A filter design method for minimizing ringing in a region of interest in MR spectroscopic images

Magnetic resonance spectroscopic imaging (MRSI) requires a relatively long time to sample k-space (the spatial frequency domain), effectively lowpass filtering the resulting reconstructed image. Ringing is especially problema tic when a region of interest (ROI) is close to a bright region outside the ROI, since the bright region tends to create a ringing artifact into the R OI due to the lowpass nature of the data, In this paper, we propose a metho d that reduces the effect of a stronger signal region on a weaker signal in a nearby ROI by designing a postprocessing filter that steers the strong i nterference away from the ROI, The proposed method is computationally simpl e both in the design stage and in applying it to images. We present experim ents that illustrate the value of the technique.