Sökning: "radial imaging"

Visar resultat 1 - 5 av 37 avhandlingar innehållade orden radial imaging.

  1. 1. Magnetic resonance imaging with ultrashort echo time as a substitute for X-ray computed tomography

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Adam Johansson; Tufve Nyholm; Karlsson Mikael; James Balter; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic resonance imaging; computed tomography substitute; ultrashort echo time; parallel imaging; radial imaging; radiofysik; radiation physics;

    Sammanfattning : Radiotherapy dose calculations have evolved from simple factor based methods performed with pen and paper, into computationally intensive simulations based on Monte Carlo theory and energy deposition kernel convolution.Similarly, in the field of positron emission tomography (PET), attenuation correction, which was originally omitted entirely, is now a crucial component of any PET reconstruction algorithm. LÄS MER

  2. 2. Quality assurance for magnetic resonance imaging (MRI) in radiotherapy

    Detta är en avhandling från Umeå : Department of radiation sciences, Umeå university

    Författare :Mary Adjeiwaah; Tufve Nyholm; Rob HN Tijssen; [2017]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnetic resonance imaging; Radiotherapy; geometric distortions; patient-induced susceptibilities MR-only; radiofysik; radiation physics;

    Sammanfattning : Magnetic resonance imaging (MRI) utilizes the magnetic properties of tissues to generate image-forming signals. MRI has exquisite soft-tissue contrast and since tumors are mainly soft-tissues, it offers improved delineation of the target volume and nearby organs at risk. LÄS MER

  3. 3. Direct observation of biomolecule adsorption and spatial distribution of functional groups in chromatographic adsorbent particles

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anders Ljunglöf; Abraham Lenhoff; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biotechnology; Confocal microscopy; confocal Raman spectroscopy; protein adsorption; ligand distribution; visualization; imaging; Bioteknik; TECHNOLOGY Bioengineering; TEKNIKVETENSKAP Bioteknik; Surface Biotechnology; ytbioteknik;

    Sammanfattning : Confocal microscopy has been used as a tool for studying adsorption of biomolecules to individual chromatographic adsorbent particles. By coupling a fluorescent dye to protein molecules, their penetration into single adsorbent particles could be observed visually at different times during batch uptake. LÄS MER

  4. 4. The dynamic chromosphere Results and techniques with an observational approach

    Detta är en avhandling från Stockholm : Department of Astronomy, Stockholm University

    Författare :Carolina Robustini; Jorrit Leenaarts; Fernando Moreno Insertis; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sun; chromosphere; jets; sunspots; imaging; spectropolarimetry; Astronomy; astronomi;

    Sammanfattning : The chromosphere is a critical interface between the relatively cold photosphere and the hot corona. Its landscape is rich in very dynamic phenomena such as jets, spicules, and surges, which are thought to play an important role in the heating of the Sun’s upper atmosphere. LÄS MER

  5. 5. The right ventricle in volume or pressure overload Insights from novel imaging techniques

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Aleksandra Trzebiatowska-Krzynska; Eva Swahn; Niels Erik Nielsen; Lars Wallby; Marcus Carlsson; [2019]

    Sammanfattning : This study is inspired by the gap in knowledge regarding the timing of cardiac surgery and interventions in adult patients with congenital heart disease. There are many parameters used assessing right ventricular function; however, most of them have pitfalls. LÄS MER