대한방사선기술학회지:방사선기술과학 (Journal of radiological science and technology)

  • 제46권6호
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  • Pages.475-484
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  • 2023
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  • 2288-3509(pISSN)
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  • 2384-1168(eISSN)
대한방사선과학회 (Korean Society of Radiological Science)
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간 초음파 영상에서의 스페클 노이즈 제거를 위한 필터들의 비교 평가

Comparative Evaluation of Filters for Speckle Noise Reduction in a Clinical Liver Ultrasound Image

  • 김하진 (가천대학교 일반대학원 보건과학과) ;
  • 이영진 (가천대학교 방사선학과)
  • Hajin Kim (Department of Health Science, General School of Gachon University) ;
  • Youngjin Lee (Department of Radiological Science, Gachon University)
  • 투고 : 2023.10.10
  • 심사 : 2023.11.15
  • 발행 : 2023.12.31
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초록

This study aimed to compare filters for reducing speckle noise in ultrasound images using clinical liver images. We acquired the clinical liver ultrasound images, and noisy images were obtained by adding 0.01, 0.05, 0.10, and 0.50 intensity levels of speckle noise to the liver images. The Wiener filter, median modified Wiener filter, gamma filter, and Lee filter were designed for the noisy images by setting window sizes at 3×3, 5×5, and 7×7. The coefficient of variation (COV) and contrast to noise ratio (CNR) were calculated to evaluate noise reduction and various filters. Moreover, the filter with the highest image quality was selected and quantitatively compared to a noisy image. As a result, COV and CNR showed the noise improved result when the Lee filter was applied. Furthermore, the Lee filter image with a window size of 7×7 was noted to possess approximately a minimum of 1.28 to a maximum of 3.38 times better COV and a minimum of 2.18 to a maximum of 5.50 times better CNR than the noisy image. In conclusion, we confirmed that the Lee filter was effective in reducing speckle noise and proved that an appropriate window size needs to be set considering blurring.

키워드

과제정보

This paper is supported by the academic activities grant from the society of Incheon Radiological Technologists Association (IRTA) of the Korean Radiological Technologists Association (KRTA) in 2023.

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