10 Questions – Sonography Principles and Instrumentation Practice Exam

Principles and Instrumentation (SPI)

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Question 1
For Pulsed Wave transducers what is one characteristic that determines the center operating frequency?
A
The thickness of the backing material.
B
The Propagation Speed of the medium.
C
Spatial Pulse length.
D
The Propagation Speed of the crystal.
Question 2
As you lengthen the pulse duration the sensitivity of the transducer...?
A
Increases.
B
Stays the same.
C
These two values are not related.
D
Decreases.
Question 2 Explanation: 
Short pulse duration = lower sensitivity. Long pulse duration = higher sensitivity.
Question 3
An unexpected reflection of an acoustic wave causes all of the following artifacts except what?
A
Comet Tail
B
Multipath
C
Side lobe artifact
D
Reverberation
Question 3 Explanation: 
Side lobe artifact is generated by the beam.
Question 4
This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.
A
Longitudinal resolution
B
Shadowing
C
Range ambiguity
D
Lateral incertitude
Question 5
The reflection coefficient for intensity is defined as?
A
Z2-Z1 / Z2+Z1 then squared
B
Z2+Z1 / Z2-Z1 then squared
C
Z2-Z1 / Z2+Z1
D
Z2+Z1 / Z2-Z1
Question 5 Explanation: 
Z is the acoustic impedance. Z1 is the acoustic impedance of the first medium and Z2 is the acoustic impedance of the second medium. The Intensity Transmission Coefficient (IRC) is unitless. It can also be seen in the following equation. Intensity Transmission Coefficient (%) = reflected intensity (w/cm2) / incident intensity (w/cm2) X 100
Question 6
The most accurate technique for spectral analysis is what?
A
Autocorrelation
B
Fast Fourier transformation
C
Rectification
D
Correlation Function
Question 7
-20dB means that the intensity is reduced to what portion of its original power?
A
1/100
B
-10x
C
1/10
D
10x
Question 8
Spectral analysis is done by?
A
Demodulation
B
Rectification
C
Fast Fourier transformation
D
Smoothing
Question 9
Comet tail artifact has what characteristics?
A
Twinkle seen on color doppler deep to reflector.
B
Shadow deep to reflector.
C
Echogenic line superficial to reflector.
D
Echogenic line deep to reflector.
Question 10
What denotes the number of cycles passing a given point each second?
A
Wavelength
B
Period
C
Frequency
D
Pulse Repetition Frequency
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    • It’s my pleasure. We hope to be able to help as much as we can. Feel free to send us a message if there is anything we can help with. Also if there is a concept that maybe we could explain or cover a little more. We want to have the best material to prepare you.

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    • Good luck. You’ll do great. Let me know if I can do anything to help.

      • Elaine Covaleski says:

        Awe, thank you sooo much. I took my physics part of US months ago but they told me to hold off on the SPI test. I wish I took it back then. I’ve forgotten so much of it.

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  5. Allan Tovar says:

    I am 21 yrs old i finished th eultrasound program in 2010 when i was 19 i have fallen off the wagon of studying this do to a lack of jobs available! but can anyone spare some notes and hints? i would appriciate it alot!