Affiliation:
1. School of Biomedical Science, Huaqiao University Quanzhou China
2. College of Engineering, Huaqiao University Quanzhou China
Abstract
AbstractWe proposed a novel method to separate static and dynamic speckles based on spatial frequency domain filtering. First, the raw speckle image sequence is processed frame by frame through 2D Fourier transform, low‐pass and high‐pass filtering in the spatial frequency domain, and inverse Fourier transform. Then, we can obtain low‐ and high‐frequency image sequences in the spatial domain. Second, we averaged both sequences in the time domain. After the above processing, we obtain the mean intensities of the dynamic and static speckle components in the spatial domain. Finally, we calculated the time‐averaged modulation depth to map the 2‐D blood flow distribution. Both phantom and vivo experiments demonstrated that the proposed method could effectively suppress the background non‐uniformity and has the advantage of high computational efficiency. It also can effectively improve image contrast, contrast‐to‐noise ratio, and imaging dynamic range.
Subject
General Physics and Astronomy,General Engineering,General Biochemistry, Genetics and Molecular Biology,General Materials Science,General Chemistry
Cited by
1 articles.
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