URR Abdomen Physics & Clinical Questions And Answers Latest Updates
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URR Abdomen Physics & Clinical
Institution
URR Abdomen Physics & Clinical
Color Doppler demonstrates (x2) - average velocity & direction of flow
Which artifacts will be seen with needles? (x3) - - Propagation speed artifact
- Reverberation AKA resonance artifact
- Bayonet artifact
What happens if you decrease the color threshold? - reduce the color displayed
- color...
For renal artery doppler evaluation, the angle should be _____. For intraparenchymal arteries, the angle
should be _____. - - main RA = <60
- intraparenchymal = <20
Increasing _____ will most improve the ability to properly trace the contour of Doppler waveform. -
Sweep speed
A simple cyst could have artifactual debris in it in case of (x2) - - short distance from the
transducer
- volume averaging
,A contrast agent that consists of a cellulose suspension can better visualize which organ? -
pancreatic tail
Which artifact occurs when sampling vessels adjacent to a highly reflective structure like a bone? -
Cross talk
- mirror image of the waveform on the other side of the baseline
Harmonic imaging increase (x3) and decrease (x3) - Increase
- spatial resolution
- contrast resolution
- signal to noise ratio
Decrease
- reverberation
- beam aberration
- side lobes
If you have trapezoidal field of view on linear array, which resolution are you degrading? - lateral
resolution
- Trapezoidal = 台形
- wider beams = less lateral resolution
The number of lines of information used to create the color displayed on the image is called -
Packet size
- increase packet size = increase color display
Sample angle controls the amount of color fill in a vessel evaluated with color Doppler. T/F - True
- angle DOES matter to color filling
, File type for PACS system - DICOM = Digital Imaging & Communications in Medicine
Name of transducer; order of the term in the name - 1. Shape of the transducer comes first
2. phased/sequential comes second
e.g.
- sector phased array
- linear sequential array
The bayonet artifact is - a type of propagation speed error, the tip of the needle appears curved
When you are scanning MSK, you see this artifact; if the transducer is not parallel to the _____, it falsely
appears hyperechoic/hypoechoic. - Anisotropy
- scanning tendon
- appears falsely hypoechoic (hypo=abnormal)
- rock the transducer to make it parallel to the tendon
How do you reduce the clutter/flash on a color Doppler image? - Decrease color
priority/threshold
In case of contrast live ultrasound, the mechanical index should be ______. Then turn on _____, and
focal zone should be placed at ______ - - Mechanical Index = low (<1.0) → prevent cavitation of
microbubbles
- turn on harmonics
- focal zone at the area of interest
Specular reflection occurs with - a large smooth structure = diaphragm
- echogenic appearance
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