Diverse studies have demonstrated the importance of monitoring breathing rate (BR). Commonly, changes in BR are one of the earliest and major markers of serious complications/illness. However, it is frequently neglected due to limitations of clinically established measurement techniques, which require attachment of sensors. The employment of adhesive pads or thoracic belts in preterm infants as well as in traumatized or burned patients is an additional paramount issue. The present paper proposes a new robust approach, based on data fusion, to remotely monitor BR using infrared thermography (IRT). The algorithm considers not only temperature modulation around mouth and nostrils but also the movements of both shoulders. The data of these four sensors/regions of interest need to be further fused to reach improved accuracy. To investigate the performance of our approach, two different experiments (phase A: normal breathing, phase B: simulation of breathing disorders) on twelve healthy volunteers were performed. Thoracic effort (piezoplethysmography) was simultaneously acquired to validate our results. Excellent agreements between BR estimated with IRT and gold standard were achieved. While in phase A a mean correlation of 0.98 and a root-mean-square error (RMSE) of 0.28 bpm was reached, in phase B the mean correlation and the RMSE hovered around 0.95 and 3.45 bpm, respectively. The higher RMSE in phase B results predominantly from delays between IRT and gold standard in BR transitions: eupnea/apnea, apnea/tachypnea etc. Moreover, this study also demonstrates the capability of IRT to capture varied breathing disorders, and consecutively, to assess respiratory function. In summary, IRT might be a promising monitoring alternative to the conventional contact-based techniques regarding its performance and remarkable capabilities.

Chair for Medical Information Technology Helmholtz Institute for Biomedical Engineering RWTH Aachen University Aachen Germany

Czech Institute of Informatics Robotics and Cybernetics CTU Prague Prague Czech Republic

Department of Anesthesiology University Hospital RWTH Aachen Aachen Germany

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Resuscitation. 2004 Aug;62(2):137-41 PubMed

Annu Int Conf IEEE Eng Med Biol Soc. 2007;2007:250-3 PubMed

J Thorac Dis. 2015 Aug;7(8):1373-84 PubMed

Anesth Analg. 2014 Dec;119(6):1307-14 PubMed

Med J Aust. 2008 Oct 6;189(7):380-3 PubMed

Opt Express. 2010 May 10;18(10):10762-74 PubMed

J Am Geriatr Soc. 2013 Dec;61(12):2238-40 PubMed

Conf Proc IEEE Eng Med Biol Soc. 2004;2004:1196-9 PubMed

Nurs Times. 2010 Jan 19-25;106(2):12-4 PubMed

Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:4250-3 PubMed

Biomed Eng Online. 2011 Oct 20;10:93 PubMed

J Clin Monit Comput. 2015 Dec;29(6):721-6 PubMed

J Neurol. 2008 Nov;255(11):1687-92 PubMed

Annu Int Conf IEEE Eng Med Biol Soc. 2008;2008:2345-8 PubMed

Annu Int Conf IEEE Eng Med Biol Soc. 2013;2013:2672-5 PubMed

Psychophysiology. 2011 Jul;48(7):877-87 PubMed

Med J Aust. 2008 Jun 2;188(11):657-9 PubMed

PLoS One. 2013 Apr 23;8(4):e60304 PubMed

Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:4812-5 PubMed

Br J Nurs. 2012 May 24-Jun 13;21(10):621-5 PubMed

Intensive Care Med. 2012 Dec;38(12):1917-29 PubMed

Br J Anaesth. 2012 May;108(5):872-5 PubMed

IEEE Trans Pattern Anal Mach Intell. 2011 Nov;33(11):2259-72 PubMed

Sensors (Basel). 2012 Oct 15;12(10):13813-28 PubMed

Resuscitation. 2007 Apr;73(1):62-72 PubMed

Anesth Analg. 2004 Aug;99(2):379-82, table of contents PubMed

Biomed Opt Express. 2014 Mar 05;5(4):1075-89 PubMed

IEEE J Biomed Health Inform. 2014 Mar;18(2):654-60 PubMed

Nat Rev Neurosci. 2006 Mar;7(3):232-42 PubMed

Pediatr Pulmonol. 2011 Jun;46(6):523-9 PubMed

Biomed Opt Express. 2015 Oct 16;6(11):4378-94 PubMed

Dtsch Arztebl Int. 2014 Jul 21;111(29-30):503-8, i-v PubMed

IEEE Trans Biomed Eng. 2014 Nov;61(11):2760-7 PubMed

Respir Physiol Neurobiol. 2012 Oct 15;184(1):16-26 PubMed

IEEE Trans Biomed Eng. 2010 Apr;57(4):988-98 PubMed

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