Method and apparatus for adaptive focusing in a medical ultrasou

Details Method and apparatus for adaptive focusing in a medical ultrasou Method and apparatus for adaptive focusing in a medical ultrasou

1987-08-19

1989-04-04

Jaworski, Francis J.

Surgery

Truss

Pad

73625, A61B 1000

Patent

active

048176141

ABSTRACT:
A sectional plane of the examination subject is first scanned by focused ultrasound transmission beams in an adaptation phase. Disturbing effects from the reflected echo signals which are caused by the inhomogenities in the tissue are thereby measured. In this adaptation phase, correction values for the delay time of the signals of the elemental transducers of the ultrasound array in comparison to the standard focusing are also derived from the measured values. In a following B-image imaging phase, the delay times of the active aperture are then varied dependent on the correction values during the emission and/or during reception. The disturbing effects are thereby compensated. A method and apparatus are disclosed which are especially well-suited for linear array systems and for patients having inhomogeneous tissues.

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