ARDMS SPI Spectral Doppler Waveform Analysis

Question 1

Which formula correctly represents the Resistive Index (RI)?

Accepted Answer

(PSV - EDV) / PSV

Answer

The RI (Pourcelot index) = (PSV - EDV) / PSV, producing a value between 0 and 1 that reflects downstream vascular resistance.

Question 2

Spectral broadening on a Doppler waveform indicates:

Accepted Answer

A wide range of velocities simultaneously present within the sample volume

Answer

Spectral broadening occurs when multiple velocity components are detected within the sample volume, filling in the clear spectral window beneath the waveform envelope.

Question 3

The spectral window in a Doppler display represents:

Accepted Answer

The clear area beneath the systolic peak where few slow-moving cells are present

Answer

The spectral window is the clear area beneath the waveform envelope, indicating relatively uniform laminar flow where most cells travel at similar velocities with few slow-moving cells near the vessel wall.

Question 4

Which Doppler insonation angle range provides the most accurate velocity measurement?

Accepted Answer

60 degrees or less

Answer

Angles of 60 degrees or less are recommended because the cosine function changes gradually in this range, minimizing the amplification of small angle errors in velocity calculations.

Question 5

A high-resistance spectral Doppler waveform is characterized by:

Accepted Answer

Low or absent end-diastolic velocity with a sharp systolic peak

Answer

High-resistance vessels (such as resting peripheral arteries) display a sharp systolic peak with little or no diastolic flow and may demonstrate brief flow reversal in early diastole.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI Spectral Doppler Waveform Analysis