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1

Exploratory study on remote photoplethysmography using visible light cameras

Szabała Tomasz, Vejar Andres

Przegląd Elektrotechniczny

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2023

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R. 99, nr 1

282--285

EN

With visible light video cameras, it is possible to estimate the cardiac pulse, tracking the intensity changes in the image produced by the blood volume variations in the microvascular tissue. This estimation is provided by a measuring technique called remote photoplethysmography (RPPG). In this study we explore the data acquisition of the RPPG using standard video cameras used in personal computers.

PL

Za pomocą kamer wideo w świetle widzialnym można oszacować tętno serca, śledząc zmiany intensywności obrazu wytwarzanego przez zmiany objętości krwi w tkance mikronaczyniowej. Oszacowanie to zapewnia technika pomiarowa zwana fotopletyzmografią zdalną (RPPG). W tym badaniu badamy akwizycję danych z RPPG przy użyciu standardowych kamer wideo używanych w komputerach osobistych.

2

Detection of type-2 diabetes using characteristics of toe photoplethysmogram by applying support vector machine

Nirala Neelamshobha, Periyasamy R., Singh Bikesh Kumar, Kumar Awanish

Biocybernetics and Biomedical Engineering

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2019

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Vol. 39, no. 1

38--51

EN

Diabetes mellitus (DM) is one of the most widespread and rapidly growing diseases. With its advancement, DM-related complications are also increasing. We used characteristic features of toe photoplethysmogram for the detection of type-2 DM using support vector machine (SVM). We collected toe PPG signal, from 58 healthy and 83 type-2 DM subjects. From each PPG signal 37 different features were extracted for further classification. To improve the performance of SVM and reduce the noisy data we employed hybrid feature selection technique that reduces the feature set of 37 to 10 on the basis of majority voting. Using 10 selected features set, we gained an accuracy of 97.87%, sensitivity of 98.78% and specificity of 96.61%. Further for the validation of our method we need to do random population test, so that it can be used as a non-invasive screening tool. Photoplethysmogram is an economic, technically easy and completely non-invasive method for both physician and subject. With the high accuracy that we obtained, we hope that our work will help the clinician in screening of diabetes and adopting suitable treatment plan for preventing end organ damage.

3

Study on ballistocardiogram acquisition in a moving wheelchair with embedded sensors

Pinheiro E., Postolache O., Girao P.

Metrology and Measurement Systems

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2012

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Vol. 19, nr 4

739-750

EN

Embedding cardiac system sensing devices in wheelchairs is both necessary and attractive. Elders, diabetics, or stroke victims are a substantial group needing permanent cardiac monitoring, without restriction of their already limited mobility. A set of sensing devices was embedded in a wheelchair to monitor the user without his awareness and intervention. A dual-wavelength reflection photoplethysmogram (PPG), and a ballistocardiogram (BCG) based on MEMS accelerometers and on electromechanical film sensors are output by the hardware. Tests were conduced on twenty one subjects, for an immobility scenario. Additional recordings were made for helped propulsion over a tiled floor course, with good results in keeping track of acceleration BCG and PPG. A treadmill was also used for tests, providing a smooth floor and constant speed and inclination. The PPG and acceleration BCG could be continuously monitored in all the tests. The developed system proves to be a good solution to monitor cardiac activity of wheelchair users even during motion.