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PHYSICS SPI EXAM ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | UPDATED
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PHYSICS SPI EXAM ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | UPDATED
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PHYSICS SPI EXAM ACTUAL QUESTIONS ANDANSWERS 100% CORRECT | UPDATED 2024-2025
When sound hits a boundary between two media of the same propagation speed
at oblique incidence: - ANSWER 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: - ANSWER axial and lateral resolution will
increase
Blood flow volume changes in the body are mainly controlled by what two
factors? - ANSWER cardiac function and peripheral resistance
When referring to blood flow volume throughout the body, the best answer to the
question is cardiac function and vessel resistance.
Potential bioeffects of ultrasound can be minimized by which of the following? -
ANSWER reduce exam time
Reducing overall exam time will reduce patient exposure. Adhering to the ALARA
principle will also reduce exposure by limiting power output adjustments and
using TGC controls instead. The other choices have no effect on intensity.
Which of the following types of resolution varies with different depths on the
image? - ANSWER lateral resolution
,Lateral resolution is improved at the focal zone and in the near field compared to
the far field.
Transmit Delay or Receive Focusing improves _____________________
resolution. - ANSWER angular and azimuthal
Azimuthal and angular resolution refer to lateral resolution. Lateral resolution is
improved with a thinner beam. Focusing forms a thinner beam in the focal zone,
therefore focusing improves the lateral resolution.
Which of the following is NOT adjustable by the Sonographer? - ANSWER
Demodulation
Demodulation occurs as the signal is converted into positive voltages
(rectification) and smoothed across the peaks of the voltage pulses. This process
assists in processing the voltages for proper image display of the returned signals.
This is a preset function of the US system and not operator adjustable.
To obtain a longer near zone: - ANSWER change from a 3MHz to a 6MHz
transducer.
Higher frequency and larger element diameter probes provide the longest near
zones.
The matching layer for a transducer is usually made of plastic and is approximately
________________ . - ANSWER 1/4 of the probe wavelength in thickness
, The matching layer for a transducer is usually made of plastic and is approximately
1/4 of the probe wavelength in thickness.
Lateral resolution is best at what location in the beam? - ANSWER focal point
If the ultrasound image is too black and white, which of the following will add
more levels
of grey to the image? - ANSWER decrease rejection levels
Rejection is used to reduce the amount of low level echoes displayed on the
image. If the image is too black and white, reducing the rejection level will allow
more low level echoes to be displayed on the image. This will decrease the black
and white appearance and increase the levels of grey displayed.
_______________ is defined as the time it takes to complete one cycle. -
ANSWER Period
Period is defined as the time it takes to complete one cycle.
The ability to differentiate a hyperechoic hemangioma within the hypoechoic liver
tissue is due to what type of image resolution? - ANSWER contrast resolution
Contrast resolution refers to the ability to differentiate different intensities
(shades of black, white and grey) on the ultrasound image. Compression can be
used to alter the dynamic range of the image which affects the contrast. Lower
compression = larger dynamic range = improved contrast resolution = lower image
contrast = more shades of gray on the image
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