Remote Health Care Monitoring Based on the Internet Transmission System of a Patient's Essential Body Functions (Preprint)
Authors: Lu Hao-Chun , Kung Woon-Man , Chen Shuo-Tsung 
Published: December 2020

BACKGROUND

With Electrocardiogram (ECG) signals and Internet of things (IoT), we may have a remote observation for several clinical measurements, specifically pulse rate, intracranial pressure, respiration rate, and blood pressure, that indicate the state of a patient's essential body functions. Moreover, we can utilize ECG signals to analyze and identify various heart diseases from a distance, such as arrhythmias, myocardial damage etc. This study aims to propose an IoT-based transmission system for the state care of a patient's essential body functions. The system also protects personal privacy and reduces the carrying amount in ECG network transmission. First of all, we perform the proposed patients state steganography on the ECG signals. At the same time, we adopt the threshold-based compression to reduce the data amount of the ECG signals in patients information transmission. The recovery of the compressed ECG signal adopts cubic spline. In addition, the performance of the proposed steganography is enhanced by Particle Swarm Optimization (PSO). Experimental results verify the efficiency of the proposed method.

OBJECTIVE

In the proposed concept as shown in Fig. 3, original ECGs and patients confidential information are first combined by the proposed method (see Fig. 4 in detail) to obtain the hidden and compressed ECG. Next, the hidden and compressed ECGs are transferred to terminal equipment such as hospital server via wireless network. Finally, hospital server will extract the patients information and distribute it to different devices of doctors and nurses.

METHODS

This study proposes a time-domain algorithm to integrate threshold-based compression and PSO-based biomedical signal steganography. Because ECG has high requirements for accuracy, so we rewritten signal-to-noise ratio (SNR) and amplitude-quantization to performance index and constraint so that we obtain an optimization model to enhance ECG quality and robustness against attacks. In addition, the optimization model is solved by Particle Swarm Optimization (PSO). Accordingly, we perform amplitude-quantization steganography on each ECG signal to embed patient information. At the same time, we adopt the threshold-based compression technology to reduce the data amount of the embedded ECG signal. In addition, the hidden information can be extracted without the original ECG and the recovery of the compressed ECG signal adopts cubic spline. In experiments, we evaluate the appropriate threshold ε and embedding strength Q. The proposed method reduces the carrying amount of network transmission while preserving the original characteristics of ECG signals and protecting personal privacy.

RESULTS

Our method remains high quality for each hidden ECG signal or hidden and compressed ECG signal under sufficient hiding capacity 2048 bits no matter how the quantization size Q is increased.

CONCLUSIONS

The proposed method not only protect the security of the ECG transmission but also reduce the amount of ECG transmission. Moreover, the proposed method improves the drawback that the quality of each hidden ECG signal is greatly reduced as the quantization size Q is increased. In other words, our method remains high quality for each hidden ECG signal or hidden and compressed ECG signal no matter how the quantization size Q is increased.

CLINICALTRIAL

No trial registration.