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Doppler (SPI) Questions and Answers 100% Correct Update
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Doppler (SPI) Questions and Answers 100%Correct Update 2024-2025
The doppler effect is observed as a change in ________ and has units of
_________. - ANSWER Frequence, per second
In clinical imaging, which reflectors produce most relevant Doppler shifts? -
ANSWER Red blood cells
If red blood cells are traveling TOWARD a trasducer, the F emitted by the
transducer is _______ the frequency reflected from the red blood cells. -
ANSWER Less than
What is the range of Doppler shifts commonly measure in clinical exams? -
ANSWER -20,000 Hz to +20,000 Hz
When red blood cells move AWAY from a transducer, the F of the wave reflected
from rbc is _______ the f emitted by the transducer. - ANSWER Less than
What information does the Doppler shift furnish concerning the blood cells that
produce it? - ANSWER Velocity
What is the relationship of doppler shift to velocity? - ANSWER Directly related
(when the velocity doubles, the Doppler shift doubles)
Two ultrasound transducers are used to perform Doppler exams on the same
patient. The exams are identical except that the transducer f are 5 and 2.5 Mhz.
, Which exam will measure the highest Doppler shift? - ANSWER The 5 Mhz
exam bec doppler shifts are related to the transmitted frequency
Maximum velocities are measured at a? - ANSWER Zero degree angle
A maximum Doppler shift is obtained when thr angle between the direction of
blood flow and the dierection of thr sound beam is _______. - ANSWER 180
degrees
Alising does not occur with Continuous wave Doppler. - ANSWER True
The dury cycle of the CW is 100% - ANSWER True
Range ambiguity - ANSWER The inability to distinguish the absolute depth
where the Doppler shift was created.
Duty cycle - ANSWER The percentage of time that the ultrasound transducer is
prpducing sound
Continuous wave transducers have a _______bandwidth - ANSWER Narrow
A duplex ultrasound system displays ___________information. - ANSWER 2D
image and Doppler
Continous Doppler has - ANSWER Narrow bandwidth
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