Exam (elaborations)
EDELMAN UNDERSTANDING ULTRASOUND PHYSICS EXAM REVIEW QUESTIONS AND ANSWERS 2024
- Course
- Institution
EDELMAN UNDERSTANDING ULTRASOUND PHYSICS EXAM REVIEW QUESTIONS AND ANSWERS 2024
[Show more]
Content preview
EDELMAN UNDERSTANDINGULTRASOUND PHYSICS EXAM REVIEW
A maximum Doppler shift is obtained when the angle between the direction of
blood flow and the direction of the sound beam is __________.
a. 10 degrees
b. 90 degrees
c. 180 degrees
d. 270 degrees - ANSWERS-180 degrees
True or false? The appearance of negative velocities on the spectral display of a
continuous wave Doppler exam always indicates that red blood cells are moving
away from the transducer. - ANSWERS-True
With regard to CW Doppler, is the following statement true or false? A minimum
of two distinct piezoelectric crystals are in the transducer. - ANSWERS-True
With regard to CW Doppler, is the following statement true or false? Problems
with aliasing significantly limit its clinical utility. - ANSWERS-False
,With regard to CW Doppler, is the following statement true or false? Frequencies
measured at the transducer are produced from many different locations along the
ultrasonic beam. - ANSWERS-True
With regard to CW Doppler, is the following statement true or false? The duty
cycle of the continuous wave is 100%. - ANSWERS-True
All of the following are related to dedicated continuous wave Doppler transducers
except :
a. Wide bandwidth
b. High quality factor
c. Higher sensitivity
d. Range ambiguity - ANSWERS-Wide bandwidth
A duplex ultrasound system displays _________ information.
a. M-mode, two-dimensional image, and A-mode
b. A-mode and B-mode
c. Two-dimensional image and Doppler
d. Two-dimensional image and M-mode - ANSWERS-Two-dimensional image and
Doppler
All of the following are associated with a CW Doppler transducer except :
a. Narrow bandwidth
,b. Increased sensitivity
c. Backing material
d. High Q-factor - ANSWERS-Backing material
The information that is processed by a standard duplex ultrasound system
includes all of the following except :
a. Attenuation
b. Amplitude
c. Frequency
d. Time of arrival - ANSWERS-Attenuation
True or false? The appearance of negative velocities in a pulsed Doppler display
always indicates that red blood cells are moving away from the transducer. -
ANSWERS-False
With pulsed Doppler, what term is used to describe a very high positive Doppler
shift that is displayed as a negative waveform?
a. Attenuation
b. Filtering
c. Demodulation
d. Aliasing - ANSWERS-Aliasing
, The highest doppler frequency without the appearance of aliasing is called the
______ and is equal to ______.
a. Aliasing limit, half of the emitted frequency
b. Pulse repetition frequency, the pulse repetition frequency
c. Nyquist limit, half of the emitted frequency
d. Nyquist limit, half of the emitted PRF - ANSWERS-Nyquist limit, half of the
emitted PRF
True or false? In a pulsed Doppler exam,the use of a higher transducer frequency
increases the likelihood that aliasing will appear. - ANSWERS-True
True or false? The higher the pulse repetition frequency of a Doppler exam, the
more likely aliasing is to occur. - ANSWERS-False
A system has three transducers with frequencies of 7.5 MHz, 5 MHz and 3.25
MHz. Aliasing appears while using the 5.0 MHz transducer during a pulsed
Doppler exam. What should the sonographer do?
a. Use the 3.25 MHz transducer
b. Use the 7.5 MHz transducer
c. Nothing; the other transducers do not provide solutions to the problem -
ANSWERS-Use the 3.25 MHz transducer
The frequency of a pulsed Doppler wave is 6 MHz, and the PRF is 5 kHz. What is
the maximum Doppler shift that can be recorded without aliasing?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Teacher101. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now