Evidence map›Paper›PMID 35161977›Full record

ArticleSensors (Basel, Switzerland)2022

Automated Lung Sound Classification Using a Hybrid CNN-LSTM Network and Focal Loss Function.

Georgios Petmezas, Grigorios-Aris Cheimariotis, Leandros Stefanopoulos, Bruno Rocha, Rui Pedro Paiva, Aggelos K Katsaggelos, Nicos Maglaveras

Open access · goldAbstract read
In one paragraph

Article in Sensors (Basel, Switzerland), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed, 1 pooled it
23.9field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed, 1 synthesis or guideline pooled it, 170 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 3 countries.

Georgios PetmezasLaboratory of Computing, Medical Informatics and Biomedical-Imaging Technologies, Medical School, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece.ORCID 0000-0002-3371-569X
Grigorios-Aris CheimariotisLaboratory of Computing, Medical Informatics and Biomedical-Imaging Technologies, Medical School, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece.
Leandros StefanopoulosLaboratory of Computing, Medical Informatics and Biomedical-Imaging Technologies, Medical School, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece.ORCID 0000-0002-2682-5639
Bruno RochaCentre for Informatics and Systems, Department of Informatics Engineering, University of Coimbra, 3030-290 Coimbra, Portugal.ORCID 0000-0003-1643-667X
Rui Pedro PaivaCentre for Informatics and Systems, Department of Informatics Engineering, University of Coimbra, 3030-290 Coimbra, Portugal.
Aggelos K KatsaggelosDepartment of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208, USA.
Nicos MaglaverasLaboratory of Computing, Medical Informatics and Biomedical-Imaging Technologies, Medical School, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece.ORCID 0000-0002-4919-0664
Aristotle University of Thessaloniki · GRUniversity of Coimbra · PTNorthwestern University · US

Funding

European Commission 210510516Fundação para a Ciência e Tecnologia (FCT) SFRH/BD/135686/2018 and 2020.04927.BD
6 · The paper itself

Abstract

Respiratory diseases constitute one of the leading causes of death worldwide and directly affect the patient's quality of life. Early diagnosis and patient monitoring, which conventionally include lung auscultation, are essential for the efficient management of respiratory diseases. Manual lung sound interpretation is a subjective and time-consuming process that requires high medical expertise. The capabilities that deep learning offers could be exploited in order that robust lung sound classification models can be designed. In this paper, we propose a novel hybrid neural model that implements the focal loss (FL) function to deal with training data imbalance. Features initially extracted from short-time Fourier transform (STFT) spectrograms via a convolutional neural network (CNN) are given as input to a long short-term memory (LSTM) network that memorizes the temporal dependencies between data and classifies four types of lung sounds, including normal, crackles, wheezes, and both crackles and wheezes. The model was trained and tested on the ICBHI 2017 Respiratory Sound Database and achieved state-of-the-art results using three different data splitting strategies-namely, sensitivity 47.37%, specificity 82.46%, score 64.92% and accuracy 73.69% for the official 60/40 split, sensitivity 52.78%, specificity 84.26%, score 68.52% and accuracy 76.39% using interpatient 10-fold cross validation, and sensitivity 60.29% and accuracy 74.57% using leave-one-out cross validation.

Indexed as

Quality of LifeRespiratory SoundsAuscultationHumansLungNeural Networks, ComputerasthmaCNNCOPDcracklesfocal lossLSTMlung soundsSTFTwheezes

Identifiers

PMID35161977
PMCPMC8838187
OpenAlexW4210428539

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.