Physics-Doppler

Which one of the following is true about color map 1?
A. Red indicates turbulent flow
B. Blue indicates turbulent flow
C. Blue indicates laminar flow away from the transducer
D. Red indicates flow away from the transduer
E. Red indicates flow toward the transducer

Which one of the following is true about color map 1?
A. Blue indicates flow toward the transducer
B. Blue indicates laminar flow away from the transducer
C. Red indicates flow away from the transducer
D. Blue indicates flow away from the transducer
E. Blue indicates turbulent flow

Which of the following is true about color map 2?
A. blue indicates flow toward the transducer
B. dark blue indicates laminar flow away from the transducer
C. blue indicates flow away from the transducer
D. red indicates turbulent flow
E. light blue indicates turbulent flow

Which of the following is true about color map 2?
A. green indicates higher volume flow toward the transducer
B. green indicates higher velocity flow toward the transducer
C. red indicates turbulent flow
D. blue indicates laminar flow away from the transducer
E. red indicates flow away from the transducer

Which statement is true about color map 1?
A. red indicates turbulent flow
B. blue indicates turbulent flow
C. green indicates laminar flow away from the transducer
D. red and yellow indicate flow toward the transducer
E. red indicates flow away from the transducer

Which statement is true about color map 1?
A. red and yellow indicate flow away from the transducer
B. red indicates flow away from the transducer
C. blue indicates turbulent flow
D. green indicates turbulent flow away from the transducer
E. red indicates turbulent flow

Which statement is best reason why color map 1 is a variance mode map?
A. blue indicates flow away from transducer
B. red indicates flow toward transducer
C. red indicates turbulent flow
D. blue and green indicate flow away from transducer
E. yellow indicates flow away from transducer

Which statement is true about color map 2?
A. light blue indicates flow toward the transducer
B. red indicates turbulent flow
C. dark blue indicates laminar flow away from transducer
D. red indicates flow away from transducer
E. dark blue indicates turbulent flow

Which statement is true about color map 2?
A. light blue indicates laminar flow toward transducer
B. red indicates turbulent flow
C. red indicates turbulent flow toward transducer
D. red indicates flow away from transducer
E. light blue indicates turbulent flow

In which direction does blood flow through the top of the vessel?
A. left to right
B. left to right, then right to left
C. rigth to left
D. right to left, then left to right

What does the black area in the center of both vessels represent?
A. zero Doppler shift
B. a clot
C. no flow
D. a disection
E. all of the above

In which direction is blood flowing through the vessel?
A. right to left, then left to right
B. right to left
C. left to right, then right to left
D. left to right

The Doppler effect is presented as a ___________ when the sourse and the receiver are ___________.

Starting from the same point, the sound source is moving toward the East at 12 miles/hour and the receiver is moving toward the West at 10 miles/hour. The Doppler shift is __________. (+ or -)

Starting from the same point, the receiver is moving toward the West at 12 miles/hour and the source is moving toward the West at 10 miles/hour. The Doppler shift is __________. (+ or -)

Doppler shift produces information about __________.

At what angle between the sound beam and the direction of motion will the Doppler shift be a maximum?

At what angle between the sound beam and the direction of motion will the Doppler shift be a minimum?

What is the difference between speed and velocity?

What is the current method of processing Doppler signals?

What is the typical range of Doppler shift found in diagnostic imaging examinations?

The phenomenon where high velocities appear negative is called __________.

The frequency at which aliasing occurs is called __________.

The are of interrogation in a pulsed Doppler exam is called __________.

True or False.
The higher the emitted frequency, the more likely a pulsed wave signal is to alias.

True or False.
Shallower sample volumes result in more aliasing.

True or False.
Only pulsed wave Doppler exams have a sample volume.

An 8 MHz transducer with a pulse repetition frequency of 5,000 Hz is imaging to a depth of 7 cm. What is the Nyquist frequency?
A. 4 MHz
B. 3.5 Hz
C. 2.2 kHz
D. 2.5 dB
E. 5 kHz

An 8 MHz transducer with a PRF of 5000 Hz measures a Doppler shift of 7 kHz. The study is repeated with a 4 MHz transducer. What Doppler shift will be measured?
A. 4 MHz
B. 3.5 Hz
C. 4 kHz
D. 3.5 dB
E. 3500 Hz