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Liberty University
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SPI Midterm| 100 questions| with complete solutions
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What is the main disadvantage of continuous wave (Pedof) transducers? CORRECT ANSWERS: Depth ambiguity 
 
What function of the receiver is responsible for the rectification and smoothing? CORRECT ANSWERS: Demodulation 
 
What is the purpose of a transmit/receive (T/R) switch? CORRECT ANSWERS: It ensures that the pulser voltages go to the transducer, and the received voltages from the transducer go to the signal processor. 
 
If the amplitude of a wave is increased by a factor of 3, what happe...
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Penny SPI QUESTIONS WITH COMPLETE SOLUTIONS
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Which of the following is used to eliminate the low-frequency signals that appear as noise as a result of wall/valve motion? 
A. High-pass filter 
B. Bass-thump filter 
C. Low-pass filter 
D. High-frequency filter CORRECT ANSWERS: A. High-pass filter 
AKA wall filter 
AKA wall-thump filter 
 
According to Poiseuille, the most significant contributor to flow is: 
A. Length of vessel 
B. Viscosity 
C. Radius 
D. Pressure CORRECT ANSWERS: C. Radius 
*Poiseuille's Law 
Volume flow rate = π(pres...
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SPI exam 1| 86 QUESTIONS| WITH COMPLETE SOLUTIONS
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Electronic pulses from the pulser are applied to the CORRECT ANSWERS: Transducer 
 
Which of the following is performed by the receiver CORRECT ANSWERS: Amplification, compensation, compression, demodulation 
 
The dynamic range of ultrasound system is defined as CORRECT ANSWERS: The ratio of the maximum to the minimum intensity that can be displayed 
 
How is Q (quality factor) of a transducer determined CORRECT ANSWERS: Frequency divided by bandwidth 
 
The most commonly used man-made crys...
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SPI 2023| 553 QUESTIONS| WITH COMPLETE SOLUTIONS
- Exam (elaborations) • 35 pages • 2023
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Absorption CORRECT ANSWERS: The conversion of sound energy to heat 
 
Acoustic speckle CORRECT ANSWERS: The interference pattern caused by scatters and produces the granular appearance of tissue on a sonographic image 
 
Amplitude CORRECT ANSWERS: The maximum or minimum deviation of an acoustic variable from the average value of that variable; the strength of the reflector 
 
Attenuation CORRECT ANSWERS: A decrease in the amplitude, power, and intensity of the sound beam as sound travels thr...
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SPI Practice Questions #1 WITH COMPLETE SOLUTIONS
- Exam (elaborations) • 4 pages • 2023
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1. The term Anechoic in relation to a sonographic image means? 
A. structure that appears lighter than the surrounding structures 
B. The absence of echos 
C. A structure that appears the same as surrounding structures 
D. A structure that reflects 100% of the sound wave CORRECT ANSWERS: B. The absence of echos 
 
Question 1 Explanation: An (without) echoic (producing echoes) 
 
2. If you have two near identical systems with different diameter piezoelectric crystals in the transducer which syst...
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Physics SPI Exam| 81 QUESTIONS| WITH COMPLETE SOLUTIONS
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When sound hits a boundary between two media of the same propagation speed at oblique incidence: CORRECT ANSWERS: no refraction will occur. 
 
Refraction requires the oblique incidence of sound across a boundary between two media with different propagation speeds. 
 
As transducer frequency increases: CORRECT ANSWERS: axial and lateral resolution will increase 
 
Blood flow volume changes in the body are mainly controlled by what two factors? CORRECT ANSWERS: cardiac function and peripheral r...
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SPI RELATIONSHIPS 58 QUESTIONS| WITH COMPLETE SOLUTIONS
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frequency and period CORRECT ANSWERS: inverse 
 
stiffness and propagation speed CORRECT ANSWERS: direct 
 
density and propagation speed CORRECT ANSWERS: inverse 
 
frequency and wavelength CORRECT ANSWERS: inverse 
 
power and amplitude CORRECT ANSWERS: direct 
 
proportional to amplitude squared CORRECT ANSWERS: 
 
intensity and power CORRECT ANSWERS: direct 
 
intensity and area CORRECT ANSWERS: inverse 
 
intensity and amplitude CORRECT ANSWERS: direct 
 
proportional to amplitude...
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Doppler (SPI)| 75 QUESTIONS| WITH COMPLETE SOLUTIONS
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The doppler effect is observed as a change in ________ and has units of _________. CORRECT ANSWERS: Frequence, per second 
 
In clinical imaging, which reflectors produce most relevant Doppler shifts? CORRECT ANSWERS: 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. CORRECT ANSWERS: Less than 
 
What is the range of Doppler shifts commonly measure in clinical exams? CORRECT ANS...
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SPI Exam TEST| 120 QUESTIONS| WITH COMPLETE SOLUTIONS
- Exam (elaborations) • 27 pages • 2023
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All of the following are AIUM recommendations regarding the use of ultrasound, except: 
A. Always adhere to the ALARA principle when scanning 
B. Limit the examination time to the shortest time necessary to complete a diagnostic exam 
C. In order to limit ultrasound intensity, always use PW Doppler instead of M-mode to evaluate the fetal heart 
D. Limit ultrasound exposure to patients that require an examination for a specific reason CORRECT ANSWERS: C. In order to limit ultrasound intensity, ...
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SPI Exam| 505 Questions| WITH COMPLETE SOLUTIONS
- Exam (elaborations) • 31 pages • 2023
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What is described as the ability of an object to resist compression and relates to the hardness of a medium? CORRECT ANSWERS: stiffness 
 
An increase in PRF would lead to CORRECT ANSWERS: an increase in DF 
 
what has the higher propagation speed? air, bone, soft tissue or water CORRECT ANSWERS: bone 
 
what has a lower propagation speed? water, soft tissue, bone or lung tissue CORRECT ANSWERS: lung tissue 
 
as imaging depth increases, the PRF must CORRECT ANSWERS: decrease 
 
what law de...
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