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Sensors (Basel). 2019 Apr 15;19(8). pii: E1798. doi: 10.3390/s19081798.

Convolutional Neural Network for Breathing Phase Detection in Lung Sounds.

Author information

1
CINTESIS-Center for Health Technologies and Information Systems Research, Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal. cjacome@med.up.pt.
2
Medsensio AS, N-9037 Tromsø, Norway. johan@medsens.io.
3
Department of Computer Science, UiT The Arctic University of Norway, N-9037 Tromsø, Norway. einar.j.holsbo@uit.no.
4
General Practice Research Unit in Tromsø, Department of Community Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway. juan.c.solis@uit.no.
5
General Practice Research Unit in Tromsø, Department of Community Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway. hasse.melbye@uit.no.
6
Department of Computer Science, UiT The Arctic University of Norway, N-9037 Tromsø, Norway. lars.ailo.bongo@uit.no.

Abstract

We applied deep learning to create an algorithm for breathing phase detection in lung sound recordings, and we compared the breathing phases detected by the algorithm and manually annotated by two experienced lung sound researchers. Our algorithm uses a convolutional neural network with spectrograms as the features, removing the need to specify features explicitly. We trained and evaluated the algorithm using three subsets that are larger than previously seen in the literature. We evaluated the performance of the method using two methods. First, discrete count of agreed breathing phases (using 50% overlap between a pair of boxes), shows a mean agreement with lung sound experts of 97% for inspiration and 87% for expiration. Second, the fraction of time of agreement (in seconds) gives higher pseudo-kappa values for inspiration (0.73-0.88) than expiration (0.63-0.84), showing an average sensitivity of 97% and an average specificity of 84%. With both evaluation methods, the agreement between the annotators and the algorithm shows human level performance for the algorithm. The developed algorithm is valid for detecting breathing phases in lung sound recordings.

KEYWORDS:

automated classification; breath detection; breath onset; deep learning; respiratory phases; spectrograms

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