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Projection and projection-reconstruction x-ray imaging process simulation
Fiala, Petr ; Jiřík, Radovan (referee) ; Drastich, Aleš (advisor)
The work deals with physical principles of X-ray generation and development of image during projection and projection reconstruction. A proposal of user’s application in a Matlab – Guide is given, which can be used as a laboratory exercise of the simulation of the projection- and projection image reconstruction. The computer program involves an evaluation of a X-ray quality of CT RTG ZS – quantitative assessment of spatial resolution and as well as the acquisition contrast as a function on an object size. The main aim of the work was the comparison of the acquisition contrast at various acquisition projection and projection-reconstruction parameters. Also, the work is illustrated by some results achieved.
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X-ray computed tomography artifacts simulation
Koťová, Markéta ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The bachelor's thesis deals with CT artifacts modeling generated during the acquisition process. The theoretical part summarizes principles of CT and origin of artifacts. The practical part consists of a newly developed simulator, which includes ring, motion, metal, streak and aliasing artifacts. Finally, the new laboratory exercise was designed.
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Detection of the RF Signal on MRI
Břínek, Adam ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
Presented bachelor’s thesis is focused on the detection of MR signal. The aim is to propose the laboratory exercise. The difference between the linear and quadrature detections is described with emphasis on SNR. The program was created in Matlab GUI to be provided in the laboratory excercise. The program is presented in the text.
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Acquisition and Detection Geometry of the CT X-ray Imaging Process
Rusz, Jakub ; Harabiš, Vratislav (referee) ; Drastich, Aleš (advisor)
The basic components of acquisition and detection geometry of a 3rd generation single slice CT scanner are described here. Then the high contrast spatial resolution of the imaging process is explained and what effects does the setting of acquisition and detection geometry changes in the limiting high contrast spatial resolution. At the end a laboratory exercise and a simulator is presented, which will show and explain these effects.
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X-ray computed tomography fluoroscopy simulation
Bainar, Petr ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The aim of this thesis is to create simulator of image reconstruction during x-ray computed tomography fluoroscopy. Simulator will be put to use in laboratory exercises concerning imaging systems. Introductory part is focused on description of x-ray CT imaging process. Emphasis is placed especially on specific fluoroscopic reconstruction algorithms. In following part of thesis, the concept of simulator is analyzed-its inputs and outputs are declared and user’s operation is sketched out. Consequently, appearance and controls of realized simulator are described in detail. In evaluative part of thesis, achieved findings are documented. Influence of process parameters on acquired images is described, in this part. Consequently, optimal preferences finding method is suggested. Manual for laboratory exercise is attached.
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Binocular vision
Ambros, Martin ; Drastich, Aleš (referee) ; Fedra, Petr (advisor)
This bachelor’s thesis deals with the physiology of binocular vision for the acquisition of spatial effect from two-dimensional images passive and active technologies. At the beginning is described physiology of the human sight and binocular vision with his ontogeny in childhood. Next section is devoted to history and main stereoscopic technology like anaglyph, INFITEC, technology using polarization light, shutter glasses, head mounted display, autostereoscopic displays and their combination. Further it describes procedure by proposal of scanning dynamic scene by the help of two identic videorecorders. In the last part of this work is described implementation of scanning dynamic scene, processing in a program Matlab and results of subjective classification by group of observers.
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Digital radiography- image processing simulation
Lamoš, Martin ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
This paper describes a MATLAB application with the main purpose of the simulation of noise components and noise elimination methods of Digital Radiography. The main parts of simulator are the model of a scene, procedures for loading the noise components to image data and methods for image processing. Various methods are employed depending on the type of noise. Subtraction techniques are used for the elimination of structural noise. The physical noise suppression is obtained using several methods of cumulation and Pixel Shift is used to reduce motion artifacts caused by the existence of moving noise. The techniques of superposition highlight the areas of interest in an image. Included are also auxiliary procedures for simulator running and presentation of final data. The model and the presented application can be used mainly for educational purposes as a powerful didactic tool.
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Measurement of quality of gamma-cameras
Awadová, Thuraya ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The topic of this bachelor thesis is the measurement of the gamma cameras’ quality. First, we will focus on the general methodology of imaging in gamma-imaging systems, on the particular types of constructions and technical parameters influencing the resulting imaging quality. In the practical part of the thesis we will pay attention to the methodology of measurement of particular technical parameters within planar or SPECT gamma cameras in a planar mode and their realisation at the Clinic of Nuclear Medicine, Faculty Hospital Brno. The measurement follows the recommendations of the State Office for Nuclear Safety and of the particular gamma camera producer. In conclusion, the stability of a particular quantitative parameter will be evaluated.
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Calculation of efficient dose rtg diagnostic irradiation
Bažantová, Lucie ; Drastich, Aleš (referee) ; Rozman, Jiří (advisor)
This bachelor thesis deals primarily with the theory of ionizing radiation and its interaction with matter. It deals particularly with x-radiation and the methods of its use in medicine. The thesis contains a description of the origin of the x-ray image and a description of the techniques of radiography and skiascopy. A list of quantities and units used in radiation physics and in radiation protection has been set out, with regard to assessing the risk involved in the interaction of x-radiation with an organism. In particular, the effective dose and the methods of evaluating this during medical irradiation have been set out. The main parts of the work are an overview of the software environment used in radiation physics and an example of the calculation of an effective dose for a concrete radiographic examination together with a detailed description of the method of calculation. At the end of the thesis there is a table of calculated values and an evaluation of them.
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X-ray projection imaging- model of structural noise suppression
Lamoš, Martin ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The aim of this task is to create a program that will simulate noise components and methods of their elimination for X-ray projection imaging with focus on structural noise. MATLAB has chosen as the environment for the implementation. Some of the toolboxes shipped with MATLAB has also been used, mainly the Image Processing Toolbox. The methods and elements are implemented as independent functions, which are highly configurable through the setting of the input parameters. All of functions are covered in a custom application. The model is become user friendly and it is suitable teaching support as a laboratory task. The methods it is possible to use for the structural noise suppression are: temporal image subtraction, temporal integration, matched filtration and recursive filtration. There are three methods of cumulation for physical noise suppression. With proper settings it is possible to suppress also the periodical motional noise suppression.
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