SPI PRACTICE QUESTIONS & VERIFIED CORRECT
ANSWERS. NEWEST 2024. ALREADY GRADED A+
_________ is a redirection of US in many directions as a result of a *rough* boundary
between two media - ANSscattering
___________ resolution is determined by SPL - ANSradial or axial
______________ is the distance covered by one cycle - ANSwavelength
______________ is the time to complete one cycle - ANSperiod
A circular hyperechoic structure is located at a depth of 5 cm. The structure has
abnormally low attenuation and the speed in the mass is 1,400 m/s. Which of the
following is most likely to appear beneath the structure? - ANSreflectors beneath the
structure appear abnormally deep in the image
A Doppler exam is performed with a 5 MHz probe and a PRF of 15 kHz. Which of these
Doppler shifts will create aliasing? - ANS14 kHz
A hydrophone is used to measure: - ANSintensity (or frequency)
A pulse is emitted by a transducer and is traveling in soft tissue. The go-return-time, or
time-of-flight, of a sound pulse is 130 microseconds. What is the reflector depth? -
ANS10 cm
A quality assurance program: - ANSis needed by all labs
A shadow appears on an ultrasound scan. Which of the following statements is true
about the shadow artifact? - ANSit appears as hypoechoic
A shadow appears on an ultrasound scan. Which of the following statements is true
about the structure immediately above the shadowing artifact? - ANSattenuation
properties are too high
A single element transducer is focused: - ANSby the manufacturer
A sound beam is created by a single, disc-shaped crystal. Which of these beams has
the shallowest focus? - ANS2 MHz, 9 mm diameter
A sound wave is traveling in the body and propagating from one form of soft tissue to
another. For example, sound is moving from muscle to blood. What percentage of the
sound wave is most likely to be reflected at the muscle-blood boundary? - ANS.5%
,A sound wave with a frequency of 5 MHz is travelling in soft tissue. What is the
wavelength? - ANS.3 mm
A sound wave's frequency is 10 MHz. The wave is traveling in soft tissue. What is its
wavelength? - ANS.15 mm
A system which is not working well now does not display clear images in the far field.
This may be a problem with: - ANStransducer, receiver, monitor, or scan converter
A transducer converts __________ from one form to another - ANSenergy
A transducer with more than one active element is called: - ANSarray
According to AIUM, there have been no confirmed bioeffects below intensities of
______ watts per square centimeter SPTA - ANS.01
Aliasing is an artifact observed when performing Doppler ultrasonography. Which of the
following signals is most likely to alias? - ANS7 MHz with a PRF of 3 kHz
All of the following are limitations of analog scan converts EXCEPT: - ANSlow spatial
resolution
All of the following are primarily used to change the overall brightness of an entire
image EXCEPT: - ANScompensation
All of the following are true EXCEPT: - ANStwo waves with identical frequencies must
interfere constructively
All of the following are true EXCEPT: - ANStwo waves with identical frequencies must
interfere constructively
All of the following are true of normal cavitation EXCEPT: - ANSharmful bioeffects are
commonly observed
All of the following are true regarding temporal resolution EXCEPT: - ANSdecreased
temporal resolution is associated with shorter pulse duration
All of the following artifacts place the erroneous reflection below the true reflector
EXCEPT: - ANSside lobe
All of the following describe dynamic range EXCEPT: logarithmic, comparison, relative,
absolute, ratio - ANSabsolute
All of the following regarding the hemodynamics of a stenosis are true EXCEPT: -
ANSpressure is lowest downstream
, All of the following result from the use of backing material in a transducer EXCEPT: -
ANShigh sensitivity
All of the following statements regarding in-vitro bioeffects are true EXCEPT: - ANSin-
vitro bioeffects conclusions are clinically relevant
All of the following will improve temporal resolution EXCEPT: - ANSincreased line
density
An image is too dark. Which technique is best to correct this problem? - ANSincrease
receiver gain
An individual is standing. The blood pressure generated by the heart is 120 mmHg.
What is the hydrostatic pressure at the ankle? - ANS100 mmHg
An ultrasound system is imaging to a depth of 10 cm. Which of the following will be
different on a single image at depths of 2 cm, 5 cm, and 10 cm? - ANSlateral resolution
An ultrasound system is operating in the harmonic mode. The image on the display of
the ultrasound system was created using sound reflections with a frequency of 6 MHz.
