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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제51권 제3호
발행연도
2019.1
수록면
719 - 722 (4page)

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초록· 키워드

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Gamma-ray images generally suffer from a lot of noise because of low photon detection in the gammacamera system. The purpose of this study is to improve the image quality in gamma-ray images using agamma camera system with a fast nonlocal means (FNLM) noise reduction algorithm with an accelerationfunction. The designed FNLM algorithm is based on local region considerations, including theEuclidean distance in the gamma-ray image and use of the encoded information. To evaluate the noisecharacteristics, the normalized noise power spectrum (NNPS), contrast-to-noise ratio (CNR), and coefficientof variation (COV) were used. According to the NNPS result, the lowest values can be obtainedusing the FNLM noise reduction algorithm. In addition, when the conventional methods and the FNLMnoise reduction algorithm were compared, the average CNR and COV using the proposed algorithm wereapproximately 2.23 and 7.95 times better than those of the noisy image, respectively. In particular, theimage-processing time of the FNLM noise reduction algorithm can achieve the fastest time comparedwith conventional noise reduction methods. The results of the image qualities related to noise characteristicsdemonstrated the superiority of the proposed FNLM noise reduction algorithm in a gammacamera system.

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