Unraveling the structure of the electromagnetic field in MRI
Presently, the theory of image formation in Magnetic Resonance Imaging (MRI) is based on a so-called quasi-static field approximation of the radio frequency (RF) electromagnetic field. Such an approximation is accurate for MRI scanners operating with background fields up to about 1.5T, but may introduce artifacts as the strength of the static background field increases. The reason for this is that the frequency of the RF field is proportional to the strength of the background field and stronger background fields therefore result in a higher frequency of operation. Consequently, in high-field MRI the RF field can no longer be treated as quasi-static, since wave field effects come into play at these higher frequencies.
Project outside the universityLeiden University Medical Center (LUMC) and University Medical Center Utrecht (UMCU)
AssignmentIn this MSc project, you will investigate the structure of the RF electromagnetic field in high-field MRI scanners. You will develop a correction procedure that describes the RF field both in the transmit and receive state of the MRI scanner. In addition, you will perform measurements to verify the proposed correction mechanism and study the effects on MRI image formation.
RequirementsThe actual M.Sc. assignment will take place in consultation with the M.Sc. candidate. A solid background in mathematics and basic electromagnetics is required and knowledge of Matlab is preferred.
dr.ir. Rob Remis
Circuits and Systems Group
Department of Microelectronics
Last modified: 2014-09-26