What is the frequency of sound emitted by the system's transducer? - ANS3 MHz
An ultrasound system is set at 0 dB and is transmitting at full intensity. What is the
output power when the system is transmitting at 10% of full intensity? - ANS-10 dB
An ultrasound system is set at 0 dB and is transmitting at full intensity. What is the
output power when the system is transmitting at 50% of full intensity? - ANS-3 dB
An ultrasound system's display is too bright. Which of the following techniques is best to
correct this problem? - ANSdecrease output power
An US machine has a digital scan converter, but has an analog input signal. The
machine needs to have a: - ANSanalog to digital converter
An US wave travels through two media and has attenuation of 3 dB in the first and 5 dB
in the second. What is the total attenuation? - ANS8 dB
As a result of ______________, the propagation speed increases - ANSdecreasing
compressibility and density
As the impedance of two media become vastly different , the: - ANSreflection increases
Assuming a constant frequency, what happens if the diameter of an unfocused circular
transducer is increased? - ANSthe beam width in the near field is increased
At the focus, the beam diameter is __________ the transducer diameter - ANShalf
ANSWERS. NEWEST 2024. ALREADY GRADED A+
_________ is a redirection of US in many directions as a result of a *rough* boundary
between two media - ANSscattering
___________ resolution is determined by SPL - ANSradial or axial
______________ is the distance covered by one cycle - ANSwavelength
______________ is the time to complete one cycle - ANSperiod
A circular hyperechoic structure is located at a depth of 5 cm. The structure has
abnormally low attenuation and the speed in the mass is 1,400 m/s. Which of the
following is most likely to appear beneath the structure? - ANSreflectors beneath the
structure appear abnormally deep in the image
A Doppler exam is performed with a 5 MHz probe and a PRF of 15 kHz. Which of these
Doppler shifts will create aliasing? - ANS14 kHz
A hydrophone is used to measure: - ANSintensity (or frequency)
A pulse is emitted by a transducer and is traveling in soft tissue. The go-return-time, or
time-of-flight, of a sound pulse is 130 microseconds. What is the reflector depth? -
ANS10 cm
A quality assurance program: - ANSis needed by all labs
A shadow appears on an ultrasound scan. Which of the following statements is true
about the shadow artifact? - ANSit appears as hypoechoic
A shadow appears on an ultrasound scan. Which of the following statements is true
about the structure immediately above the shadowing artifact? - ANSattenuation
properties are too high
A single element transducer is focused: - ANSby the manufacturer
A sound beam is created by a single, disc-shaped crystal. Which of these beams has
the shallowest focus? - ANS2 MHz, 9 mm diameter
A sound wave is traveling in the body and propagating from one form of soft tissue to
another. For example, sound is moving from muscle to blood. What percentage of the
sound wave is most likely to be reflected at the muscle-blood boundary? - ANS.5%
,A sound wave with a frequency of 5 MHz is travelling in soft tissue. What is the
wavelength? - ANS.3 mm
A sound wave's frequency is 10 MHz. The wave is traveling in soft tissue. What is its
wavelength? - ANS.15 mm
A system which is not working well now does not display clear images in the far field.
This may be a problem with: - ANStransducer, receiver, monitor, or scan converter
A transducer converts __________ from one form to another - ANSenergy
A transducer with more than one active element is called: - ANSarray
According to AIUM, there have been no confirmed bioeffects below intensities of
______ watts per square centimeter SPTA - ANS.01
Aliasing is an artifact observed when performing Doppler ultrasonography. Which of the
following signals is most likely to alias? - ANS7 MHz with a PRF of 3 kHz
All of the following are limitations of analog scan converts EXCEPT: - ANSlow spatial
resolution
All of the following are primarily used to change the overall brightness of an entire
image EXCEPT: - ANScompensation
All of the following are true EXCEPT: - ANStwo waves with identical frequencies must
interfere constructively
All of the following are true EXCEPT: - ANStwo waves with identical frequencies must
interfere constructively
All of the following are true of normal cavitation EXCEPT: - ANSharmful bioeffects are
commonly observed
All of the following are true regarding temporal resolution EXCEPT: - ANSdecreased
temporal resolution is associated with shorter pulse duration
All of the following artifacts place the erroneous reflection below the true reflector
EXCEPT: - ANSside lobe
All of the following describe dynamic range EXCEPT: logarithmic, comparison, relative,
absolute, ratio - ANSabsolute
All of the following regarding the hemodynamics of a stenosis are true EXCEPT: -
ANSpressure is lowest downstream
, All of the following result from the use of backing material in a transducer EXCEPT: -
ANShigh sensitivity
All of the following statements regarding in-vitro bioeffects are true EXCEPT: - ANSin-
vitro bioeffects conclusions are clinically relevant
All of the following will improve temporal resolution EXCEPT: - ANSincreased line
density
An image is too dark. Which technique is best to correct this problem? - ANSincrease
receiver gain
An individual is standing. The blood pressure generated by the heart is 120 mmHg.
What is the hydrostatic pressure at the ankle? - ANS100 mmHg
An ultrasound system is imaging to a depth of 10 cm. Which of the following will be
different on a single image at depths of 2 cm, 5 cm, and 10 cm? - ANSlateral resolution
An ultrasound system is operating in the harmonic mode. The image on the display of
the ultrasound system was created using sound reflections with a frequency of 6 MHz.
What is the frequency of sound emitted by the system's transducer? - ANS3 MHz
An ultrasound system is set at 0 dB and is transmitting at full intensity. What is the
output power when the system is transmitting at 10% of full intensity? - ANS-10 dB
An ultrasound system is set at 0 dB and is transmitting at full intensity. What is the
output power when the system is transmitting at 50% of full intensity? - ANS-3 dB
An ultrasound system's display is too bright. Which of the following techniques is best to
correct this problem? - ANSdecrease output power
An US machine has a digital scan converter, but has an analog input signal. The
machine needs to have a: - ANSanalog to digital converter
An US wave travels through two media and has attenuation of 3 dB in the first and 5 dB
in the second. What is the total attenuation? - ANS8 dB
As a result of ______________, the propagation speed increases - ANSdecreasing
compressibility and density
As the impedance of two media become vastly different , the: - ANSreflection increases
Assuming a constant frequency, what happens if the diameter of an unfocused circular
transducer is increased? - ANSthe beam width in the near field is increased
At the focus, the beam diameter is __________ the transducer diameter - ANShalf
