Disputation: Ingrid Digernes
Doctoral candidate Ingrid Digernes at the Department of Physics, Faculty of Mathematics and Natural Sciences, is defending the thesis
"Mapping the vessel architecture of brain cancer by advanced perfusion MRI"
for the degree of Philosophiae Doctor.
Trial lecture - time and place
Conferral summary / Kreeringssammendrag
En ny MR-metode for avbildning av hjernekreft har blitt kartlagt. Ved bruk av simuleringsmodeller har avhandlingen avdekket at tidligere antatte forhold ved denne teknikken ikke stemmer. I tillegg viser avhandlingen hvordan denne MR-metoden kan brukes til å identifisere pasienter som er ekstra utsatt for vevsskade i hjernen etter høy-dose strålebehandling.
Main research findings / Hovedfunn
An important part of our understanding of brain tumours relies on our ability to assess the vascular function of the tumours. Dynamic susceptibility contrast (DSC), and the novel method Vessel Architectural Imaging (VAI), are MRI techniques that potentially can provide valuable information about the vascular properties of the brain.
This thesis investigates the behaviour of DSC and VAI under a range of different conditions using an advanced simulation model. The simulations show that the derived parameters from DSC and VAI are dependent on a complex interaction between underlying vascular properties and the noise in the signal. Moreover, results from the simulations suggest that previous findings regarding these techniques are not always valid. This thesis also demonstrates a clinical application of DSC and VAI. By examining vascular function of brain tumours receiving high-dose radiotherapy, we found that brain tumours with poor vascular function were more prone to radiation-induced tissue damage than tumours with normal vascular function.
The results from this work suggest that DSC and VAI can be clinically valuable, but must be used with caution. In addition, the results are highly relevant for further use and development of these techniques.