Physics SPI Exam Questions And Answers
When sound hits a boundary between two media of the same
propagation speed at oblique incidence: -
correct 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: -
correct answer ✅axial and lateral resolution will increase
Blood flow volume changes in the body are mainly controlled by
what two factors? -
correct 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? -
correct answer ✅reduce exam time
Reducing overall exam time will reduce patient exposure. Adhering
to the ALARA principle will also reduce exposure by limiting power
,Physics SPI Exam Questions And Answers
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? -
correct 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. -
correct 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? -
correct answer ✅Demodulation
, Physics SPI Exam Questions And Answers
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: -
correct 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 ________________ . -
correct 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? -
correct answer ✅focal point
When sound hits a boundary between two media of the same
propagation speed at oblique incidence: -
correct 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: -
correct answer ✅axial and lateral resolution will increase
Blood flow volume changes in the body are mainly controlled by
what two factors? -
correct 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? -
correct answer ✅reduce exam time
Reducing overall exam time will reduce patient exposure. Adhering
to the ALARA principle will also reduce exposure by limiting power
,Physics SPI Exam Questions And Answers
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? -
correct 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. -
correct 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? -
correct answer ✅Demodulation
, Physics SPI Exam Questions And Answers
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: -
correct 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 ________________ . -
correct 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? -
correct answer ✅focal point
