James R. Ledoux1, Tian Liu1, Jing Liu1, Ildar Khalidov1, Martin Prince1, Yi Wang1
1Weill Cornell Medical Center, New York, NY, United States
The reconstruction methods of Quantitative Susceptability Mapping (QSM), Susceptability Weighted Imaging (SWI), and truncated k-space division all desire to reveal an image of susceptability sources. It is difficult to directly find susceptability sources from the magnetic field map (obtained by phase information) as the dipole convolution kernel has zeros in k-space. However, the inversion problem can be regularized to provide a solution as shown in the QSM method. We compare this to direct inversion of the convolution by truncating the convolution kernel near ill-conditioned values, and with SWI which is a phase-masked T2* image.