Subjects: Biology >> Bioengineering submitted time 2018-03-15
Abstract：基于区域的几何活动轮廓（Chan-Vese, CV）模型是乳腺超声图像常用的一种分割算法。但传统的CV模型不能满足乳腺超声图像分割精度高、速度快的要求。因此，文章提出了一种基于指数加权平均比率（Ratio of Exponential Weighted Average，ROEWA）算子改进的CV模型，用于乳腺超声图像中病灶区域的分割。首先，计算乳腺超声图像的ROEWA算子。其次，基于图像的ROEWA算子构建边缘指示函数，用于代替CV模型中的Dirac项。最后，去除平滑项，从而提高曲线演化的速度。实验结果表明，文章提出的算法不仅能提高分割的精度，而且能显著提高分割的速度。
Peer Review Status:
Awaiting Review
Subjects: Biology >> Bioengineering submitted time 2018-03-14
Abstract： Infrared physiotherapy is a new method with the application of infrared light to human body parts, whose effect has been widely reported in the treatment of various diseases. Nowadays,the effectiveness of the infrared physiotherapy wasgenerally assessed by the experience of the medical staffqualitatively. As the parameters of blood flow is the key of physiotherapy evaluation, using a noninvasive, safe, and real time monitoring way onblood flow during therapy will benefit guiding the physiotherapy arrangement to enhance the therapy effect.This paper proposes a method based on bioimpedance technology for infrared physiotherapy evaluation in human arm.Firstly, we choose the BIOPAC physiological information recorder as the core of measure system, withdouble-probe method to measure ECG signal, and four-probe way to synchronously measure the bioimpedance change of human armbefore, during and after the infrared irradiation. Then removing baseline drift and extracting feature points by using wavelet transform, applying simple Bayesian model to ensure the stability of the feature points.The experimental results show that (1)The arm bioimpedance signal characteristic frequency matches the heart rate with an average difference 0.09%-1.60%. (2)After the infrared irradiation, the ratio between secondary and the main wave peaks of arm bioimpedance rises 3.91%-13.05%, namely, bioimpedance can represent the change in arm blood flow, and sensitive enough to make an evaluation of infrared physiotherapy.
Peer Review Status:Awaiting Review
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