Attenuation of Ultrasound. Ultrasound is absorbed in the body; this complicates

Question

Attenuation of Ultrasound. Ultrasound is absorbed in the body; this complicates the use of ultrasound to image tissues. The intensity of a beam of ultrasound decreases by a factor of 2 after traveling a distance of 40 wavelengths. Each additional travel of 40 wavelengths results in a decrease by another factor of 2. Assume speed of ultrasound in human tissue v= 1540 m/s.

A beam of 1.5 ultrasound begins with an intensity of 1000 . After traveling 10 through tissue with no significant reflection, the intensity is about?

A physician is making an image with ultrasound of initial intensity 1000 . When the frequency is set to 1.5 , the intensity drops to 500 at a certain depth in the patient's body. What will be the intensity at this depth if the physician changes the frequency to 3.0 ?

A physician is using ultrasound to make an image of a patient's heart. Increasing the frequency will provide

A physician is using Doppler ultrasound to measure the motion of a patient's heart. The device measures the beat frequency between the emitted and the reflected waves. Increasing the frequency of the ultrasound will

Explanation / Answer

1 A 2 C 3 D 4 D

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