10 Questions – Sonography Principles and Instrumentation Practice Exam

Principles and Instrumentation (SPI)

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Question 1
An US pulse has a PRP of 0.8 msec, a spatial pulse length of 2.0 mm and a wavelength of 2.0 mm. What is the longitudinal resolution of the system?
A
0.5 mm
B
1.0 mm
C
0.3 mm
D
0.4 mm
Question 1 Explanation: 
The equation for LARD Resolution is SPL / 2
Question 2
Line density refers to?
A
The width of the image in relation to the depth of the image
B
The depth of the image in relation to the number of scan lines
C
The width of the image in relation to the number of scan lines
D
The number of scan lines in relation to frame rate
Question 2 Explanation: 
If you have an image that is 5 cm wide and has 100 scan lines they will be much closer together (denser) than an image that is 10 cm wide and has 100 scan lines.
Question 3
A low frame rate will cause?
A
Poor spatial resolution
B
Fast moving structures to be resolved
C
Poor temporal resolution
D
Improved temporal resolution
Question 3 Explanation: 
Temporal resolution is synonymous with frame rate. Typical frame rates in imaging systems are 30-100 Hz. The temporal resolution or frame rate = 1/(time to scan 1 frame). Frame rate can drop down to 5 Hz. When scanning you would notice this because your image would barely be moving. This happens when there are multiple focal zones and a great depth. It takes a lot of time to create each frame so the rate has to be low.
Question 4
The typical frame rate of an Ultrasound system is?
A
Between 40 Hz and 400 Hz
B
Always 78 Hz
C
Between 30 Hz and 100 Hz
D
Between 5 MHz and 40 MHz
Question 4 Explanation: 
Temporal resolution is synonymous with frame rate. Typical frame rates in imaging systems are 30-100 Hz. The temporal resolution or frame rate = 1/(time to scan 1 frame). Frame rate can drop down to 5 Hz. When scanning you would notice this because your image would barely be moving. This happens when there are multiple focal zones and a great depth. It takes a lot of time to create each frame so the rate has to be low.
Question 5
Two identical systems produce a pulse. One pulse is 0.8 usec in duration while the other is 1.4 usec. The best azimuthal resolution will be created by which system?
A
0.8 usec pulse
B
Undetermined. Pulse duration is not related to azimuthal resolution.
C
Resolution will be identical
D
1.4 usec pulse
Question 5 Explanation: 
Pulse duration (PD) has nothing to do with LATA. It is dependent on the wavelength not how long the pulse is.
Question 6
Carotid Ultrasound Flow Practice QuestionIn this image what is the direction of flow?
A
Towards the Transducer.
B
Monophasic.
C
Away from the Transducer.
D
Cannot be determined from this image.
Question 6 Explanation: 
Using the color scale on the image you can see that red is towards the transducer, while blue is away. If you get this image on the registry make sure you see the color scale and don't just guess the direction. Many questions won't have the color scale and you will assume the direction.
Question 7
Pressure, density and particle motion are what in relation to sound?
A
Motion variables
B
Units
C
Acoustic variables
D
Wave patterns
Question 8
This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.
A
Longitudinal resolution
B
Shadowing
C
Lateral incertitude
D
Range ambiguity
Question 9
Rounding artifact (edge shadow) is mainly due to what?
A
Reflection.
B
Refraction.
C
Propagation Speed Error.
D
Absorption.
Question 10
Q-factor is related to bandwidth how?
A
Inversely.
B
They are independent of each other.
C
Directly.
D
Factor of 5/9.
Question 10 Explanation: 
Q factor relates to how damped an oscillator is. If it's not damped it will ring like a bell with many different frequencies. If it is damped it will be limited to a few frequencies. So as Q factor (damping) increases, bandwidth decreases.
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I am the founder and lead Instructor here at ExamRefresh.com. I strive to help those that are entering the field of Ultrasound to be the best that they can be. Ultrasound is my passion.

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Comments

  1. Elizabeth Vargas says:

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    ELIZABETH VARGAS

    • 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.

  2. Elaine Covaleski says:

    Yes, I agree this website is very helpful. Still will need prayers though to pass this test!! LOL.

    • 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.

  3. Elaine Covaleski says:

    I’ve heard so many horror stories of people failing it. I really want to pass it the first time around.

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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!