Achieving 0.4-mm FWHM spatial resolution with an RPC-based small-animal PET prototype

P Martins,Alberto Blanco,Paulo Crespo,M Fatima Ferreira Marques,R F Marques,P M Gordo,M Kajetanowicz,G Korcyl, L B Lopes,J Michel,M Palka,M Traxler,P Fonte

Nuclear Science Symposium and Medical Imaging Conference（2013）

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摘要

We present experimental results obtained with a two-head prototype of a small-animal positron emission tomograph based on resistive plate chamber detectors (RPC-PET). A planar 22Na disk source was imaged. The maximum-likelihood expectation maximization (MLEM) reconstruction of the acquired data yielded a resolution of 0.4mm full width at half maximum (FWHM). Each of the two detectors utilized in this work had an effective front face of 6.4 cm × 6.4 cm and consisted of 5 gas gaps with a total thickness of 5 mm. The data included lines of response (LORs) inclined up to 58 °, demonstrating the parallax-free property of RPC-PET.

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关键词

data acquisition,expectation-maximisation algorithm,image reconstruction,image resolution,medical image processing,positron emission tomography,radioisotope imaging,radioisotopes,sodium,22na,fwhm spatial resolution,rpc-pet parallax-free property,rpc-based small-animal pet prototype,full width at half maximum,maximum-likelihood expectation maximization,planar sodium disk source,positron emission tomograph,resistive plate chamber detectors,size 5 mm,prototypes,detectors,spatial resolution

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