Sökning: "Åsa Carlsson"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden Åsa Carlsson.

  1. 1. Dose Plan Optimization in HDR Brachytherapy using Penalties : Properties and Extensions

    Författare :Åsa Holm; Torbjörn Larsson; Åsa Carlsson Tedgren; Göran Sporre; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; MATHEMATICS; MATEMATIK;

    Sammanfattning : High dose-rate (HDR) brachytherapy is a specific type of radiotherapy used to treat tumours of for example the cervix, prostate, and breasts. In HDR brachytherapy applicators are implanted into or close to the tumour volume. A radioactive source is moved through these applicators and stops at certain positions, known as dwell points. LÄS MER

  2. 2. Mathematical Optimization of HDR Brachytherapy

    Författare :Åsa Holm; Torbjörn Larsson; Åsa Carlsson Tedgren; Jeroen Beliën; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : One out of eight deaths throughout the world is due to cancer. Developing new treatments and improving existing treatments is hence of major importance. In this thesis we have studied how mathematical optimization can be used to improve an existing treatment method: high-dose-rate (HDR) brachytherapy. LÄS MER

  3. 3. Lithium formate EPR dosimetry for accurate measurements of absorbed dose in radiotherapy

    Författare :Emelie Adolfsson; Åsa Carlsson Tedgren; Eva Lund; Håkan Gustafsson; Sara Olsson; Gudrun Alm Carlsson; Peter Sharpe; Linköpings universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : Lithium formate has shown to be a material with properties suitable for electron paramagnetic resonance (EPR) dosimetry, among them up to 7 times higher sensitivity compared to alanine, which is a well-established EPR detector material for dose determinations in radiotherapy.The aim of this thesis was to further investigate the properties of lithium formate and develop the dosimetry system towards applications in radiotherapy. LÄS MER

  4. 4. Susceptibility effects in MRI and 1H MRS. The spurious echo artifact and susceptibility measurements

    Författare :Åsa Carlsson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MRI; 1H MRS; susceptibility; spurious echo; artifact; artefact;

    Sammanfattning : When performing magnetic resonance (MR) experiments, a strong homogeneous magnetic field is often preferred, especially in clinical applications. However, all objects that are placed in the magnetic field will disturb the field homogeneity and cause local magnetic field gradients. LÄS MER

  5. 5. Beyond IT and Productivity : Effects of Digitized Information Flows in Grocery Distribution

    Författare :Åsa Horzella; Birger Rapp; Thomas Falk; Bo Carlsson; Maria Kollberg; Linköpings universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; IT; Productivity Paradox; Effects; Information Flows; Grocery Distribution; Supply Chain; Business and economics; Ekonomi; Economic Information Systems; Ekonomiska informationssystem; Information technology; productivity paradox; digitization; logging industry;

    Sammanfattning : During the last decades organizations have made large investments in Information Technology (IT). The effects of these investments have been studied in business and academic communities over the years. A large amount of research has been conducted on the relation between the investments in IT and productivity growth. LÄS MER