Sökning: "Ionizing radiation"

Visar resultat 16 - 20 av 84 uppsatser innehållade orden Ionizing radiation.

  1. 16. Applicerbarhet av Scaled Reassigned Spectrogram for Transient Signals (ReSTS) på ultraljudssignaler från biologisk vävnad

    Kandidat-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

    Författare :Sara Florentsson; Anna Hollsten; [2022]
    Nyckelord :Ultrasound; resolution; biological tissue; signal processing; Technology and Engineering;

    Sammanfattning : The possibility of being able to examine the inside of the human body is the foundation of today’s medical diagnostics. This can be done through different imaging systems, where ultrasound is one of the most important imaging methods used. LÄS MER

  3. 17. Whole-body SAR measurements of 5G mmW base stations in a reverberation chamber

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Jens Eilers Bischoff; [2022]
    Nyckelord :Reverberation chamber; Whole body specific absorption rate; 5G; Absorption; Antenna measurements; Modväxlande kammare; Helkroppsbaserad specifik absorptionshastighet; SAR; 5G; Absorption; Antennmätningar;

    Sammanfattning : This study presents a method for measurement of whole-body average specific absorption rate (WBSAR) of a millimeter wave (mmWave) antenna in a reverberation chamber. The method takes advantage of multiple radiated power measurements to estimate the power absorbed in a phantom placed in front of the antenna. LÄS MER

  4. 18. Radiofrequency-Induced Heating of a Deep Brain Stimulator Lead inside TEM Cells and inside a 3T MR-Scanner

    Master-uppsats, Umeå universitet/Radiofysik

    Författare :Haider Shaban; [2022]
    Nyckelord :Medical Physics; MRI; ;

    Sammanfattning : The use of non-ionizing radiation in the magnetic resonance imaging (MRI) made it a safer diagnostic technique in comparison to the X-ray imaging method. MRI can also produce soft tissue images with a very high contrast without contrast agent which is another advantage that made MRI an important imaging technique for studying the mechanism of the deep brain stimulation (DBS) and for targeting the desired regions in the brain that should be stimulated. LÄS MER

  5. 19. DEVELOPMENT, VALIDATION AND APPLICATION OF A METHOD FOR DETERMINATION OF METABOLITE CONCENTRATIONS WITH PRECLINICAL MAGNETIC RESONANCE SPECTROSCOPY

    Master-uppsats,

    Författare :Lukas Lundholm; [2021-05-10]
    Nyckelord :Medical physics; Basis sets; Metabolites; Quantification; Animal study; MRS;

    Sammanfattning : Background: Information on the metabolic content in tissue has diagnostic and prognostic value when examining for example cancer and diseases of the brain. MR spectroscopy is a non-invasive method that allows quantification of metabolite concentrations in vivo, without the use of ionizing radiation, which makes the method highly attractive for both research and clinical applications. LÄS MER

  7. 20. FETAL DOSE ESTIMATION IN ABDOMINAL AND PELVIC CT EXAMINATIONS

    Master-uppsats,

    Författare :Olivia Carlstein; [2021-05-10]
    Nyckelord :Medical physics; Fetal dose; abdominal CT examination; pelvic CT examination; phantom measurement;

    Sammanfattning : Purpose: The purpose of this is study was to compare different methods for estimating the fetal dose, how much the different methods differ from each other and on which dose levels the fetal doses are estimated to. Theory: A radiological procedure should always be justified and in the case of a pregnant patient the justification should include both the mother and the fetus. LÄS MER