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Properties measurement of ultrasound system in ophthalmology
Grebíková, Lucie ; Mézl, Martin (referee) ; Harabiš, Vratislav (advisor)
The thesis deals with physical principles of ultrasound with following specialization on ophtalmic ultrasound system Nidek Echoscan 4000 and its properties. And also it deals with description of investigative techniques in ophthalmology (A-mode, B-mode, biometry and pachymetry). Next, they was suggested procedures of measurement and that is spatial resolution (axial and lateral spatial resolution) and propagation speed of ultrasound depending on the temperature. Then these properties was tested on laboratory phantoms of eye – ETETECH LTD. and Multipurpose Ultrasound Phantom but on created phantoms of eye too, which will be made from agarose gel with build-in materail (fishing line, plastic film, plastic bag and rubber). At the end, measured values was processed in the generated program.
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Speckle noise suppression methods in ultrasound images
Tvarůžek, Marek ; Harabiš, Vratislav (referee) ; Mézl, Martin (advisor)
This diploma thesis deals with the methods of despeckling in ultrasound images. Ultrasound imaging and related artifacts are described in more details. Ultrasound imaging has its pros and cons, where speckle noise is a disadvantage to be solved. Models of origin of this specific noise are referred too. Practical part of this thesis aims on filtering speckled images by basic and advanced filtering methods as are linear filtering, median filtering, application of Frost filter, QGDCT, geometric filtering, anisotropic diffusion filtering and filtering based on wavelet transformation. Results are compared on the basis of objective criteria.
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Measurement of thickness of skin and subcutaneous tissue in B-mode ultrasound image
Moldříková, Zuzana ; Štohanzlová, Petra (referee) ; Šrámek, Jaromír (advisor)
In the first part this bachelor thesis deals with theoretical analysis of terms, which are needed for understanding and algorithm proposition for skin thickness and subcutaneous tissue direct measurement. Second part of this thesis deals with implementation of algorithm. In six chapters there are described terms like skin and subcutaneous tissue, adiposity, Body Composition Analysis, ultrasound, B-mode and basics of image processing, which are going to be needed for processing of ultrasound image and algorithm creation. Chapter seven includes description of algorithm implementation and description of its structure. There is also analyzed clinical verification of functionality on phantom and some volunteers. The chapter is concluded with evaluation and discussion of gained results.
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Dynamic Focusing in Ultrasound Tomography
Kratochvíla, Jiří ; Roleček, Jiří (referee) ; Jiřík, Radovan (advisor)
The aim of the master’s thesis, is to get acquainted with the dynamic focusing in conventional ultrasound systems, to modify this method for ultrasound computer tomography and to realize and interpret this modification on simulated and real data in a transparent graphic interface. The modification of the dynamic focusing was executed for the 3D ultrasound computer tomograph developed in Karlsruhe. Simulated data, that are necessary for focusing, were generated by existing program, which was adjusted. The new created program of the dynamic focusing was tested and evaluated with those simulated and real data.
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Processing of Ultrasound Radiofrequency Data
Krchňavý, Jan ; Čížek, Martin (referee) ; Jiřík, Radovan (advisor)
The main aim of the semestral work was to get to know with processing of ultrasound radio-frequency. It’s theoretical subscription, subscription of physical principle, each types of imaging, types of measuring probes, followed by practical processing acquired ultrasound data in program Matlab. Making of working algorithm, which can present IQ DATA form ultrasound probe into visual elements. Because of measuring ultrasound data with sector probe, it was necessary to use conversion of cartesian coordinates to polar coordinates. Graphical interface was created in GUI of Matlab. Within interface the parameters of imaging can be easily set. Dynamic sequences can be also displayed.
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Measurement of thickness of skin and subcutaneous tissue in B-mode ultrasound image
Moldříková, Zuzana ; Štohanzlová, Petra (referee) ; Šrámek, Jaromír (advisor)
In the first part this bachelor thesis deals with theoretical analysis of terms, which are needed for understanding and algorithm proposition for skin thickness and subcutaneous tissue direct measurement. Second part of this thesis deals with implementation of algorithm. In six chapters there are described terms like skin and subcutaneous tissue, adiposity, Body Composition Analysis, ultrasound, B-mode and basics of image processing, which are going to be needed for processing of ultrasound image and algorithm creation. Chapter seven includes description of algorithm implementation and description of its structure. There is also analyzed clinical verification of functionality on phantom and some volunteers. The chapter is concluded with evaluation and discussion of gained results.
|
|
|
Processing of Ultrasound Radiofrequency Data
Krchňavý, Jan ; Čížek, Martin (referee) ; Jiřík, Radovan (advisor)
The main aim of the semestral work was to get to know with processing of ultrasound radio-frequency. It’s theoretical subscription, subscription of physical principle, each types of imaging, types of measuring probes, followed by practical processing acquired ultrasound data in program Matlab. Making of working algorithm, which can present IQ DATA form ultrasound probe into visual elements. Because of measuring ultrasound data with sector probe, it was necessary to use conversion of cartesian coordinates to polar coordinates. Graphical interface was created in GUI of Matlab. Within interface the parameters of imaging can be easily set. Dynamic sequences can be also displayed.
|
|
|
Properties measurement of ultrasound system in ophthalmology
Grebíková, Lucie ; Mézl, Martin (referee) ; Harabiš, Vratislav (advisor)
The thesis deals with physical principles of ultrasound with following specialization on ophtalmic ultrasound system Nidek Echoscan 4000 and its properties. And also it deals with description of investigative techniques in ophthalmology (A-mode, B-mode, biometry and pachymetry). Next, they was suggested procedures of measurement and that is spatial resolution (axial and lateral spatial resolution) and propagation speed of ultrasound depending on the temperature. Then these properties was tested on laboratory phantoms of eye – ETETECH LTD. and Multipurpose Ultrasound Phantom but on created phantoms of eye too, which will be made from agarose gel with build-in materail (fishing line, plastic film, plastic bag and rubber). At the end, measured values was processed in the generated program.
|
|
|
Speckle noise suppression methods in ultrasound images
Tvarůžek, Marek ; Harabiš, Vratislav (referee) ; Mézl, Martin (advisor)
This diploma thesis deals with the methods of despeckling in ultrasound images. Ultrasound imaging and related artifacts are described in more details. Ultrasound imaging has its pros and cons, where speckle noise is a disadvantage to be solved. Models of origin of this specific noise are referred too. Practical part of this thesis aims on filtering speckled images by basic and advanced filtering methods as are linear filtering, median filtering, application of Frost filter, QGDCT, geometric filtering, anisotropic diffusion filtering and filtering based on wavelet transformation. Results are compared on the basis of objective criteria.
|
|
|
Dynamic Focusing in Ultrasound Tomography
Kratochvíla, Jiří ; Roleček, Jiří (referee) ; Jiřík, Radovan (advisor)
The aim of the master’s thesis, is to get acquainted with the dynamic focusing in conventional ultrasound systems, to modify this method for ultrasound computer tomography and to realize and interpret this modification on simulated and real data in a transparent graphic interface. The modification of the dynamic focusing was executed for the 3D ultrasound computer tomograph developed in Karlsruhe. Simulated data, that are necessary for focusing, were generated by existing program, which was adjusted. The new created program of the dynamic focusing was tested and evaluated with those simulated and real data.
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