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Perfusion Modelling in Optical Coherence Tomography
Štohanzlová, Petra ; Penhaker,, Marek (referee) ; Kudrna,, Petr (referee) ; Kolář, Radim (advisor)
This thesis deals mainly with perfusion modeling in optical coherence tomography (OCT). The introductory part deals with basic theory of the OCT, including a description of its basic applications. Part of the work was the testing of selected contrasting materials suitable for the OCT and the design and implementation of phantoms, which were subsequently used in the main part of the thesis. In the practical part, attention is paid to the perfusion analysis in the OCT, first the application of the dilution theory in the OCT for flow estimation, then a study testing the basic theory of perfusion on OCT by means of tissue phantom. Another part of the thesis is devoted to the method of speckle variance analysis for flow visualization.
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Ultrasound phantoms in medical diagnostics
Koňaříková, Anna ; Pekař, Miloslav (referee) ; Hurčíková, Andrea (advisor)
This bachelor’s thesis studied the relative ultrasonic velocity of gel matrices made of gelatine, agar or agarose depending on concentration and time. These properties have been studied both in the air and water environments, using high resolution ultrasonic spectroscopy. In additon, the basic properties of gel matrices, such as desiccation or moulding, were observed. Relative ultrasonic speed has been found to grow linearly with sample concentration and its changes over time are minimal. Basic gel matrices without added preservatives are able to withstand the usable state only for a week.
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Hydrogel fantoms in sono diagnostic
Koňaříková, Anna ; Jugl, Adam (referee) ; Hurčíková, Andrea (advisor)
As part of the practical part of this diploma thesis, an internship took place in the Danish company Dansk Phantom Service, which is engaged in the production of ultrasound phantoms. The purpose was to better understand the ultrasound devices used to characterize these phantoms. Part of the phantom material was provided for measurements on ultrasound devices occuring at the faculty of chemistry of BUT to compare results provided by these devices. The follow-up task was to put into operation a digital oscilloscope, which is used to characterize phantoms, and to create a standart operating procedure. Furthermore, the material of the american company Humimic Medical was characterized and the possibilities of its use for the requirements of the Phillips company were assessed, with the subsequent addition of carbon fibers to the material for the modification of phantom properties. The possibility of preparing a viscous phantom from a mixture of agar, glycerol and water with subsequent charakterization of experimental samples was also investigated. It was found that the values from different ultrasound devices are comparable, differing only in small deviations. Humimic’s Medical material has potencial for specific applications, as does carbon fiber for property modification. A basic mixture of viscous phantom was created that would potentially meet the requirements. However, this basic mixture need to be further modified.
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Ultrasound phantoms in medical diagnostics
Koňaříková, Anna ; Pekař, Miloslav (referee) ; Hurčíková, Andrea (advisor)
This bachelor’s thesis studied the relative ultrasonic velocity of gel matrices made of gelatine, agar or agarose depending on concentration and time. These properties have been studied both in the air and water environments, using high resolution ultrasonic spectroscopy. In additon, the basic properties of gel matrices, such as desiccation or moulding, were observed. Relative ultrasonic speed has been found to grow linearly with sample concentration and its changes over time are minimal. Basic gel matrices without added preservatives are able to withstand the usable state only for a week.
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Perfusion Modelling in Optical Coherence Tomography
Štohanzlová, Petra ; Penhaker,, Marek (referee) ; Kudrna,, Petr (referee) ; Kolář, Radim (advisor)
This thesis deals mainly with perfusion modeling in optical coherence tomography (OCT). The introductory part deals with basic theory of the OCT, including a description of its basic applications. Part of the work was the testing of selected contrasting materials suitable for the OCT and the design and implementation of phantoms, which were subsequently used in the main part of the thesis. In the practical part, attention is paid to the perfusion analysis in the OCT, first the application of the dilution theory in the OCT for flow estimation, then a study testing the basic theory of perfusion on OCT by means of tissue phantom. Another part of the thesis is devoted to the method of speckle variance analysis for flow visualization.
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