Marek Penhaker

Marek Penhaker
VŠB-Technical University of Ostrava · Department of Cybernetics and Biomedical Engineering

Doctor of Philosophy

About

226
Publications
46,810
Reads
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1,280
Citations
Introduction
Currently he is from 2004 Ph.D. tutor specialist for branch Technical Cybernetics. Through his career he published more than 100 original research articles including over 30 peer reviewed journal papers and more than 30 patents. He is author and coauthor of more than twenty books.
Additional affiliations
September 2011 - present
VŠB-Technical University of Ostrava
Position
  • Researcher
September 2000 - present
VŠB-Technical University of Ostrava
Position
  • Lecturer
Description
  • Founder, Guarantee and Lecturer of more than 23 subjects
September 2000 - present
VŠB-Technical University of Ostrava
Position
  • Researcher
Education
September 1997 - June 2000
VŠB-Technical University of Ostrava
Field of study
  • Ph.D. - Technical Cybernetics
September 1991 - June 1996
VŠB-Technical University of Ostrava
Field of study
  • Measurement and Control

Publications

Publications (226)
Article
Full-text available
The article deals with an overview of acute extremity compartment syndrome with a focus on the option of non-invasive detection of the syndrome. Acute extremity compartment syndrome (ECS) is an urgent complication that occurs most often in fractures or high-energy injuries. There is still no reliable method for detecting ECS. The only objective mea...
Article
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Wavelet transform (WT) is a commonly used method for noise suppression and feature extraction from biomedical images. The selection of WT system settings significantly affects the efficiency of denoising procedure. This comparative study analyzed the efficacy of the proposed WT system on real 292 ultrasound images from several areas of interest. Th...
Article
Objective: Vectorcardiography (VCG) as an alternative form of ECG provides important spatial information about the electrical activity of the heart. It achieves higher sensitivity in the detection of some pathologies such as myocardial infarction, ischemia and hypertrophy. However, vectorcardiography is not commonly measured in clinical practice, a...
Article
Full-text available
Vectorcardiography (VCG) is another useful method that provides us with useful spatial information about the electrical activity of the heart. The use of vectorcardiography in clinical practice is not common nowadays, mainly due to the well-established 12-lead ECG system. However, VCG leads can be derived from standard 12-lead ECG systems using mat...
Article
Noninvasive continuous blood pressure estimation is a promising alternative to minimally invasive blood pressure measurement using cuff and invasive catheter measurement, because it opens the way to both long-term and continuous blood pressure monitoring in ecological situation. The most current estimation algorithm is based on pulse transit time m...
Article
Vectorcardiography (VCG) as an alternative form of 12-lead ECG is another method of measuring the electrical activity of the heart. The use of vectorcardiography in clinical practice is not common, but VCG leads can be derived from 12-lead ECG. VCG has proven to be a useful and more accurate tool for diagnosing various heart diseases within automat...
Article
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In the area of musculoskeletal MR images analysis, the image denoising plays an important role in enhancing the spatial image area for further processing. Recent studies have shown that non-local means (NLM) methods appear to be more effective and robust when compared with conventional local statistical filters, including median or average filters,...
Article
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In this work, a MATLAB-based graphical user interface is proposed for the visual examination of several eye movements. The proposed solution is algorithm-based, which localizes the area of the eye movement, removes artifacts, and calculates the view trajectory in terms of direction and orb deviation. To compute the algorithm, a five-electrode confi...
Article
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Background: Here we aimed to evaluate the respiratory and cardiac-induced motion of a ICD lead used as surrogate in the heart during stereotactic body radiotherapy (SBRT) of ventricular tachycardia (VT). Data provides insight regarding motion and motion variations during treatment. Materials and methods: We analyzed the log files of surrogate mo...
Article
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There are various modern systems for the measurement and consequent acquisition of valuable patient’s records in the form of medical signals and images, which are supposed to be processed to provide significant information about the state of biological tissues [...]
Article
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Wearable devices are commonly used to monitor human movement since motor activity is a fundamental element in all phases of a person’s life. Patients with motor disorders need to be monitored for a prolonged period and the battery life can be a limit for such a goal. Here the technique of harvesting energy from body heat to supply energy to wearabl...
Chapter
Full-text available
This paper describes the concept of laboratory process based on measuring cardiac output using pulmonary artery thermodilution (trans-right-heart thermodilution) method. The blood circulation is in the process simulated by simple water flow in the measuring chain driven by water pump. Measuring is performed by Swan-Ganz catheter used in medical pra...
