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SPI Exam: Part 4 (Pulse-Echo Instrumentation) (Questions and answers) LATEST UPDATE
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While performing a sonographic examination, you have performed both preprocessing and postprocessing functions. Which of the following functions is postprocessing? A. Write-zoom magnification B. Frequency change C. Gray-scale map assignment D. Scan line density E. Acoustic power output - ️�...

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  • October 29, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • spi exam part 4 pulse echo instrumentation

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SPI Exam: Part 4 (Pulse-Echo
Instrumentation)
While performing a sonographic examination, you have performed both preprocessing
and postprocessing functions. Which of the following functions is postprocessing?

A. Write-zoom magnification
B. Frequency change
C. Gray-scale map assignment
D. Scan line density
E. Acoustic power output - ✔️✔️C

You have chosen to enlarge an ultrasound image with a read magnification. Which of
the following is NOT related to read magnification?

A. Preprocessing
B. Increased pixel size
C. Performance on a frozen image
D. Resolution loss
E. B and D only - ✔️✔️A



What system control determines the amount of amplification that occurs in the receiver?

A. Gain
B. Acoustic power output
C. Rectification
D. Pulse repetition frequency
E. Dynamic range - ✔️✔️A

When you adjust the output power control, you affect the following system component:

A. Pulser
B. Beam former
C. Scan converter
D. Memory
E. Receiver - ✔️✔️A

What system control do you adjust to equalize the differences in echo amplitudes
received from similar structures situated at different depths?

A. Dynamic range or compression

,B. Rectification
C. Time gain compensation
D. Pulse repetition frequency
E. Rejection - ✔️✔️C

Electronic noise is reduced in the ultrasound system by this method:

A. Demodulation
B. Compensation
C. Rectification
D. Amplification
E. Rejection - ✔️✔️E


What system control should vou adiust to compensate for sound attenuation with
increasing depth?

A. Dynamic range
B. TGC
C. Transmit power
D. Overall receiver gain
E. Focus position - ✔️✔️B

What term below describes the rate at which the transmitter applies electronic voltage
pulses to the transducer?

A. Period
B. Pulse repetition frequency
C. Depth gain compensation
D. Demodulation
E. Apodization - ✔️✔️B

Pulsing of the transmitted sound wave is necessary for real-time imaging because:

A. The transducer becomes too hot to handle if continuous sound waves are emitted.
B. The crystal in the transducer will break under the stress of continuous emissions.
C. The depth of the interface from which the echo originated can be determined.
D. Lateral resolution is improved by pulsed transmission.
E. Temporal resolution is improved by pulsed transmission. - ✔️✔️C

What receiver function is responsible for decreasing the difference between the smallest
and largest received signal amplitudes?

A. Amplification
B. Compensation
C. Compression

,D. Demodulation
E. Rejection - ✔️✔️C



Which of the following would be most helpful to enhance the contrast difference
between tissues having subtle variations in echogenicity?

A. Decreasing the acoustic power output B. Decreasing the scan line density
C. Performing a read-zoom magnification over the area of interest
D. Changing the gray-scale map assignment
E. Increasing the overall receiver gain - ✔️✔️D

What part of the sonographic instrument is responsible for apodization, beam steering,
focusing, and aperture control?

A. Beam former
B. Receiver
C. Memory
D. Pulser
E. Scan converter - ✔️✔️A

You are performing a sonographic examination and select the tissue harmonics
operating mode, What advantage will you obtain over conventional imaging?

A. Improved contrast resolution
B. Improved penetration
C. Improved temporal resolution
D. Improved signal-to-noise ratio
E. Increased bandwidth - ✔️✔️A

You have decreased the scan line density. What technique will be employed to fill in the
empty data between the scan lines?

A. Interpolation
B. Rejection
C. Compression
D. Autocorrelation
E. Demodulation - ✔️✔️A

While performing an ultrasound examination, you decide to adjust the system settings to
improve the image. Which of the following is NOT user- adjustable?

A. Frequency
B. Power
C. Gain

, D. Compression
E. Echo arrival time - ✔️✔️E

What control should you adjust to optimize the image if you are scanning a structure
that produces very bright echoes on the display?

A. Rejection
B. TGC
C. Edge enhancement
D. Frame averaging (persistence)
E. Frequency - ✔️✔️B

To generate a sonographic image, what is the order in which the following system
components are activated?

A. Pulser, receiver, display, beam former, memory
B. Pulser, beam former, receiver, memory, display
C. Beam former, pulser, memory, display, receiver
D. Memory, beam former, pulser, receiver, display
E. Beam former, memory, pulser, receive, display - ✔️✔️B

What control should you adiust to better compensate for the attenuation or sound as it
propagates through tissue?

A. Dynamic range
B. Time gain compensation
C. Acoustic power output
D. Rejection
E. Focusing - ✔️✔️B

Which control would you adiust to increase the intensity of the transmitted pulse?

A. Receiver gain
B. Depth of scanning
C. Output power
D. Time gain compensation
E. Dynamic range - ✔️✔️C

Which control would you adjust to alter the dynamic range of the displayed echoes?

A. Compression
B. Transmit power
C. Scanning depth
D. Time gain compensation
E. Focusing - ✔️✔️A

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