Schematic overview of the KWIC filter. a. A radial k-space sampling pattern shown below its DCF along one radial line. The DCF is used to weigh the k-space points. b. Three similar k-spaces that share their periphery through the KWIC filter, thus increasing the local sampling density and decreasing the local weight attributed by the DCF. The radii outside of which data were added were defined through the Nyquist criterion. c. An undersampled KWIC-filtered k-space. While the number of lines has decreased, the periphery of k-space still has a higher sampling density than the standard radial k-space in a.