Sökning: "Cathrine Jonsson"

Hittade 4 avhandlingar innehållade orden Cathrine Jonsson.

  1. 1. Advances in quantitative emission tomography : development and analysis of methods for validation and correction

    Författare :Cathrine Jonsson; Magnus Dahlbom; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SPECT; Quantification; rCBF; Scatter correction; Phantoms; medicinsk strålningsfysik; Medical Radiation Physics;

    Sammanfattning : The nuclear medicine imaging techniques SPECT and PET are sensitive tools in mapping various physiological and biochemical processes in vivo. This work was devoted to investigations of methodological and physical properties of the SPECT technique as well as developing methods for validation and correction. LÄS MER

  3. 2. Online Sexual Behaviours Among Swedish Youth : Characteristics, Associations and Consequences

    Författare :Linda S. Jonsson; Carl Göran Svedin; Margareta Hydén; Cathrine Hamilton-­Giachritsis; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Online; Internet; sexual behaviour; selling sex; sexting; youth; adolescents;

    Sammanfattning : Online sexual behaviours refer to sexual activities where the Internet and/or mobile phone are used. The aims of this thesis were to investigate young people and their experiences of different online sexual behaviours with regard to characteristics, associations and consequences, by using data from a representative sample of 3,503 Swedish youth (m= 18. LÄS MER

  4. 3. Out-of-field doses from proton therapy and doses from CBCT imaging : Risk of radiation-induced second cancer from modern radiotherapy

    Författare :Oscar Ardenfors; Irena Gudowska; Alexandru Dasu; Cathrine Jonsson; Pawel Olko; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Medical Radiation Physics; medicinsk strålningsfysik;

    Sammanfattning : The use of ionizing radiation for treatment of cancer diseases is continuously increasing as patient survival is improving and new treatment techniques are emerging. While this development is beneficial for curing primary tumors, concerns have been raised regarding the unwanted dose contribution to healthy tissues of patients and the associated risk of radiation-induced second cancer (RISC). LÄS MER

  5. 4. Verification of high energy photon therapy based on PET/CT imaging of photonuclear reactions

    Författare :Sara Janek Strååt; Anders Brahme; Cathrine Jonsson; Iuliana Dasu; Sibylle Ziegler; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photonuclear reactions; PET CT treatment verification; High-energy photon therapy; Medical Radiation Physics; medicinsk strålningsfysik;

    Sammanfattning : For classical and intensity modulated radiation therapy of deep-seated tumors, high-energy photons are the optimal radiation modality from an integral dose point of view. By using narrow scanned beams the treatment outcome can be improved substantially by delivering biologically optimized intensity modulated distributions often with sharp dose gradients. LÄS MER