Improved ECG-Derived Respiration Using Empirical Wavelet Transform and Kernel Principal Component Analysis.

Many methods have been developed to derive respiration signals from electrocardiograms (ECGs). However, traditional methods have two main issues: (1) focusing on certain specific morphological characteristics and (2) not considering the nonlinear relationship between ECGs and respiration. In this paper, an improved ECG-derived respiration (EDR) based on empirical wavelet transform (EWT) and kernel principal component analysis (KPCA) is proposed.

Automatic segmentation for ultrasound image of carotid intimal-media based on improved superpixel generation algorithm and fractal theory.

Objective: Carotid atherosclerosis (CAS) is the main reason leading to cardiovascular conditions such as coronary heart disease and cerebrovascular diseases. In the carotid ultrasound images, the carotid intima-media structure can be observed in an annular narrow strip, which its inner contour corresponds to the carotid intima, and the outer contour corresponds to the carotid extima. With the development of carotid atherosclerosis, the carotid intima-media will gradually thicken.

[Curvelet denoising algorithm for medical ultrasound image based on adaptive threshold].

The traditional denoising algorithm for ultrasound images would lost a lot of details and weak edge information when suppressing speckle noise. A new denoising algorithm of adaptive threshold based on curvelet transform is proposed in this paper. The algorithm utilizes differences of coefficients' local variance between texture and smooth region in each layer of ultrasound image to define fuzzy regions and membership functions.

[Progress in research and application of time-resolved optoacoustic method in biomedicine].

Based on optoacoustic effect, time-resolved optoacoustic technique effectively combines optical technology with acoustic technology and partly overcomes the biological tissue's scatter characteristics which might influence the results of measurement. Optoacoustic technique has the advantages of high sensitivity and high resolution and has been widely applied in biomedicine field. In this paper, the measuring principles, the key technique, application and future direction of this technique are synthetically reviewed to promote the research in theory and application in the future.