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.
A physician is using ultrasound to make an image of a patient’s heart. Increasing the frequency will provide
A. Better penetration and better resolution.
B. Less penetration but better resolution.
C. More penetration but worse resolution.
D. Less penetration and worse resolution.
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