sonography lecture
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| anastamosis | connection of the two hollow or tubular structures
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| aneurysm | localized balloon like enlargement of an artery
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| atheroma | fatty deposit within an arterial wall
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| atherosclerosis | hardening and narrowing of arteries due to plaque build-up
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| arteriosclerosis | abnormal hardening of arterial walls
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| bifurcation | having two branches or divisions, forked
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| lumen | channel or opening within the vessel through which blood flows
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| occlusion | closed state or blockage
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| plaque | build up of cholesterol or fat within the arterial wall
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| stenosis | abnormal narrowing of vessel
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| syncope | brief loss of consciousness caused by cerebral hypoxia, loos of oxygen
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| tortuous | having many twists or turns
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| thrombus | blood clot attached to interior wall of a vein or artery
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| anechoic | without echoes, ex. blood
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| hypoechoic | low level echoes, ex. thyroid
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| hyperechoic | high level of echoes, ex. bone
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| homogeneous | all the same level of echoes
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| heterogeneous | many different echo levels
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| doppler | evaluation of the presence, speed and character of blood flow within the vessels
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| aliasing | the wrapping around of the spectral waveform that can result from high velocity of blood flow, nyquist limit is exceeded
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| overall gain | when the image is too dark to too light overall
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| focus | this optimizes your gray scale image by providing a clearer image, and optimizing your color image as well
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| doppler angle | this should be set between 45 and 60 degrees to achieve an accurate velocity measurement
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| sample volume gate (SVG) | should be placed midstream (center of the vessel) angle cursor parallel to the blood flow and the gate set between 1.5-2 mm
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| wall filter | will increase or decrease echoes present due to wall thumping *always set on low
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| heal-toe rocking | this is important to do when a vessel is perpendicular to the beam and runs horizontal across the beam
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| doppler gain | adjust the overall gray scale of the doppler spectral wave form
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| doppler effect | a shift in frequency caused by motion ( moving RBC's) *sound of train from far away to close to you
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| doppler | acceleration to deceleration to diacrotic notch to peak velocity to boundary layer(envelope) to diastole
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| sweep speed | changes spped of the doppler spectral display
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| doppler gain | knob that controls the strength of the doppler signal displayed
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| PRF (pulse repetition frequency) | if low, doppler aliases....if high, signal is too small to assess
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| baseline | controls level of baseline on the spectral doppler display
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| invert | switch inversts doppler signal from above to below the baeline
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To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
lgibbs
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