| 摘要 |
A probe 10 receives an echo signal, and the echo signal is stored in memory 18 . Operation desk 28 a has at least one readout-range setting device 34 for setting an echo signal readout-sensitivity range of the echo signal stored in memory 18 . Echo signals in the sensitivity range preset by readout-range setting device 34 is read out from memory 18 from among the echo signals in the sensitivity range stored in memory 18 . The echo signal read out of memory 18 is converted into data corresponding to the display dynamic range of monitor 24 a by a digital gain regulation circuit 31 . The converted data is inputted into image construction unit 22 to create image data. The image data is displayed on the screen of monitor 24 a.
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