A Method to Improve the Accuracy of the Bioelectrical Impedance Phase-Angle Measuring System

被引:0
|
作者
Nguyen Ngoc Tram [1 ]
Trinh Duc Nam [2 ]
Truong Xuan Thanh [3 ]
Tran Quang Do [4 ]
Dinh Hong Thai [5 ]
Vu Duy Hai [1 ]
机构
[1] Hanoi Univ Sci & Technol, Sch Elect Telecommun, Hanoi, Vietnam
[2] BME HUST, Minist Hlth, Dept Med Equipment & Contruct, Hanoi, Vietnam
[3] BME HUST, Friendship Hosp, Informat Technol Dept, Hanoi, Vietnam
[4] BME HUST, Bach Mai Hosp, Dept Med Equipment & Consumables, Hanoi, Vietnam
[5] BME HUST, Viet Duc Univ Hosp, Dept Med Equipment & Consumables, Hanoi, Vietnam
来源
2021 15TH INTERNATIONAL CONFERENCE ON ADVANCED COMPUTING AND APPLICATIONS (ACOMP 2021) | 2021年
关键词
Bioelectrical impedance; phase-angle; nutritional assessment; voltage to current converter; comparator; phase lock loop; phase-difference detector; BODY-COMPOSITION; NUTRITIONAL-STATUS; CANCER; MALNUTRITION; MASS;
D O I
10.1109/ACOMP53746.2021.00030
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
The bioelectric impedance phase difference (BIPA) is a characteristic quantity for the changes in the electrical properties of the tissue, obtained from the Bioelectrical Impedance Analysis (BIA). Nowadays, the need for an automatic, specialized and safe device to measure BIPA in medical facilities is very pressing. One method that has been proposed to measure this parameter is to use a multiplier and calculate the value of the phase difference between the two signals. The bias (mean) (+/- SD) of the measurement of the phase difference between two signals with programmed phases using this method was 0.5 +/- 0.2. Consequently, to improve the accuracy of the measurement results, this study was conducted to propose another signal processing method which is based on the comparator and the operating principle of the phase lock loop for the BIPA measurement system. This system still consists of an analog signal generator at 100kHz, a current source circuit. However, the signal processors which process signal received from the body consist of an analog-to-pulse converter and a phase-difference detector. The phase angle between the two signals is then calculated from the DC voltage obtained at the output of the phase-difference detector and compared with the programmed one. The phase difference between the two programmed signals ranges from 5 degrees to 8 degrees with an increment of 0.5 degrees. The obtained results show that the bias of the measurement performed by the system using the proposed method is -0.01, the precision was 0.07 and percentage error was 4.31%.
引用
收藏
页码:169 / 175
页数:7
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