The direction of the Doppler shift determines:
A. the peak velocity of the flow
B. the color Doppler hue
C. the average velocity of the flow
D. the color Doppler luminance -answer- B. the color Doppler hue
Color Hue - perceived color used to demonstrate direction (red and blue or positive and ...
SPI Mock Exam Questions and answers UPDATED 2024
The direction of the Doppler shift determines:
A. the peak velocity of the flow
B. the color Doppler hue
C. the average velocity of the flow
D. the color Doppler luminance -answer- ✔B. the color Doppler hue
Color Hue - perceived color used to demonstrate direction (red and blue or positive and
negative shift)
What is the primary factor that determines the resistance characteristics of the arterial
signal displayed by PW Doppler?
A. vessel course and location
B. branch number
C. part it is supplying
D. origin of blood -answer- ✔C. part it is supplying
Which of the following system adjustments would increase the size of the spectral
window?
A. changing from a 4mm to 2 mm sample size
B. decreasing rejection
C. tortuous vessel
D. changing from a 2mm to 4mm sample size -answer- ✔A. changing from a 4mm to
2mm sample size
Which of the following correctly describes an annular array?
A. improved temporal resolution is a primary advantage of annular arrays
B. offers excellent lateral resolution
C. produces a sector shaped field of view with a flat top
D. produces a trapezoid shaped field of view -answer- ✔B. offers excellent lateral
resolution
Which of the following correctly describes the specificity of a testing technique?
A. if the rest result is positive, specificity is the probability that the patient actually has
the disease
B. the ability of a test to detect disease when it is present
C. the ability of a test to rule out disease when it is not present
D. if the test result is negative specificity is the probability that the patient does not have
disease -answer- ✔C. the ability of a test to rule out disease when it is not present
Which of the following patients would need a guardian to sign an informed consent for a
pericardiocentesis?
A. a patient that is accompanied by a translator
B. a blind patient
C. a patient with Parkinson's disease
SPI Mock Exam Questions
,SPI Mock Exam Questions
D. a patient with Alzheimer's disease -answer- ✔D. a patient with Alzheimer's disease
The wider the element diameter, the
A. greater the beam divergence in the far field
B. lower the beam intensity
C. shorter the near zone
D. greater the probe frequency -answer- ✔B. lower the beam intensity
- intensity is power per unit area
- as area of beam increases - total power of beam is more spread out across larger area
= reduction in intensity
The best angle of insonation to produce the most accurate Doppler shift information is
______ degrees
A. 0
B. 45
C. 60
D. 90 -answer- ✔A. 0
________ compares each reflected echo to the same echo from a previous US pulse to
determine if motion is present
A. autocorrelation
B. temporal resolution
C. registration accuracy
D. quadrature detector -answer- ✔A. autocorrelation
________ artifact is caused by refraction and results in subtle image degradation
A. comet tail
B. multipath
C. scatter
D. misregistration -answer- ✔B. multipath
_______ is defined was the ratio of two sound intensities
A. sensitivity
B. dynamic range
C. decibel
D. duty factor -answer- ✔C. decibel
Which if the following techniques uses the highest intensity beam?
A. B mode
B. power Doppler
C. PW Doppler
D. M mode -answer- ✔C. PW Doppler
There is no known adverse biological effect in vivo using an unfocused ultrasound
transducer at intensities below:
SPI Mock Exam Questions
, SPI Mock Exam Questions
A. 1000 mW/cm^2 SATA
B. 1000 mW/cm^2 SPTA
C. 100 W/cm^2 SPTA
D. 100 mW/cm^2 SPTA -answer- ✔D. 100 mW/cm^2 SPTA
If the lines per frame increases and the depth remains the same, what other system
parameter must change for sound wave production?
A. propagation speed of the sound produced
B. signal to noise ratio
C. PRF
D. frequency -answer- ✔C. PRF
- if more scan lines are necessary, PRF must increase to produce more scan lines
When the Doppler tracing demonstrates a thin outline for a peaked waveform with a
large spectral window, this indicates:
A. high grade stenosis
B. a high Reynold's number
C. laminar flow
D. poor cardiac function -answer- ✔C. laminar flow
The Doppler shift is 5000Hz. The pulse repetition frequency is 9000Hz. Which of the
following is true?
A. the peak pressure gradient is 36 mmHg
B. range ambiguity will occur
C. aliasing will occur
D. the peak velocity is equal to 2 m/s -answer- ✔C. aliasing will occur
- Nyquist limit = 9000/2 = 4500
- Doppler shift is 5000Hz = exceeds nyquist limit
How many pulses are needed per scan line in order to generate a single frame of color
Doppler?
A. 16
B. 6
C. 1
D. 3 -answer- ✔D. 3
- 2D = 1 pulse/scan line
- color = 3-32 pulses/scan line
If the input power is 2mW and the output power is 200mW, what is the gain?
A. 10 dB
B. 30 dB
C. 100 dB
D. 20 dB -answer- ✔D. 20 dB
Which of the following is a limitation of Analog Doppler?
A. unable to detect post stenotic turbulence and spectral broadening
SPI Mock Exam Questions
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