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Image Noise Analysis of a Large Ring PET Scanner

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Document pages: 8 pages

Abstract: Imagenoise analysis of a large ring PET scanner “macro PET” performed using twodifferent phantoms, namely a Jaszczak SPECT phantom and a uniform cylindricalphantom. In the present work, simple 2D filtered back projection was used toreconstruct all the images, and in almost all the cases a Hamming filter ofcutoff frequency 0.4 and a 256 by 256 matrix with zoom factors from 1 to 4 wereused in order to investigate the imaging capabilities of the new scanner andthe influence of filter and cut-off frequency on the filtered back projectedimages. Results indicate that 11.1 mm cold rod in the Jaszczak phantom imagescan consistently be seen. The Coefficient of variation (CV) results for Hannand Hamming filters are very similar and increase approximately in linearfashion with higher cutoff frequency. The value of CV for the Parsen filter islower than the value for Hann and Hamming filters. It concludes that allfilters with low cut off-frequency (0.6) would suppress image noisebut decrease contrast.

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