SPI PRACTICE EXAM 2025 With Correct
Answers
The typical frame rate of an Ultrasound system is? - correct answer Between 30 Hz and 100 Hz
d d d d d d d d d d d d d d d d d
Temporal resolution is synonymous with frame rate. Typical frame rates in imaging systems are 30-100 Hz. -
d d d d d d d d d d d d d d d d d
correct answer The temporal resolution or frame rate = 1/(time to scan 1 frame). Frame rate can drop down to
d d d d d d d d d d d d d d d d d d d d
5 Hz.
d
Pulse duration is related to bandwidth how? - correct answer Pulse Duration = 1 / Bandwidth
d d d d d d d d d d d d d d d
Specular reflectors have physical dimensions that are what size in relation to the wavelength? - correct answer
d d d d d d d d d d d d d d d d d
Greater
Two identical systems produce a pulse. One pulse is 0.8 usec in duration while the other is 1.4 usec. The best
d d d d d d d d d d d d d d d d d d d d d
radial resolution will be created by which system? - correct answer 0.8 Pulse duration (length of pulse) With a
d d d d d d d d d d d d d d d d d d d
short pulse duration we have a small pulse length. The shorter the SPL the better the longitudinal resolution.
d d d d d d d d d d d d d d d d d
To achieve better depth (axial) resolution. You must have what? - correct answer FEWER CYCLES PER PULSE -
d d d d d d d d d d d d d d d d d
Axial resolution = SPL / 2 or # cycles in the pulse x wavelength / 2
d d d d d d d d d d d d d d d
, d - correct answer
d d d
Ultrasound wave attenuation is denoted by which units? - correct answer dB (DECIBELS) d d d d d d d d d d d d
If it takes 1/20 of a second to construct a single frame, what is the current frame rate? - correct answer 20 hz--
d d d d d d d d d d d d d d d d d d d d d d
Hz = cycles per second. The rate is 1/20th of a second. So 20 cycles per second = 20 Hz
d d d d d d d d d d d d d d d d d d d
With a focused ultrasound beam, bioeffects...? - correct answer Are less likely to occur
d d d d d d d d d d d d d
The smaller the beam the less likelihood of cavitation. Exam duration has the greatest effect on patient
d d d d d d d d d d d d d d d d d
exposure. - correct answer Bioeffects intensity limit: SPTA >100 mW/cm2 Unfocused >1 W/cm2 or 1000
d d d d d d d d d d d d d d d
mW/cm2 Focused d
HIGHEST output intensities used with pulsed doppler. - correct answer Lowest output intensities are with
d d d d d d d d d d d d d d d
gray-scale imaging. d
With which type of array are grating lobes most common? - correct answer Linear array
d d d d d d d d d d d d d d
Which equation is used to find the doppler shift? - correct answer Fd = 2 Fi v / c
d d d d d d d d d d d d d d d d d d
In standard diagnostic imaging instrumentation, which has the higher numerical value? - correct answer
d d d d d d d d d d d d d d
Lateral Resolution-LATA= higher numerical value LARD = smaller value
d d d d d d d d
Reflectors that are closer together than the width of the beam create what artifact? - correct answer Pulse
d d d d d d d d d d d d d d d d d d
Width artifact-Also known as lateral resolution artifact and beam width artifact.
d d d d d d d d d d
Basically they are shown as a single point because the resolution of the image - correct answer is only as good
d d d d d d d d d d d d d d d d d d d d d
as the minimal thickness of the beam at that depth.
d d d d d d d d d
As a wave propagates, the period will? - correct answer Not Change
d d d d d d d d d d d
Answers
The typical frame rate of an Ultrasound system is? - correct answer Between 30 Hz and 100 Hz
d d d d d d d d d d d d d d d d d
Temporal resolution is synonymous with frame rate. Typical frame rates in imaging systems are 30-100 Hz. -
d d d d d d d d d d d d d d d d d
correct answer The temporal resolution or frame rate = 1/(time to scan 1 frame). Frame rate can drop down to
d d d d d d d d d d d d d d d d d d d d
5 Hz.
d
Pulse duration is related to bandwidth how? - correct answer Pulse Duration = 1 / Bandwidth
d d d d d d d d d d d d d d d
Specular reflectors have physical dimensions that are what size in relation to the wavelength? - correct answer
d d d d d d d d d d d d d d d d d
Greater
Two identical systems produce a pulse. One pulse is 0.8 usec in duration while the other is 1.4 usec. The best
d d d d d d d d d d d d d d d d d d d d d
radial resolution will be created by which system? - correct answer 0.8 Pulse duration (length of pulse) With a
d d d d d d d d d d d d d d d d d d d
short pulse duration we have a small pulse length. The shorter the SPL the better the longitudinal resolution.
d d d d d d d d d d d d d d d d d
To achieve better depth (axial) resolution. You must have what? - correct answer FEWER CYCLES PER PULSE -
d d d d d d d d d d d d d d d d d
Axial resolution = SPL / 2 or # cycles in the pulse x wavelength / 2
d d d d d d d d d d d d d d d
, d - correct answer
d d d
Ultrasound wave attenuation is denoted by which units? - correct answer dB (DECIBELS) d d d d d d d d d d d d
If it takes 1/20 of a second to construct a single frame, what is the current frame rate? - correct answer 20 hz--
d d d d d d d d d d d d d d d d d d d d d d
Hz = cycles per second. The rate is 1/20th of a second. So 20 cycles per second = 20 Hz
d d d d d d d d d d d d d d d d d d d
With a focused ultrasound beam, bioeffects...? - correct answer Are less likely to occur
d d d d d d d d d d d d d
The smaller the beam the less likelihood of cavitation. Exam duration has the greatest effect on patient
d d d d d d d d d d d d d d d d d
exposure. - correct answer Bioeffects intensity limit: SPTA >100 mW/cm2 Unfocused >1 W/cm2 or 1000
d d d d d d d d d d d d d d d
mW/cm2 Focused d
HIGHEST output intensities used with pulsed doppler. - correct answer Lowest output intensities are with
d d d d d d d d d d d d d d d
gray-scale imaging. d
With which type of array are grating lobes most common? - correct answer Linear array
d d d d d d d d d d d d d d
Which equation is used to find the doppler shift? - correct answer Fd = 2 Fi v / c
d d d d d d d d d d d d d d d d d d
In standard diagnostic imaging instrumentation, which has the higher numerical value? - correct answer
d d d d d d d d d d d d d d
Lateral Resolution-LATA= higher numerical value LARD = smaller value
d d d d d d d d
Reflectors that are closer together than the width of the beam create what artifact? - correct answer Pulse
d d d d d d d d d d d d d d d d d d
Width artifact-Also known as lateral resolution artifact and beam width artifact.
d d d d d d d d d d
Basically they are shown as a single point because the resolution of the image - correct answer is only as good
d d d d d d d d d d d d d d d d d d d d d
as the minimal thickness of the beam at that depth.
d d d d d d d d d
As a wave propagates, the period will? - correct answer Not Change
d d d d d d d d d d d