Article
In the area of biomedical signal monitoring, wearable electronics represents a dynamically growing field with a significant impact on the market of commercial products of biomedical signal monitoring and acquisition, as well as consumer electronic for vital functions monitoring. Since the electrodes are perceived as one of the most important part o...
Article
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Retinal blood vessel segmentation plays an important part in the early diagnosis and treatment of eye disease. It is a tool for ophthalmologists. Many diseases can be identified by examining manifestations and images of blood vessels, including diabetic retinopathy, retinopathy of prematurity, age-related macular degeneration, retinopathy due to hy...
Article
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Wavelet transformation is one of the most frequent procedures for data denoising, smoothing, decomposition, features extraction, and further related tasks. In order to perform such tasks, we need to select appropriate wavelet settings, including particular wavelet, decomposition level and other parameters, which form the wavelet transformation outp...
Article
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In this paper, a new approach for the periodical testing and the functionality evaluation of a fetal heart rate monitor device based on ultrasound principle is proposed. The design and realization of the device are presented, together with the description of its features and functioning tests. In the designed device, a relay element, driven by an e...
Article
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For the retinal blood vessels segmentation, we used a method, which is based on the morphological operations. The output of this process is extracted retinal binary image, where is situated main blood vessels. In this paper is used dataset of images (2800 images) from device RetCam3. Before applying the image processing, it was selected 30 images w...
Article
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In the Czech Republic, the medical device industry is an important sector with a strong tradition and has high added value and perspectives in demand under changing demographic and social structures. The aim of this article is to describe and analyze the complex issues of the new European Commission Medical Device Regulation (MDR) 2017/745 from the...
Article
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The subject of the work was the experimental verification of the negative influence of gravity sets in a pressure volumetric infusion pump with an impact on the accuracy of infusion solution dosing. The quality criterion for gravity sets was the accuracy of the flow versus the reference set by the volumetric infusion pump. The solution consisted of...
Chapter
Full-text available
The paper describes the implementation of non-hierarchical methods k-means and fuzzy c-means on nosily images from different medical modalities as computed tomography and magnetic resonance. Modern devices are created on the basis of advanced technology, both during the actual acquisition of the image and subsequently during its processing. The pro...
Chapter
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Image processing plays a key role in many medical imaging applications, by automation and making delineation of regions of interest more simple. The paper describes image processing such as image properties, noise generators and edge detectors. The work deals with methods of edge detection in biomedical images using real data sets. The aim of this...
Chapter
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Despite knowing the electrogastrography (EGG) for many years, there are still open issues regarding its measurement and processing. In the comparison with other electrophysiological signals, like is electrocardiography (ECG), we still miss a unified scheme for the placement of electrodes and EGG evaluation. In this paper, we analyze the possibiliti...
Article
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The development of a new product is essential for the progress and success of any company. The medical device market is very specific, which is challenging. Therefore, this paper assesses an economic model for medical device evaluation using the economic, health, technology regulatory, and present market knowledge to enable the cost–time conception...
Chapter
This paper deals with the analysis and modeling of the retinal blood vessels system. The aim of the analysis is the design and implementation of a fully automated segmentation model based on the morphological segmentation, allowing for extraction of the blood system area within the binary model, where other retinal structures are suppressed. An imp...
Article
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This paper presents a newly-designed and realized Invasive Blood Pressure (IBP) device for the simulation on patient's monitors. This device shows improvements and presents extended features with respect to a first prototype presented by the authors and similar systems available in the state-of-the-art. A peculiarity of the presented device is that...
Article
