Patent ID: 8550998

Claim:
A method for suppression of pulse reverberation noise with measurement or imaging of a region of an object with elastic waves, the method comprising: a) at least two elastic wave pulse complexes are transmitted towards the region, where said pulse complexes are composed of a high frequency (HF) pulse in an HF hand and a low frequency (LF) pulse in an LF band, where the HF pulse is spatially so close to or overlaps the LF pulse so that the HF pulse observes a modification of the object by the LF pulse along at least a part of a propagation of the HF pulse, and where at least the transmitted LF pulse varies for each of the at least two transmitted pulse complexes where the LF pulse also can be zero in order to manipulate an object elasticity observed by the HF pulse, b) received HF signals are picked up by transducers from at least one of scattered and transmitted HF wave components from the at least two transmitted pulse complexes, where said received HF signals are subjected to a process to suppress pulse reverberation noise and to form measurement or image signals for display, and c) in the process to suppress the pulse reverberation noise and to form said measurement or image signals, at least one of said received HF signals is at least one of delay corrected with a correction delay in fast time or depth-time, pulse distortion corrected with a pulse distortion correction in the fast time, and amplitude corrected with an amplitude correction in the fast time, to form at least one corrected HF signal, said at least one corrected HF signal being further processed to form at least one noise suppressed HF signal with suppression of pulse reverberation noise.