ZIP processing is a reconstruction option that uses zero-filling methods in k-space to interpolate the original data matrix from its acquired size to a higher spatial resolution data set in all three dimensions.

Substitution of zeroes for unmeasured data points in order to increase the matrix size of the new data prior to Fourier transformation of MR data. This can be equivalent to performing an interpolation (ZIP - zero fill interpolation processing) in the transformed data, resulting in pixels smaller than the actual resolution of the image.