1. A method of imaging a target, comprising the steps of: (a) acquiring an echo sequence image of the target; (b) computing a log spectrum of at least a portion of said echo sequence image; (c) computing a low-resolution shift-invariant wavelet projection of said log spectrum; (d) estimating a point spread function from said low-resolution wavelet projection; and (e) deconvolving said at least portion of said echo sequence image with said point spread function.