URR SPI Questions With Correct
Answers.
Give the correct units for each:
circumference:
area:
volume: - answercircumference: cm
area: cm squared (cm^2)
volume: cm cubed (cm^3)
when PRP increases, frame rate .... - answerincreases
period X number of cycles in a pulse = - answerpulse duratio...
Give the correct units for each:
circumference:
area:
volume: - answer✔✔circumference: cm
area: cm squared (cm^2)
volume: cm cubed (cm^3)
when PRP increases, frame rate .... - answer✔✔increases
period X number of cycles in a pulse = - answer✔✔pulse duration
2D imaging is best when the beam is at a ___ degree angle to the structure - answer✔✔90 degree
Doppler evaluation is best when the flow is at a ____ degree angle to the ultrasound beam
(cursor) - answer✔✔0 degree
if you increase the beam frequency, then your spatial pulse length gets _______ (shorter or
longer) - answer✔✔shorter
if you decrease the transmit frequency, then the beam width will (increase or decrease) -
answer✔✔increase
when an image is frozen, an elipse can be used to measure the ____ of a structure -
answer✔✔area
the time it takes for one pulse to occur - answer✔✔pulse duration
wider dynamic range, means more shades of grey, and a (lower or higher) contrast -
answer✔✔lower
narrow dynamic range, means few shades of grey, and a (lower or higher) contrast -
answer✔✔higher
(low or high) frequency and (low or high) amplitude, will cause an increase in the mechanical
index and the risk for cavitation - answer✔✔low frequency, high amplitude
LCD monitor accept the digital signal and do not need a ..... - answer✔✔digital to analog
converter
flow is halved when length is - answer✔✔doubled
increased vessel length, increases resistance, which (increases or decreases) flow? -
answer✔✔decreases
_____ loss is associated with acceleration and deceleration - answer✔✔inertia
flow is halved when resistance is - answer✔✔doubled
true or false? a successful doppler exam may be performed regardless of hematocrit? -
answer✔✔true
maximum transmission will occur when a medium has an identical ______ as the initial medium
- answer✔✔impedance
snells law defines the physics of - answer✔✔refraction
reflection will always occur with different impedances AND _______ incidence -
answer✔✔perpendicular incidence
refraction will occur with different speeds and _____ incidence - answer✔✔oblique
dynamic range is a ______ measurement - answer✔✔relative
PACS systems are most likely to be _____ not analog - answer✔✔digital
means many gray shades - answer✔✔wide dynamic range
using a lens is a form of _____ focusing - answer✔✔transmit
dynamic aperature is a form of _____ focusing
(receive or transmit) - answer✔✔receive
to get a lower frequency, you need a (thinner or thicker) crystal - answer✔✔thicker
rarefaction does or does not interfere with the study of bioeffects - answer✔✔does not
what is the main thing that improves axial resolution? - answer✔✔shorter pulses
how is frequency related to PZT crystal thickness? - answer✔✔inversely
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