Question

If a carotid duplex exam is performed on a patient with a 7MHz transducer and a 14 MHz transducer, which transducer will display a shift that is greater?

a. The 14 MHz transducer
b. The Doppler shift is the same with both transducers.
c. The 7 MHz transducer
d. The Doppler shift cannot be identified with this information.

Answer 1

A 14MHz transducer will display a greater Doppler shift than a 7MHz transducer because the Doppler shift magnitude is directly proportional to the frequency of the ultrasound used.

Step-by-step explanation:

When considering whether a 7MHz transducer or a 14MHz transducer will display a greater Doppler shift, the higher the frequency of the transducer, the greater the Doppler shift that will be observed. This is because the magnitude of the Doppler shift in an echo is directly proportional to the frequency of the ultrasound used. Hence, a 14MHz transducer will display a greater shift than a 7MHz transducer if all other conditions are identical.