TITLE:
The influence of filters on the SPECT image of Carlson phantom
AUTHORS:
Alireza Sadremomtaz, Payvand Taherparvar
KEYWORDS:
SPECT; Carlson Phantom; Filter; Cut-Off Frequency
JOURNAL NAME:
Journal of Biomedical Science and Engineering,
Vol.6 No.3,
March
28,
2013
ABSTRACT: Filter backprojection is an
important method of image reconstruction technique in clinical nuclear medicine
imaging. Because of noisy images due to less available photon statistics and
different factors associated with imaging system in nuclear medicine tomography,
using optimal filter to suppress the noise with keeping the proper signal is
one of the significant steps in image reconstruction strategy for clinical use.
In this paper, we present the effect of implementation of different filters on
the hot region of Carlson phantom SPECT image in reconstruction process. By defining some criteria such as image smoothness and contrast, estimation of spatial
resolution and location of hot cylindrical sources and their detectability the
best filter with specified parameter have been determined and the results
have been interpreted. Results show that the perceived image quality of hot
region and also their detectability has been improved when Shepp-Logan and
Ram-Lak filters with cut-off frequency of 0.4 has been used.