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The Business Process Model to represent the process of developing a medical device is presented in this paper. In the age of population aging and a growing amount of patients, enormous pressure is put on improving their care and living conditions. The development of medical devices is a complicated and expensive process. Therefore, the whole proces...
Conference Paper
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Knee cartilage segmentation has been challenging task for many years. This task is usually connected with two major issues. First object of interest is automatic detection and extraction of knee cartilage shape. Second important issue is detection of osteoarthritis, especially, in early stages. This early deterioration is badly recognizable from na...
Conference Paper
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Contemporary medical devices are a complex technical structure that involves complex of material-technological structures that are structurally linked to functional systems that are then in direct interaction with different levels of biological structures (nitrous tissue structures, hemocompatibility as a separate problem, skin surface, eye cornea...
Chapter
Nowadays, the use of X-ray is an important part of imaging techniques used in medicine. The resulting skiagraphy images are kept in the workplace and can be influenced by secondary radiation, which occurs as a secondary effect when irradiated with X-rays. This secondary radiance has not to effect only for the skiagraphy images but also for the huma...
Chapter
Alcohol detection is a challenging issue due to many aspects, especially to security reasons. Conventional measuring systems usually utilize a direct contact with the human body to obtain on spot alcohol level estimation. Nevertheless, it is well known that there are several side effects including the facial temperature distribution for alcohol det...
Chapter
In Smart Home Care (SHC) rooms from the measured operational and technical quantities for monitoring activities of every day of life for support of independent life for elderly people. The proposed algorithm for data processing (predicting the CO2 course using neural networks from the measured temperature indoor Ti (°C), temperature outdoor To (°C)...
Article
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Alcohol intoxication is a significant phenomenon, affecting many social areas, including work procedures or car driving. Alcohol causes certain side effects including changing the facial thermal distribution, which may enable the contactless identification and classification of alcohol-intoxicated people. We adopted a multiregional segmentation pro...
Article
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The paper examines the development and testing of an electro-pneumatic device for wound healing therapy after surgery in the neck area. The device generates air pressure values in a miniaturized cuff using electronic circuitry to drive an electro-valve and air compressor. The device works in two distinct modes: continuous pressure mode and pulsatin...
Chapter
In the nineties of the twentieth century, radiofrequency medical instruments were developed and used in abdominal and hepatic surgery. The author of many radiofrequency operating instruments and surgical techniques for use in hepatic surgery is Professor Nagy Habib, according to which these tools and methods are named. These techniques are followed...
Article
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Clinical retinal image analysis is an import aspect of clinical diagnosis in ophthalmology. Retinopathy of Prematurity (ROP) represents one of the most severe retinal disorders in prematurely born infants. One of the ROP clinical signs is the presence of retinal lesions endangering the vision system. Unfortunately, the stage and progress of these f...
Article
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One of the most challenging issues of the radiotherapy is a fixation of the movable cancer volumes by influence of breathing. A reliable fixation leads to reducing of ambient tissues damage. In this paper, we propose a measurement chain for a real-time telemetry recording of the breathing activity within the radiotherapy. During the CT radiotherapy...
Article
Full-text available
Biopotential electrodes are essential for measurements of biological signals. There are many different manufacturers and many different types of electrodes on the market. Essential parameters such as impedance, distortion and phase angle are often not disclosed by the manufacturer. This work presents a simple device that can be used to test electri...
Article
The Accuray CyberKnife® system provides radiotherapy for the treatment of moving lung tumors, thanks to the use of the Xsight® Lung Tracking technology for monitoring the motion of the target. However, there are situations in which this technology is not able to properly track the target. Thus, the aim of the proposed work is to study the accuracy...
Article
In radiation therapy, irradiation systems are focused to target using a CT scan. In the case of target which is moving by breathing, the CT scan is performed in the patient's inhale or exhale. However, ensuring that the patient is breathing same way as during the CT scan is really problematic. This project deals with the issue by using special resp...
Article
In this work, a commercial flexible thermoelectric generator (f-TEG) was used to harvest the body thermal energy during the execution of activities of daily living (ADL). The f-TEG was placed at the level of the ankle, and the performed activities were sitting at the desk and walking. In the first stage of measurements, tests were performed to choo...