Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Dec 2007
[Development and validation of near-infrared brain blood-oxygen monitor].
The main purpose of this paper is to describe the design and development of the near-infrared blood-oxygen monitor which is based on the theory of detecting the blood-oxygen parameters of tissue by near-infrared, and the monitor can detect the blood-oxygen parameters of two sides of the local brain tissue. The monitor uses two wavelength ultra-high light LED as lamp-house, and two sensors detect the light scattered by two sides of the local brain tissue, which make the monitor achieve the function of dual detector. ⋯ At the same time, this apparatus can monitor continuously the brain blood-oxygen parameters of the patients in real time, and output the curves of the blood-oxygen and oxygen concentration of two sides of brain tissue. At last, the biological model experiments and the tests in clinical setting validate the monitor.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Dec 2007
[Multimodal medical image registration using cubic spline interpolation method].
Based on the characteristic of the PET-CT multimodal image series, a novel image registration and fusion method is proposed, in which the cubic spline interpolation method is applied to realize the interpolation of PET-CT image series, then registration is carried out by using mutual information algorithm and finally the improved principal component analysis method is used for the fusion of PET-CT multimodal images to enhance the visual effect of PET image, thus satisfied registration and fusion results are obtained. The cubic spline interpolation method is used for reconstruction to restore the missed information between image slices, which can compensate for the shortage of previous registration methods, improve the accuracy of the registration, and make the fused multimodal images more similar to the real image. Finally, the cubic spline interpolation method has been successfully applied in developing 3D-CRT (3D Conformal Radiation Therapy) system.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Oct 2007
[An improved weighted median filter and its application in EOG processing].
As a classic eye movement method, electrooculogram (EOG) has been extensively used in many applications. There are many different types of eye movements and artifact in the EOG signal. ⋯ The result of the simulation shows that this filter has the property of removing random noise more efficiently when preserving sharp edges. Finally, it is shown that the new filter is effective in separating saccadic and eye blink in the EOG signal.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Apr 2007
Review[Progress of studies for reduction of ghost artifact in magnetic resonance imaging].
The popularity of magnetic resonance imaging over other imaging disciplines depends predominantly on its high spatial resolution, soft tissue contrast, no hard fake trace and no radiation injury. However, the ghost artifacts produced during a magnetic resonance imaging would degrade the image badly and affect the precise orientation to focus. ⋯ A lot of researches indicated that how to reduce the ghost effectively is still a challenging task. Researchers should persist in seeking for new method to solve the difficult problem.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Apr 2007
[Detrended fluctuation analysis of physiological parameters during sleep].
Detrended fluctuation analysis (DFA) is fit for studies on the long-range exponential correlations of non-stationary time serial. In this paper, for elucidating the characteristics of different sleep stages, DFA is adopted to analyze the physiological data collected during sleep. ⋯ The experimental results reveal that the values of a differ much in different sleep stages,that the rules of EEG and SV are alike, that alpha increases with the deepening of sleep, but in inverse for R-R interval sequence that alpha decreases with the deepening of sleep. These indicate that the method of DFA is practical in the analysis of physiological parameters.