Sökning: "Phase-contrast"

Visar resultat 21 - 25 av 66 avhandlingar innehållade ordet Phase-contrast.

  1. 21. Towards High-Throughput Phenotypic and Systemic Profiling of in vitro Growing Cell Populations using Label-Free Microscopy and Spectroscopy : Applications in Cancer Pharmacology

    Författare :Obaid Aftab; Mats Gustafsson; Neil Carragher; Uppsala universitet; []
    Nyckelord :label free vesicle detector; high-throughput; phase contrast microscopy; Library of Pharmacologically Active Compounds; High Content Screening; fluorometric microculture cytotoxicity assay; nuclear magnetic resonance; mass spectrometry;

    Sammanfattning : Modern techniques like automated microscopy and spectroscopy now make it possible to study quantitatively, across multiple phenotypic and molecular parameters, how cell populations are affected by different treatments and/or environmental disturbances. As the technology development at the instrument level often is ahead of the data analytical tools and the scientific questions, there is a large and growing need for computational algorithms enabling desired data analysis. LÄS MER

  3. 22. Volumetric MRI measurements of velocity and flow - Accuracy, visualisation and technical improvements

    Författare :Anders Nilsson; Lund Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MRI; 4D flow; phase contrast MRI; velocity mapping;

    Sammanfattning : In the last two decades, phase-contrast magnetic resonance imaging (PC-MRI) has evolved from two-dimensional velocity and flow measurements to volumetric, time-resolved depictions of velocity fields (4D PC). The acquisition of time-resolved velocity fields allows flow visualisations that might provide better understanding of the dynamics of the cardiac system. LÄS MER

  4. 23. Applications of Laser-Plasma Acceleration

    Författare :Kristoffer Svendsen; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser wakefield acceleration; betatron radiation; X-rays; X-ray imaging; phase-contrast imaging; VHEE; radiotherapy; radiography; fuel injector; tomography; beam focusing; atomizing sprays; nanowires; liquid mass; target normal sheath acceleration; applications; charged particles;

    Sammanfattning : This thesis is dedicated to the investigation of laser-plasma particle acceleration concepts. Some of the work was focused on improving electron and proton acceleration for future applications, in terms of maximizing the particle energy and minimizing the divergence of the X-ray beams. LÄS MER

  5. 24. Evaluation of Intracranial Arteriovenous Malformations with Magnetic Resonance Imaging

    Författare :Maria Correia de Verdier; Johan Wikström; Elisabeth Ronne-Engström; Ljubisa Borota; Johan Wassélius; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Arteriovenous malformation; brain; proton-radiation therapy; magnetic resonance imaging; phase-contrast MRI; Radiology; Radiologi;

    Sammanfattning : Intracranial arteriovenous malformations (AVMs) are characterized by feeding arteries, a tangle of abnormal vessels (nidus) and draining veins. Radiological evaluation methods are used in diagnosing AVMs, treatment planning, post-treatment evaluation and monitoring stability. LÄS MER

  7. 25. Development and Applications of a Laser-Wakefield X-ray Source

    Författare :Isabel Gallardo Gonzalez; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser-wakefield acceleration; betatron radiation; ionization-induced trapping; direct laser acceleration; laser-wakefield merging; warm dense matter; phase-contrast imaging; Fysicumarkivet A:2018:Gallardo;

    Sammanfattning : In laser-wakefield acceleration (LWFA), a femtosecond laser pulse is tightly focused in a gas to intensities exceeding 1018 W/cm2 . The laser radiation ionizes the medium and excites a plasma wave that travels behind the laser pulse. LÄS MER