Ultrasonic imaging system

An ultrasonic imaging system comprising:

• (a) an ultrasonic probe for transmitting and receiving an ultrasonic wave;
• (b) driver means for driving said ultrasonic probe;
• (c) detector means for detecting an echo signal received by said ultrasonic probe to generate a detection signal;
• (d) filter means receiving and passing said detection signal therethrough and having a plurality of passbands which have respective flat frequency response characteristics and respective gains different from each other;
• (e) scanning conversion means for converting the detection signal, which has passed through said filter means, to a display signal;
• and
• (f) display means for displaying thereon the display signal converted by said scanning conversion means in the form of a tomographic image, wherein:
• said filter means comprises an inverting amplifier having one input terminal supplied with said detection signal through an input resistor, said inverting amplifier being connected with a negative feedback circuit comprising a resistor connected between the one input terminal and an output terminal of said inverting amplifier and a series circuit of a capacitor and a resistor connected in parallel with said resistor.

An ultrasonic imaging system comprising:

• (a) an ultrasonic probe for transmitting and receiving an ultrasonic wave;
• (b) driver means for driving said ultrasonic probe;
• (c) detector means for detecting an echo signal of a single passband received by said ultrasonic probe to generate a detection signal;
• (d) filter means for receiving and passing said detection signal therethrough and having a plurality of passbands which have respective flat frequency response characteristics, wherein respective gains of the plurality of passbands are set to decrease toward higher frequency passbands;
• (e) scanning conversion means for converting the detection signal, which has passed through said filter means, to a display signal;
• and
• (f) display means for displaying thereon the display signal converted by said scanning conversion means in the form of a tomographic image, wherein:
• said filter means comprises an inverting amplifier having one input terminal supplied with said detection signal through an input resistor, said inverting amplifier being connected with a negative feedback circuit comprising a resistor connected between the one input terminal and an output terminal of said inverting amplifier and a series circuit of a capacitor and a resistor connected in parallel with said resistor.