MENU
What parameter change reduces spectral Doppler aliasing?
Suggested Answer: A
Get Premium SPI Questions
as Interactive Web-Based Practice Test or PDF
Real Exam Format
Detailed Explanations
Instant Access
Get Your Practice Test
Comprehensive and Detailed Explanation From Exact Extract:
Spectral Doppler aliasing occurs when the Doppler frequency shift exceeds the Nyquist limit. The Doppler shift is proportional to the cosine of the Doppler angle. Increasing the Doppler angle (moving closer to 90 degrees) reduces the cosine value, thus reducing the Doppler shift frequency and helping to avoid aliasing.
According to sonography instrumentation reference:
''Increasing the Doppler angle reduces the Doppler shift frequency, thus decreasing the likelihood of aliasing in spectral Doppler.''
Therefore, the correct answer is A: Increase Doppler angle.
---
12 comments · newest first
LA
Lavera
3 days ago
I thought increasing the Doppler angle was the way to go?
DE
Deandrea
8 days ago
Totally agree with C! It really works.
TE
Tenesha
13 days ago
C is the right answer! Decreasing pulse repetition frequency helps.
VI
Vicky
18 days ago
Not sure about that, sounds a bit off to me.
TE
Tequila
23 days ago
Wait, can increasing the Doppler angle actually help?
KA
Kathrine
29 days ago
Definitely C! It really reduces aliasing.
MA
Marshall
1 month ago
I thought changing the color scale helped too?
LO
Louann
1 month ago
Decrease pulse repetition frequency is the way to go!
LI
Lizbeth
1 month ago
Utilizing m-mode seems unrelated to aliasing, but I might be mixing it up with other Doppler concepts we covered.
WI
William
2 months ago
I feel like decreasing the pulse repetition frequency is the right answer, but I can't recall the exact reasoning behind it.
AL
Alyce
2 months ago
I remember practicing a question about color scale adjustments, so maybe changing the color scale could reduce aliasing too?
IR
Irving
2 months ago
I think increasing the Doppler angle might help, but I'm not entirely sure how that affects aliasing.