Home > Published Issues > 2023 > Volume 11, No. 3, September 2023 >
JOIG 2023 Vol.11(3): 282-287
doi: 10.18178/joig.11.3.282-287

A Method for Enhancing PET Scan Images Using Nonlocal Mean Filter

Raghad Hazim Hamid 1, Nagham Tharwat Saeed 1, and Hasan Maher Ahmed 2,*
1. Department of Computer Science, College of Education for Pure Science, University of Mosul, Mosul, Iraq; Email: raghad1986@uomosul.edu.iq (R.H.H.); nagham.th@uomosul.edu.iq (N.T.S.)
2. Software department, College of Computer Science and Mathematics, University of Mosul, Mosul, Iraq
*Correspondence: hasanmaher@uomosul.edu.iq (H.M.A.)

Manuscript received November 24, 2022; revised February 2, 2023; accepted March 1, 2023

Abstract—Medical images are an important source of information for both diagnosing and treating diseases. In many cases, the images produced by a Positron Emission Tomography (PET) scan are used to assess the effectiveness of a particular treatment. This paper presents a method for whole-body PET image denoising using a spatially-guided non-local means filter. The proposed method starts with clustering the images into regions. To estimate the noise, a Bayesian with automatic settings of the parameters was used. Then, only patches that belong to regions were collected and processed. The performance was compared to two methods; Gaussian and conventional Non-Local Means (NLM). The Jaszczak phantom and PET/ Computed Tomography (CT) for whole-body were involved in the benchmarking. The obtained results showed that in the Jaszczak phantom, the Signal-to-Noise Ratio (SNR) was significantly improved. Additionally, the proposed method improved the contrast and SNR compared to conventional NLM and Gaussian. Finally, the proposed method, in clinical whole-body PET, can be considered as another way of the post-reconstruction filter.

Keywords—image denoising, image enhancing, medical images, Non-Local Means (NLM) filter, Positron Emission Tomography (PET)/ Computed Tomography (CT) images

Cite: Raghad Hazim Hamid, Nagham Tharwat Saeed, and Hasan Maher Ahmed *, "A Method for Enhancing PET Scan Images Using Nonlocal Mean Filter," Journal of Image and Graphics, Vol. 11, No. 3, pp. 282-287, September 2023.

Copyright © 2023 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.