seršić, Damir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
44th International Convention on Information, Communication and Electronic Technology (MIPRO): Proceedings of the International Convention MIPRO / - : Institute of Electrical and Electronics Engineers (IEEE), 2021, 346-351

Skup
44th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO 2021)

Mjesto i datum
Opatija, Hrvatska, 27.09.2021. - 01.10.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
backprojection ; filtered backprojection ; Raytest ClearPET TM scanner ; dithering ; narrow field of view

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Računarstvo

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