TY - CONF
TI - Comparative Analysis of Phase Difference Estimation Methods Quantifying
Asynchronies between Compartmental Chest Wall Volume Signals
AU - Golemati, Spyretta
AU - Moupagiatzis, Ioannis
AU - Athanasopoulos,
AU - Dimitrios
AU - Vasilopoulou, Maroula
AU - Roussos, Charalambos and
AU - Vogiatzis, Ioannis
PY - 2009
SP - 2871-2874
PB - IEEE Comput. Soc
T2 - 2009 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE
AND BIOLOGY SOCIETY, VOLS 1-20
TODO - 10.1109/IEMBS.2009.5333106
TODO - null
TODO - Asynchronous breathing movements may be observed in the presence of
pulmonary disease, such as chronic obstructive pulmonary disease (COPD).
This study was undertaken in an attempt to propose a reliable
methodology to quantify this asynchrony. Five methods for estimating
phase differences between two signals, based on the phase angle of the
Fourier Transform (PhDFT), paradoxical motion (PhDPM), the Lissajous
figure (PhDLF), maximal linear correlation (PhDP) and least-squares
filtering (PhDLS), were compared. Frequency-modulated signals,
simulating compartmental chest wall volumes, were used to evaluate the
methods. Breathing asynchrony was quantified in two ways; by estimating
(a) a single PhD value for the entire recording and (b) time-varying
PhDs, representing non-stationarities of human breathing. PhDPM and
PhDLS had the lowest average errors (4%), and PhDLS had a slightly
higher error. PhDFT had zero error when estimating a single PhD value
but a considerable error when estimating time-varying PhDs. PhDP
presented the highest errors in all cases. An application of this
methodology is proposed in real compartmental chest wall volume signals
of normal and COPD subjects. Preliminary results indicate that the
methodology is promising in quantifying differences in asynchronous
breathing between thoracic volumes of COPD patients and healthy
controls.
ER -