What is the frequency range for medical diagnostic Doppler transducers?

What is the frequency range for medical diagnostic Doppler transducers?

• A. 10-20 MHz
• B. 1-10 kHz
• C. 2-20 Hz
• D. 2-10 MHz

Answer: (D)

Medical diagnostic Doppler transducers operate in the megahertz range. The frequency is chosen to balance how deep the ultrasound can penetrate with how sharp the image and flow information will be. For most diagnostic Doppler work, about 2 to 10 MHz is used. This range provides enough penetration for deep vessels and organs while still offering good resolution for evaluating blood flow. Frequencies outside this range aren’t typical for standard diagnostic Doppler: kilohertz or hertz are far below ultrasound and not usable for imaging, and while higher-frequency probes can exist for very superficial structures, the common, versatile diagnostic range is 2–10 MHz.

Medical diagnostic Doppler transducers operate in the megahertz range. The frequency is chosen to balance how deep the ultrasound can penetrate with how sharp the image and flow information will be. For most diagnostic Doppler work, about 2 to 10 MHz is used. This range provides enough penetration for deep vessels and organs while still offering good resolution for evaluating blood flow. Frequencies outside this range aren’t typical for standard diagnostic Doppler: kilohertz or hertz are far below ultrasound and not usable for imaging, and while higher-frequency probes can exist for very superficial structures, the common, versatile diagnostic range is 2–10 MHz.