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Different noninvasive or minimally invasive therapeutic ablation procedures can produce tissue necrosis associated with local-stiffness increase. Although elastography has been proved as a potential evaluation tool for many kinds of ablation-induced lesions, the application of subtraction technique in elastography to enhance the visualization of the ablation lesions has rarely been reported. In this...
There are many approaches which use breath gas to diagnose disease such as lung cancer, breast cancer and diabetes. But, it has not been used in medical field because of low accuracy by low concentration of target component (ppt, ppb level). According to previous study, end-tidal concentrations of volatile organic component (VOC) correlated with carbon dioxide (CO2) levels. So, we propose CO2 measurement...
In this work, we proposed a method for a binary classification in an EEG-based brain computer interface (BCI) with wavelet packet transform and neural networks. For feature extraction, we introduced a new method which combined the slow cortical potentials (SCPs) and the specific energy from the time-frequency domain in beta-band via the wavelet packet transform. A 3-layer perceptron established by...
The purpose of this paper is to study the method to assess function status of cardiovascular system effectively in order to guide prevention and protection. In this study an exercise testing was performed in two groups. 60 elder hypertensives were chosen as a group at relative worse healthy status, and 60 young healthy subjects were chosen as a group at relative good healthy status. By discrete wavelet...
In ultrasound elastography, tissue axial strains are calculated from the gradient of the estimated axial displacements. However, the common differentiation operation amplifies the noises in the displacement estimation, especially at high frequencies. In this paper, a low-pass digital differentiator (LPDD) is proposed to calculate the axial strain from the estimated tissue displacement. Several LPDDs...
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