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.
Highlights
Single Photon Emission Computed Tomography (SPECT) imaging is widely used in clinical nuclear medicine because of its beneficial role in diagnosis and management of diseases such as lymphoma cancer [1,2]
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
We present the effect of implementation of different filters on the hot region of Carlson phantom SPECT image in reconstruction process
Summary
Single Photon Emission Computed Tomography (SPECT) imaging is widely used in clinical nuclear medicine because of its beneficial role in diagnosis and management of diseases such as lymphoma cancer [1,2] Different factors such as; statistical nature of radioactive decay, scatter and attenuation of gamma ray, produced noise in electronic and photomultipliers tubes and detection efficiency of imaging system causes to degrade image quality, contrast and brightness in the obtained images by SPECT systems. Despite of existence novel techniques of image reconstruction, this method is still the most widely used in practical experiment in nuclear medicine center, because of its facility and speed [3,4] In this method, acquisition data from recorded gamma ray in SPECT heads are filtered and backprojected by setting the entire arrays of the pre-defined image matrix along the ray pointing to the sample to the same value [5]. Because image noise dominant in high frequency regions in Fourier domain, low-pass or smoothing filters are usually applied to projection images before reconstruction to reduce produced noise early in the process chain
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