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URR Abdomen Physics & Clinical Questions And Answers Latest Updates
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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...

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  • September 16, 2024
  • 16
  • 2024/2025
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  • urr abdomen physics clinical

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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 threshold AKA priority

- increase threshold if you don't see enough color



If the entire image is too bright, what do you do first? - decrease the output power

reverberation artifact due to gas production AKA _______ artifact - resonance artifact



lower frame rate = increased/degraded temporal resolution - degraded temporal resolution



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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