Which Doppler modality would most likely have the highest SPTA value?

Which Doppler modality would most likely have the highest SPTA value?

• A. CW Doppler
• B. B-mode real-time scanners
• C. Static B-mode
• D. PW Doppler

Answer: (D)

SPTA is the energy delivered to tissue at the location where the beam is strongest, averaged over time. In this sense, higher peak energies and how long the tissue is exposed during each pulse influence the value. Continuous wave Doppler emits energy without interruption, so the energy at the focal region is steady, but the other modalities differ in how they transmit. B-mode real-time imaging and static B-mode use pulsed transmissions designed for imaging rather than velocity detection, typically with lower instantaneous power per pulse and energy spread over imaging frames. Pulsed-wave Doppler, on the other hand, uses relatively high-energy pulses to detect motion and velocity, even though those pulses are brief and followed by off times. The result is substantial energy delivered during the pulse periods, and when averaged over time, this can yield a higher SPTA than the other modes listed. So, pulsed-wave Doppler would have the highest SPTA value.

SPTA is the energy delivered to tissue at the location where the beam is strongest, averaged over time. In this sense, higher peak energies and how long the tissue is exposed during each pulse influence the value.

Continuous wave Doppler emits energy without interruption, so the energy at the focal region is steady, but the other modalities differ in how they transmit. B-mode real-time imaging and static B-mode use pulsed transmissions designed for imaging rather than velocity detection, typically with lower instantaneous power per pulse and energy spread over imaging frames. Pulsed-wave Doppler, on the other hand, uses relatively high-energy pulses to detect motion and velocity, even though those pulses are brief and followed by off times. The result is substantial energy delivered during the pulse periods, and when averaged over time, this can yield a higher SPTA than the other modes listed.

So, pulsed-wave Doppler would have the highest SPTA value.