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Fund of Scanning

Instrumentation/ Patient Prep

pulser provides electrical stimulation to the transducer
transducer converts energies from one form to another (electrical to mechanical & back)
Piezoelectric effect mechanical deformation of crystals
receiver gathers info from the transducer to be processed
display shows image on monitor
depth allows changes in location of the image from deep to superficial
focus allows enhanced resolution to specific areas (carets)
gain overall brightness/darkness of the image
TGC compensates for attenuation; controls brightness/darkness of specific areas
dynamic range contrast of the image; log compressions displayed in decibels
cineloop ability to replay real-time images
A-mode (amplitude mode) spikes that represent strength of echo returning to machine
B-mode (brightness mode) displayed as shades of gray
M-mode (motion mode) represents motion of the B-mode image displayed as a graph
frame rate represents how often an image is updated
pixels digital memory matrix of image; gray scale we see on screen; typical machine has 512x512 matrix
Abdominal scan prep NPO at least 8 hrs prior
Pelvic exam prep 32 oz of water prior to fill bladder
Vascular scan prep NPO at least 8 hrs prior for abdominal vessels
Cardiac scan prep no prep needed
near gain controls brightness at top of image
far gain controls brightness at bottom of image
near zone concentrates sound beam at the top of the image
far zone concentrates sound beam at the bottom of the image
annotation should list: scan orientation, organ of interest, & location
Created by: ginaliane
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