The image blood pressure research based on microcirculation
|關鍵字:||甲襞;血壓;經驗模態分解;諧波;nailfold;blood pressure;empirical mode decomposition;harmonics|
The greatest wealth is health. This study focuses on blood pressure of three high indicators. It is a hope that blood pressure can be measured without applying pressure. The method approaches from the nailfold capillaries to obtain blood flow wave signals by recording images. Then infer the value of blood pressure from the relation between blood flow wave and blood pressure wave. This study is divided into two parts, the microcirculation and blood pressure. The self-made instrument is used in the measurement of microcirculation and photoplethysmography (PPG) signals are obtained. The phenomenon of baseline wander is removed by empirical mode decomposition (EMD). Then the microcirculation index is obtained. Through the change of the index, it will be known that how different items work on microcirculation of human's face; The nailfold microscope is used in the measurement of blood pressure and signals obtained from the recording films will be analyzed. First, the blurred segments of the film is distinguished. Second, connect the removed blurred segments by the monotonic cubic interpolation method. Third, motion artifact reduction is used to eliminate the noise caused by shaking. Finally, calculate the value of blood pressure by the obtained characteristics. In the future, this method is respected to be applied on other films rather than limited to nailfold films. In the experiment, the heart rate can be measured by the cell phone films. In other word, if the blood pressure can be measured by cell phone films, the goal of cuffless blood pressure measurements can be achieved by an app and then spread to everyone with smartphones.
|Appears in Collections:||Thesis|