Sökning: "radiofrequency radiation"

Hittade 4 avhandlingar innehållade orden radiofrequency radiation.

  1. 1. Characterization of the MRI patient exposure environment and exposure assessment methods for magnetic fields in MRI scanners

    Författare :Jennifer Frankel; Jonna Wilén; Anders Garpebring; Johan Olsrud; Peter Lundberg; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; electromagnetic fields; exposure assessment; magnetic resonance imaging; switched gradient fields; radiofrequency fields; exposure metrics; radiofysik; radiation physics;

    Sammanfattning : Magnetic resonance imaging (MRI) has become one of the most common imaging modalities available in modern medicine, and it is an indispensable diagnostic tool thanks to the unparalleled soft-tissue contrast and high image resolution. It is also a unique exposure environment consisting of a complex mix of magnetic fields. LÄS MER

  3. 2. Contributions to quantitative dynamic contrast-enhanced MRI

    Författare :Anders Garpebring; Mikael Karlsson; Ronnie Wirestam; Nils Östlund; Jón Hauksson; Steven Sourbron; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dynamic contrast-enhanced MRI; quantitative imaging; parameter estimation; uncertainty estimation; arterial input function; radiofysik; radiation physics;

    Sammanfattning : Background: Dynamic contrast-enhanced MRI (DCE-MRI) has the potential to produce images of physiological quantities such as blood flow, blood vessel volume fraction, and blood vessel permeability. Such information is highly valuable, e.g., in oncology. LÄS MER

  4. 3. Mobile phone use and risk of intracranial tumors

    Författare :Stefan Lönn; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Acoustic neuroma; brain tumor; case-control study; epidemiology; intracranial tumor; mobile phone; radiofrequency radiation;

    Sammanfattning : Mobile phones are today an integral part of many people's lives in western societies. The phones emit radiofrequency radiation when being used. Concerns have been raised about possible effects that the exposure may have on the health of the mobile phone user. LÄS MER

  5. 4. Liver metastases from colorectal cancer

    Författare :Jennie Engstrand; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Introduction: Colorectal cancer (CRC) is the third most common cancer worldwide. At diagnosis of CRC 20-25% of patients have metastatic disease. The liver is the most common metastatic site and liver metastases are detected in 25-30% of all patients. LÄS MER