| 摘要 |
In an exemplary embodiment, an examination object is scanned line-by-line with an ultrasonic beam and the developing echo signals are correspondingly recorded line-by-line on an image recording installation to form a visible image. The echo recording is to ensue amplitude-compressed without a simultaneous deterioration of the resolution or of the image sharpness. To this end, a preselectable plurality of echo lines (Zn through Zn+3) which preferably determine the breadth of a surround field for echoes to be depicted together with a current line (Zn+4) are always written into intermediate memories. Subsequently, the stored and, under certain conditions, current echo signal information are supplied to an evaluation installation. During a specific section time, which determines the depth ( tau ) of the surround field, a mean value of the echo intensity in the surround field is here at least approximately comprehended. This, if necessary after previous dynamic limitation, is placed in ratio at a ratio former to the echo respectively to be depicted. The ratio signal is the recording signal for the recording installation.
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