Question

Ultrasound probe emitting sound with wavelength of 70 mm in air (sound speed 343 m/s) is used for probing a muscle tissue (sound speed 1500 m/s). What are the smallest features in air and the muscle tissue that can be seen with this device? (doesn’t have to be typed in, may scan a solution)

Answer #1

Wavelength of Ultrasound in air

Wave speed of Ultrasound waves in air

Wave speed of Ultrasound waves in muscle tissue

Wavelength of Ultrasound in muscle tissue

Ultrasound is defined as sound waves with a frequency more than

According to above data, frequenbcy of Ultra sound wave used is

According to Rayleigh criterion, smallest angular size resoled is where is diameter of lens of imaging device.

Hence angular size of smallest feature that can be detected in air is

Hence angular size of smallest feature that can be detected in muscle is

(D is not given )

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