The PhD defence and trial lecture will be streamed. The chair of the defence will moderate the disputation.
Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions.
Streaming - disputation and trial lecture:
Request a digital copy of the thesis
Trial lecture
Time and place: Nov 19, 2021 10:15 AM, Lille Fysiske auditorium
Title: “Artificial intelligence in radiological image quality: current role and future perspectives”
Main research findings
- X-ray imaging is essential for medical diagnostics, image-guided surgery and interventional procedures. X-rays are ionizing radiation that may cause harm, and exposure is associated with increased risk of cancer and skin injuries. Excessive radiation doses may be due to system failure or incorrect use.
The thesis presents new methods for optimization and quality control of X-ray systems. A method for assessing the use of an anti- scatter grid considering all parameters affecting grid performance was developed, where 2D mapping of the signal-to-noise ratio improvement factor proved useful to adapt recommendation for grid application at each system.
Image quality was evaluated using a contrast-detail phantom. It was found that it’s not expected to reliably detect dose variations smaller than 50%.
To keep the X-ray dose low in fluoroscopic imaging, it is common to perform image averaging. A method to determine the level of averaging applied by the system was developed, along with a method to determine the dose delivered to the patient by doing automatic exposure control of the X-ray system.
The new methods are useful to optimize grid application, and compare images and doses within and between systems from different vendors.
Candidate contact information
Phone number: 41625220
Adjudication Committee
- Dr. Erik Tesselaar, Linköping University Hospital, Sweeden
- Professor Hilde Olerud, University of South-Eastern Norway
- Professor Ørjan G. Martinsen, University of Oslo, Norway
Supervisors
- Professor Eirik Malinen, University of Oslo, Norway
- Professor Magnus Båthn, Sahlgrenska University Hospital/University of Gothenburg, Sweden
Chair of defence
- Head of Department Susanne Viefers, Department of Physics, University of Oslo, Norway
Contact information to Department: Line Trosterud Resvold