Details

Title: Abdominal Doppler

Description: For diagnostic medical sonography students. Only study term first, then definition. More of a Q&A than term/definition.

Total Flash Cards: 23

Created: 03/18/2009 15:08:04

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Additional Medical Flashcards

Cards in this set:

Term
What type of flow is retrograded?
 Definition
hepatofugal
Term
What type of flow is antegraded?
 Definition
hepatopetal
Term
In what organs is high resistive flow normal?
 Definition
ECA, upper and lower extremities, and pre prandial SMA
Term
What does dynamics mean?
 Definition
flow
Term
What are the three parts to a high resistive wave?
 Definition
1. systolic peak 2. flow reversal 3. brief forward phase
Term
When do extremities have low resistive waveforms?
 Definition
after exercise
Term
In what type of flow does blood accelerate and decelerate from cardiac contractions?
 Definition
pulsatile
Term
In what type of flow does blood move with a variable velocity accelerated and decelerates from respiration?
 Definition
phasic
Term
What type of flow is venous with held respiration?
 Definition
steady
Term
Type of flow in which streamlines are straight and parallel.
 Definition
laminar
Term
What are the two types of laminar flow?
 Definition
plug and parabolic
Term
In what type of laminar flow is the velocity profile relatively constant across the entire vessel, moving as a unit?
 Definition
plug
Term
What type of laminar flow has flow shaped like a parabola or a bullet across the vessel?
 Definition
parabolic
Term
What causes parabolic flow?
 Definition
friction on walls
Term
Forward flow, but not always in a straight line.
 Definition
disturbed flow
Term
When fluid moves in a chaotic random course.
 Definition
turbulent flow
Term
How is energy converted in turbulent flow?
 Definition
as sound and vibrations (bruit and murmur)
Term
(difference) change in frequency or
wavelength of echo signals that occur when there is a relative motion between the transducer (sound source) and reflecting surface (red blood cells)
 Definition
doppler effect
Term
What is the worst doppler angle?
 Definition
90 degrees
Term
Result of going over the Nyquist limit.
 Definition
aliasing
Term
How do you correct aliasing artifact?
 Definition
increase PRF or velocity scale
Term
Visual inspection
 Definition
qualitative
Term
Measurements done mathmatically
 Definition
quantitative