DAVIES SPI REVIEW STUDY SHEET 2026
ACCURATE SOLUTION COLLECTION
◉ Which transducers do NOT use backing material?
Answer: Continuous Wave Doppler do NOT use backing material
◉ What is the greatest advantage of PULSED wave doppler?
Answer: Range specificity; being able to select the exact location
where velocities are measured
◉ What is the primary DISADVANTAGE of pulsed wave doppler?
Answer: Inaccurate measurement of high velocities; ALIASING
◉ Low quality factor, lower sensitivity, and wide bandwidth describe
what type of transducer:
Answer: Imaging and doppler transducers
◉ What is the most common error associated with Doppler
ultrasound?
Answer: Aliasing
, ◉ The very top of the display in doppler is called:
Answer: The Nyquist limit
◉ The part of the spectrum appearing at the bottom of the display in
a doppler image is called:
Answer: Aliasing
◉ What is the limit at which aliasing occurs?
Answer: Exceeding the Nyquist limit
◉ What is the Nyquist limit formula?
Answer: PRF (Hz) /2
◉ What are the 3 acoustic variables that identify sound waves?
Answer: Pressure, density, distance
◉ What are the 7 parameters that describe sound waves?
Answer: Period, frequency, amplitude, power, intensity, wavelength,
speed
◉ "The tie required to complete a single cycle" describes:
Answer: Period
ACCURATE SOLUTION COLLECTION
◉ Which transducers do NOT use backing material?
Answer: Continuous Wave Doppler do NOT use backing material
◉ What is the greatest advantage of PULSED wave doppler?
Answer: Range specificity; being able to select the exact location
where velocities are measured
◉ What is the primary DISADVANTAGE of pulsed wave doppler?
Answer: Inaccurate measurement of high velocities; ALIASING
◉ Low quality factor, lower sensitivity, and wide bandwidth describe
what type of transducer:
Answer: Imaging and doppler transducers
◉ What is the most common error associated with Doppler
ultrasound?
Answer: Aliasing
, ◉ The very top of the display in doppler is called:
Answer: The Nyquist limit
◉ The part of the spectrum appearing at the bottom of the display in
a doppler image is called:
Answer: Aliasing
◉ What is the limit at which aliasing occurs?
Answer: Exceeding the Nyquist limit
◉ What is the Nyquist limit formula?
Answer: PRF (Hz) /2
◉ What are the 3 acoustic variables that identify sound waves?
Answer: Pressure, density, distance
◉ What are the 7 parameters that describe sound waves?
Answer: Period, frequency, amplitude, power, intensity, wavelength,
speed
◉ "The tie required to complete a single cycle" describes:
Answer: Period
