Wavelet depulsing of ultrasound echo sequences
AssigneeTechnion Research & Development Foundation Limited
InventorsDan Adam, Oleg Michailovich
Life of this patent
Estimating the term…
Abstract
A method and an associated apparatus for imaging a target. An echo sequence image of the target is acquired and a log spectrum of at least a portion of the echo sequence image is computed. A low-resolution, shift-invariant wavelet projection of the echo sequence log spectrum is used as an estimate of the log spectrum of the point spread function. A frequency domain phase of the point spread function also is estimated. The relevant portion of the echo sequence image is deconvolved using the estimated point spread function.
Claims11
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.
The method of claim l,wherein said computing is effected by steps including convolving said log spectrum with a sequence
- v[k]=2−M(ĥM[k]*hM[k])
- wherein k is a sample index, M is a resolution level index, hM is a discretized scaling function at resolution level M, and ĥM, is a mirror image of hM.
An apparatus for imaging a target, comprising:
- (a) a transducer for acquiring an echo sequence image of the target;
- and
- (b) a processor for:
- (i) computing a log spectrum of at least a portion of said echo sequence image,
- (ii) computing a low-resolution shift-invariant wavelet projection of said log spectrum,
- (iii) estimating a point spread function from said low-resolution wavelet projection, and
- (iv) deconvolving said at least portion of said echo sequence image with said point spread function.
Dependencies are inferred from the claim text.