CAMPUS: A Catalytic Multiecho Phase Unwrapping Scheme

Wei Feng¹, Jaladhar Neelavalli¹, E. M. Haacke¹

Susceptibility weighted imaging (SWI) utilizes phase information at long echo time (TE). However, due to long TE, phase aliasing inevitably occurs. For the purpose of SWI, phase wraps can be removed by conventional region growing methods or homodyne filtering. Region growing phase unwrapping methods are not always reliable and conventional homodyne highpass filtering induces undesired artifacts. We propose a new pixel-wise catalytic multiecho phase unwrapping scheme (CAMPUS) that is not based on region growing and does not require filtering. It is suited for multiecho gradient echo imaging with short inter-echo spacing, which is exploited to unwrap the multiecho phase data.