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Journal Biomedical Radioelectronics №10 for 2009 г.
Article in number:
Bio-Radiolocation Method at Chest Wall Motion Analysis During Tidal Breathing
Keywords: bio-radiolocation quick-shot camera method correlation analysis
Authors:
M.D. Alekhin, L.N. Anishchenko, D.A. Korchagina
Abstract:
The influence of chest wall surface motion in bio-radar signal during tidal breathing was researched. A quick-shot camera and multifrequency radar with signal step modulation were simultaneously applied. Pairwise correlation coefficients for all the markers on the chest wall were calculated. The correlation of data from quick-shot camera and bio-radar was found. The two methods were compared. A multifrequency radar with signal step modulation, designed at Remote Sensing Laboratory of Bauman Moscow State University, was applied. Signals were recorded on 16 operating frequencies in range of 3.6-4.0 GHz. When carrying out the experiments, a young male subject was seated on a chair. Five sections of markers situated on the chest wall were used. The distances between the levels and two next markers in one section were 7cm each. The markers represented crosses on stickers made by gel ink pen. The vertical axis through the navel was chosen as a central one. The antennas of the bio-radar and the camera itself were fixed at a distance of 80 cm to the subject by means of tripods. The camera and the radar were working simultaneously. The recordings lasted for approximately 10 seconds each. One of them was chosen for the further processing and analyzing. The analysis of the data allows supposing that the chest wall surface motion is reflected in bio-radar signal during tidal breathing. Rather high pairwise correlation coefficients are occurred for the markers, especially for those, situated on one half of the chest cage. Otherwise, for the symmetric markers on opposite halves the pairwise correlation is lower. These facts can be explained by the physiological skewness of the chest cage. The influence of such physiological peculiarities in abdominal sector is lower. So the pairwise correlation coefficients in this part of the chest wall are high. For male abdominal type of breathing is more character. The best correlation with the bio-radar signal is found for the markers on the lowest abdominal level.
Pages: 56-61
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