TITLE:
Image Noise Analysis of a Large Ring PET Scanner
AUTHORS:
M. M. Ahasan, S. Akter, R. Khatun, M. F. Uddin, A. N. Monika, M. A. Rahman, M. N. Khanam
KEYWORDS:
PET, Sinogram, Filter & CV
JOURNAL NAME:
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology,
Vol.6 No.2,
May
26,
2017
ABSTRACT: Image
noise analysis of a large ring PET scanner “macro PET” performed using two
different phantoms, namely a Jaszczak SPECT phantom and a uniform cylindrical
phantom. In the present work, simple 2D filtered back projection was used to
reconstruct all the images, and in almost all the cases a Hamming filter of
cutoff frequency 0.4 and a 256 by 256 matrix with zoom factors from 1 to 4 were
used in order to investigate the imaging capabilities of the new scanner and
the influence of filter and cut-off frequency on the filtered back projected
images. Results indicate that 11.1 mm cold rod in the Jaszczak phantom images
can consistently be seen. The Coefficient of variation (CV) results for Hann
and Hamming filters are very similar and increase approximately in linear
fashion with higher cutoff frequency. The value of CV for the Parsen filter is
lower than the value for Hann and Hamming filters. It concludes that all
filters with low cut off-frequency (0.6) would suppress image noise
but decrease contrast.