Ultrasonic diagnostic system

An ultrasonic diagnostic system comprising:

• a vibrator for applying mechanical vibration to a subject to generate shear waves in said subject;
• at least one first transceiver for performing transmission/reception of first ultrasound for detecting said shear waves generated in said subject by said mechanical vibration applied by said vibrator;
• a second transceiver for performing transmission/reception of second ultrasound different from said first ultrasound to/from said subject;
• and
• a processor configured to:
• drive said second transceiver to transmit said second ultrasound;
• calculate a value of a parameter affecting a most suitable frequency of the first ultrasound to be transmitted from said first transceiver based on echo signals obtained by transmission/reception of said second ultrasound, wherein the value of said parameter is at least one of an amount of ultrasound attenuation in said subject, and a distance from a body surface to a diaphragm of said subject;
• identify the most suitable frequency of the first ultrasound based on the value of the parameter;
• control said vibrator to apply the mechanical vibration to said subject and
• drive said first transceiver to transmit said first ultrasound at the most suitable frequency to detect the shear waves after said mechanical vibration is applied.