To improve the noise characteristics, software-based noise reduction algorithms are widely used in cadmium zinc telluride (CZT) pixelated semiconductor gamma camera system. The purpose of this study was to develop an improved median filtering algorithm using a thresholding method for noise reduction in a CZT pixelated semiconductor gamma camera system. | Performance evaluation of noise reduction algorithm with median filter using improved thresholding method in pixelated semiconductor gamma camera system: A numerical simulation study Nuclear Engineering and Technology 51 (2019) 439e443 Contents lists available at ScienceDirect Nuclear Engineering and Technology journal homepage: Original Article Performance evaluation of noise reduction algorithm with median filter using improved thresholding method in pixelated semiconductor gamma camera system: A numerical simulation study Youngjin Lee Department of Radiological Science, Gachon University, 191, Hambakmoero, Yeonsu-gu, Incheon, Republic of Korea a r t i c l e i n f o a b s t r a c t Article history: To improve the noise characteristics, software-based noise reduction algorithms are widely used in Received 5 April 2018 cadmium zinc telluride (CZT) pixelated semiconductor gamma camera system. The purpose of this study Received in revised form was to develop an improved median filtering algorithm using a thresholding method for noise reduction 28 September 2018 in a CZT pixelated semiconductor gamma camera system. The gamma camera system simulated is a CZT Accepted 5 October 2018 Available online 5 October 2018 pixelated semiconductor detector with a pixel-matched parallel-hole collimator and the spatial resolu- tion phatnom was designed with the Geant4 Application for Tomography Emission (GATE). In addition, a noise reduction algorithm with a median filter using an improved thresholding method is developed and Keywords: Medical application we applied our proposed algorithm to an acquired spatial resolution phantom image. According to the Gamma camera system results, the proposed median filter improved the noise characteristics compared to a conventional me- Pixelated semiconductor detector dian filter. In particular, the average for normalized noise power spectrum, contrast to noise .
