Prof. Dr.-Ing. habil. Hagen Malberg
Table of contents
Name
Prof. Dr. Hagen Malberg
Institute for Biomedical Engineering
Send encrypted mail via the SecureMail portal (for TUD external users only).
Institute for Biomedical Engineering
RESEARCH FOCUS
- medical terminology, biomedical engineering
assigned research projects:- medical terminology for biomedical engineers: multimedia, interactive learning and training system
- multimedia-based, interactive learning and training system: biomedical engineering for interdisciplinary technical education and continuing education
- Methods of clinical applications (Cardiology, intensive care, sleep fatigue, hypertensiology, rehabilitation)
assigned research projects:- Conducting a study to analyse medically related emergencies in vehicles
- Medical image processing, visualization and modelling / simulation
assigned research projects:- multimodal image data fusion and registration with autostereoscopic visualization to improve neurosurgical surgery planning and interaoperative navigation
- optical imaging for intraoperative identification of functionally active brain areas / perfusion assessment
- Automation mechatronic systems in medicine (organ perfusion, rehabilitation technology)
assigned research projects:- development of physical models of intestine, liver and stomach for exercise and training purposes for open and minimally invasive surgical intervention
- device system for normothermic extracoporeal liver perfusion
- healthy children - healthy europe: cross-border model project for Medical Services in the European City of Görlitz / Zgorzelecodel
- Theragnos, Blended Learning BMT, BME 2.0
assigned research projects:- Multimedia, interactive learning and training system: Biomedical Technology for interdisciplinary technical education and continuing education
CURRICULUM VITAE
University Professor (W3) and Head of the Chair of Biomedical Engineering | |
CURRENT PUBLICATIONS
1 bis 10 von 33 Einträgen
Diese Informationen werden vom Vorgängersystem FIS bereitgestellt.
CURRENT RESEARCH
kontaktlose Überwachung von Intensivpatienten
Titel (Englisch)
Camera-based Photoplethysmography in Critical Care Patients
Kurzbeschreibung (Deutsch)
.
Kurzbeschreibung (Englisch)
Camera-based photoplethysmography (cbPPG) is an optical measurement technique that remotely reveals pulsatile blood flow in cutaneous microcirculation. It has been shown to reflect pivotal hemodynamic events like cardiac ejection in healthy subjects. In addition, it provides valuable insight into intrinsic microcirculatory regulation as it yields dynamic, two-dimensional perfusion maps. In this study, we describe the feasibility of a clinical cbPPG application in critical care patients.
A mobile camera set-up to record faces of patients at the bed site was constructed. Videos were made during the immediate recovery after cardiac surgery under standard critical care conditions and were processed offline. Major motion artefacts were detected using an optical flow technique and suitable facial regions were manually annotated. CbPPG signals were highpass filtered and Fourier spectra out of consecutive 10s signal segments calculated for heart rate detection. Signal-to-noise ratios (SNR) of the Fourier spectra were derived as a quality measure. Reference data of vital parameters were synchronously acquired from the bed site monitoring system.
Seventy patient videos of an average time of 28.6±2.8 min were recorded. Heart rate (HR) was detected within a ±5bpm range compared to reference in 83% of total recording time. Low SNR and HR detection failure were mostly, but not exclusively, attributed to non-physiological events like patient motion, interventions or sudden changes of illumination. SNR was reduced by low arterial blood pressure, whereas no impact of other perioperative or disease-related parameters was identified.
Cardiac ejection was detectable by cbPPG under pathophysiologic conditions of cardiovascular disease and perioperative medicine. CbPPG measurements can be seamlessly integrated into the clinical work flow of critical care patients. In 2016 the strategy was refined and a thermosensitive camera implemented. A secound focus of interest was introduced in the project: The influence of the havested mamaria on microcirulatory balance in the attached part of the thorax is under investigation.
A mobile camera set-up to record faces of patients at the bed site was constructed. Videos were made during the immediate recovery after cardiac surgery under standard critical care conditions and were processed offline. Major motion artefacts were detected using an optical flow technique and suitable facial regions were manually annotated. CbPPG signals were highpass filtered and Fourier spectra out of consecutive 10s signal segments calculated for heart rate detection. Signal-to-noise ratios (SNR) of the Fourier spectra were derived as a quality measure. Reference data of vital parameters were synchronously acquired from the bed site monitoring system.
Seventy patient videos of an average time of 28.6±2.8 min were recorded. Heart rate (HR) was detected within a ±5bpm range compared to reference in 83% of total recording time. Low SNR and HR detection failure were mostly, but not exclusively, attributed to non-physiological events like patient motion, interventions or sudden changes of illumination. SNR was reduced by low arterial blood pressure, whereas no impact of other perioperative or disease-related parameters was identified.
Cardiac ejection was detectable by cbPPG under pathophysiologic conditions of cardiovascular disease and perioperative medicine. CbPPG measurements can be seamlessly integrated into the clinical work flow of critical care patients. In 2016 the strategy was refined and a thermosensitive camera implemented. A secound focus of interest was introduced in the project: The influence of the havested mamaria on microcirulatory balance in the attached part of the thorax is under investigation.
Zeitraum
01.06.2013 - 31.12.2017
Art der Finanzierung
Drittmittel
Projektleiter
- Herr Prof. Dr. med. habil. Klaus Matschke
- Herr Dr. med. Stefan Rasche
Projektmitarbeiter
- Herr Christian Georgi
- Frau Dr. rer. nat. Katrin Plötze
- Herr Dr. med. Tamer Ghazy
Weitere Mitarbeiter (außerhalb des Lehrstuhls)
Prof. Dr. Ing. habil. Hagen Malberg
Kooperationspartnerschaft
keine
Website zum Projekt
Relevant für den Umweltschutz
Nein
Relevant für Multimedia
Nein
Relevant für den Technologietransfer
Nein
Schlagwörter
kontaktlose Überwachung Vitalparameter
Berichtsjahr
2017