National Repository of Grey Literature 149 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Anatomy based landmark detection in brain CT scans
Krajčiová, Alexandra ; Harabiš, Vratislav (referee) ; Jakubíček, Roman (advisor)
Manual detection of anatomical landmarks from head CT (Computed Tomography) scans is time-consuming task prone to observer errors. In addition, the accuracy of the detection correlates with image quality. The aim of this work is to create an algorithm that will perform automatic detection of anatomical landmarks. These landmarks can be later used to form radiological lines, which finds its application in CT scanning. SVM (Support Vector Machines) and HOG (Histograms of Oriented Gradients) features was chosen for anatomical landmark detection. The achieved results, possibilities of further progress and improvement of detection are summarized in the conclusion.
Image interpolation methods in radiological diagnosis
Santarius, Paweł ; Jakubíček, Roman (referee) ; Harabiš, Vratislav (advisor)
This bachelor thesis is focused on interpolation algorithms used in diagnostic radiology in DICOM format and also discribes DICOM format and PACS system to a reader. Bicubic, bilinear and nearest neighbour algorithms are used to display interpolated images. Results are objectivly a subjectivly evaluated by a team of professional radiologists.
Detection of source code plagiarism
Bláhová, Barbora ; Harabiš, Vratislav (referee) ; Kašpar, Jakub (advisor)
The purpose of this thesis is to introduce the matters of plagiarism of source codes and to suggest methods, that will be used to create the original plagiarism detector. Theoretical part of the thesis states the definitions and the most common methods of plagiarism, both in general and in source codes. Furthermore it presents already existing types of the detectors and states principals, according to which the detection can be performed. Practical part deals with implementation of detecton and it´s testing.
Airway analysis of prematurely born babies based on X-ray CT and MRI scans
Lázňovský, Jakub ; Harabiš, Vratislav (referee) ; Chmelík, Jiří (advisor)
Předkládaná Diplomová práce se zabývá analýzou a tvorbou modelů dýchacích cest předčasně narozených dětí. Nejprve je položen teoretický základ v oblasti vývoje dýchacího ústrojí a tvorby modelů dýchacích cest. Poté jsou představeny využité zobrazovací modality a popsány metody pro práci s obrazovými daty. Praktická část práce se zabývá vytvořením modelů dýchacích cest tří novorozenců. Všechny tyto modely jsou vytvořeny na základě klinických CT a MRI dat novorozenců narozených ve 30. týdnu gestačního věku. U těchto vytvořených modelů jsou dále analyzovány vybrané parametry související s anatomickou strukturou dýchacích cest. Na základě analýzy těchto parametrů byl následně navrhnut reprezentativní model, odpovídající dýchacím cestám novorozence daného gestačního věku.
Automatic smoothing 3D models of cranial embryonic mouse cartilage
Kočendová, Kateřina ; Harabiš, Vratislav (referee) ; Jakubíček, Roman (advisor)
The focus of this thesis is the smoothing of manually segmented 3D models of mouse embryo craniofacial cartilege. During the process of manual segmentation, artefacts and other imperfections appear in the final models and need to be repaired. Firstly, manual segmentation is corrected using gradients and thresholding. Subsequent smoothing methods are constructed based on theoretical research. Algorithmizing is executed in the MATLAB environment. All the designed algorithms are then tested on selected models. Statistical evaluation is determined using the Srensen–Dice coefficient, where manually smoothened models cleared of all artefacts are used as the gold standard.
Active upper limb prosthesis
Brázdil, Štěpán ; Sekora, Jiří (referee) ; Harabiš, Vratislav (advisor)
This thesis focuses on the field of prosthetics, especially the issue of active prosthesis control. The goal is to perform a comprehensive analysis, design and construction of a prosthetic system that, based on the analysis of sensory data (such as an EMG signal from multiple channels), can correctly classify a gesture and a subsequent moving of the limb model. The first parts of the thesis are an important description of the critical components and important parameters of the active prosthesis system, including comparison and selection of available open source solutions. Next is a proposal of interconnection and description of individual hardware and software components. It also includes documentation of the real constructed system, which consists of the InMoov robotic hand, the Raspberry Pi controller and accessories. The results are critically evaluated in the last part of this work.
Active prostetic hand
Brenner, Maximilian ; Sekora, Jiří (referee) ; Harabiš, Vratislav (advisor)
BACKGROUND: Based on mainly vascular diseases and traumatic injuries, around 40,000 upper limb amputations are performed annually worldwide. The affected persons are strongly impaired in their physical abilities by such an intervention. Through myoelectric prostheses, affected persons are able to recover some of their abilities. METHODS: In order to control such prostheses, a system is to be developed by which electromyographic (EMG) measurements on the upper extremities can be carried out. The data obtained in this way should then be processed to recognize different gestures. These EMG measurements are to be performed by means of a suitable microcontroller and afterwards processed and classified by adequate software. Finally, a model or prototype of a hand is to be created, which is controlled by means of the acquired data. RESULTS: The signals from the upper extremities were picked up by four MyoWare sensors and transmitted to a computer via an Arduino Uno microcontroller. The Signals were processed in quantized time windows using Matlab. By means of a neural network, the gestures were recognized and displayed both graphically and by a prosthesis. The achieved recognition rate was up to 87% across all gestures. CONCLUSION: With an increasing number of gestures to be detected, the functionality of a neural network exceeds that of any fuzzy logic concerning classification accuracy. The recognition rates fluctuated between the individual gestures. This indicates that further fine tuning is needed to better train the classification software. However, it demonstrated that relatively cheap hardware can be used to create a control system for upper extremity prostheses.
Transitional motion analysis of the optically trapped particle in under-damped regime
Sűsserová, Martina ; Damková, Jana (referee) ; Harabiš, Vratislav (advisor)
The bachelor thesis deals with the analysis of the movement of optically trapped nanoparticles at low pressures and familiarizes with methods commonly used in these conditions. The practical part of this work was done in Matlab, where the undesirable signal interference was filtered out from the original data and their influence on the phase portraits of the acquired transients was analyzed. Furthermore, the damped oscillator parameters are obtained from the records of average trajectories and the distribution of position data during the transient compared with distribution of position data at stationary state by histograms.
Multifunctional monitoring belt
Dítě, Martin ; Milek, Jakub (referee) ; Harabiš, Vratislav (advisor)
The aim of this thesis is to develop a wireless monitoring belt based on literature review. The belt will be capable of scanning heart rate, respiratory rate, body temperature, motion, position, and falling of the user. Another aim is to also design a software for data reception and analysis focusing on pulse, respiratory rate, and temperature alarms.
MRI compatible optic fiber thermometer
Stibůrek, Miroslav ; Čučka, Milan (referee) ; Harabiš, Vratislav (advisor)
The following work deals with basics of fiber optics, history of fiber optics, and methods of measuring physical quantities with the use of fiber optic sensors. The work includes facts about physics, chemistry and biology - these elements are necessary for a full understanding of the issue. In order to create an optical fiber temperature sensor based on Fabry Perot resonator principle, several methods of manufacturing the optical cavity are investigated. A practical part of paper consist in the manufacturing of the miniature fiber thermometer, its coating and testing.

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