| 摘要 |
PURPOSE:To enable the formation of a clear sectional image by outputting a received ultrasonic wave signal adjusted in the depth of focus as synthesized via a delay circuit, a BPF and the like with a sequential switching. CONSTITUTION:With an ultrasonic beam emitted to an object from vibrators C1-C8, echo signals are received with the vibrators C1-C8 corresponding to depths of the object. The echo signals corresponding to depth shallow are inputted into a time/gain control circuit M or the like via a delay circuit DL1 matching the focal length of the signals, a band pass filter F1 likewise matching it and a coupling circuit H. Similarly, received ultrasonic wave signals adjusted in the depth of focus with the delay circuit and a band-pass filter, e.g. a DL2, F2, DL3, F3 and the like are outputted sequentially via the circuit H. This enables the formation of a clear sectional image depending on an echo signal of the optimum resolution and a high signal-noise ratio with the control interlocking the focusing and filter characteristics to match the depth. |
