SPI Mock Registry Exam A20
reflected signals must undergo compression b/c the _______ of reflected signals __________ the ability of the system to process/display that many signals, & it is important to maintain gray scale w/in range of _______ ___________. - ANSWER-range; exceeds; human vision
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SPI Mock Registry Exam A20
reflected signals must undergo compression b/c the _______ of reflected signals __________ the ability
of the system to process/display that many signals, & it is important to maintain gray scale w/in range of
_______ ___________. - ANSWER-range; exceeds; human vision
the amount of compensation necessary for different echoes varies w/: - ANSWER-reflector depth
when evaluating a suspected arterial stenosis, a Doppler angle of _____ degrees will produce the MOST
accurate flow velocity. - ANSWER-0
term defined as specific area/location where Doppler shift info is being obtained - ANSWER-sample
volume
this reduces the beam width to the most narrow beam at all possible depths by controlling the # of
elements that are listening for reflections at 1 time. what kind of resolution does this optimize? -
ANSWER-dynamic receive focusing; lateral resolution
if an ellipse is used to document the area of a structure, what unit will be used to report the
measurement? (cm) - ANSWER-cm^2
which of these pts would need a guardian to sign an informed consent form for a pericardiocentesis?
a) pt w/ Parkinson's disease
b) pt w/ Alzheimer's disease
c) pt that is accompanied by a translator
d) blind pt - ANSWER-b) pt w/ Alzheimer's disease
it BP increases w/ constant resistance, the rate of blood flow will _________. If BP increases w/ an equal
increase in resistance, the rate of blood flow remains ________. - ANSWER-increase; unchanged
this is the perceived color used to demonstrate direction, reds & blues; determined by direction
(positive/negative) of the shift - ANSWER-color hue
,this is the brightness of a color that is displayed; determined by the amplitude of the reflection -
ANSWER-luminance
the direction of the Doppler shift determines:
a) peak velocity of flow
b) color Doppler luminance
c) avg velocity of flow
d) color Doppler hue - ANSWER-d) color Doppler hue
temporal resolution will improve w/ ________ # of focal zones, _______ FOV, & _________ image depth
& line density - ANSWER-decreased; smaller; decreased
which of these console adjustments will improve temporal resolution on an image?
a) turning on harmonic imaging
b) decreasing imaging depth
c) adding another focal zone
d) turning off the zoom function - ANSWER-b) decreasing imaging depth
this is the primary factor that determines the resistance characteristics of an arterial signal displayed by
PW Doppler:
a) origin of blood
b) branch #
c) vessel course & location
d) part it is supplying - ANSWER-d) part it is supplying
to increase the amplitude of an u/s pulse produced by a transducer, the:
a) voltage amplitude from the pulser must increase
b) # of PZT elements must increase
c) size of PZT elements must increase
, d) voltage amplitude from the pulser must decrease - ANSWER-a) voltage amplitude from the pulse must
increase
this compares each reflected echo to the same echo from a previous u/s pulse to determine if motion is
present & generates a frame of color Doppler - if motion is detected, color is displayed in that area on
the frame - ANSWER-autocorrelation
this compares each reflected echo to the same echo from a previous u/s pulse to determine if motion is
present - ANSWER-autocorrelation
this is the amount of usable signal available for image creation: - ANSWER-signal to noise ratio
which of these will NOT change w/ an increase in gain settings?
a) signal to noise ratio
b) # of echoes displayed
c) brightness of image
d) reflection amplitude - ANSWER-a) signal to noise ratio
what artifact is produced by interference of reflected waves from many tiny reflectors? - ANSWER-
speckle
this artifact causes a granular appearance of a homogeneous structure & is seen w/ lower frequency
transducers, typically associated w/ liver, spleen, kidney, THY parenchyma, etc. - ANSWER-speckle
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