By Gaetano D Gargiulo; Alistair McEwan
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Extra info for Advanced biomedical engineering
2. 1 Research data source With informed consent, 517 sets of testing data were collected from 318 subjects. The ages of subjects range from 1 to 91 years (mean ± SD, 55 ± 20). 87 subjects were chosen from normal people (mean ±SD, 51 ±17) and the rest were recorded from patients in Department of Cardiology at Shandong Provincial Hospital in China (mean ± SD, 62 ±13). Normal people were assigned to the control group corresponding to the patients group. All medical records were collected in order to do research on each risk factor.
Fourier transform calculates the frequency, amplitude, and phase based on this theory. Significant features could be detected by Fourier transform from similar time series data with big differences in frequency domain. The Fourier transform can be treated as a special calculus formula that expresses the qualified function into sine basis functions. The function with the lowest frequency is called the fundamental. It has the same repetition rate of the periodic signal under evaluation. The frequency of other functions is integer times of the fundamental frequency.
36 Advanced Biomedical Engineering This class of waveform is characterized by separated systolic component and diastolic component. The pulse pressure decreased to a very low lever before the diastolic component and the diastolic part is relatively bigger. Fig. 3. Pulse wave for Dilated cardiomyopathy 3. Pulse wave monitoring system Analysis techniques have strength on different areas. Pulse wave factors have good detection rate for cardiovascular risks. Waveform analysis is more suitable for over all evaluation and cardiovascular health classification.