Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
tech does not have to pick length of exposure therefore does not pick mAs
|
AEC, phototiming
|
|
|
length of exposure means what
|
AEC is considered a timing device (can pick mA, doing so influences time)
|
|
|
if low mA is picked exposure will be
|
long
|
|
|
if high mA is picked exposure will be
|
short
|
|
|
if AEC is used techs can pick all what other technical factors
|
kV, focal spot, distance, field size
|
|
|
what are the most common errors when using AEC
|
incorrect positioning with regard to select chamber/cell, incorrect cell positioning
|
|
|
are the cells ionized chambers
|
yes
|
|
|
does radiation to the chambers create a charge
|
yes
|
|
|
t or f, depending on the body part selected, when the chamber reaches a predetermined charge, it will break the timing circuit and stop exposure
|
true
|
|
|
how are AEC systems calibrated
|
phantoms and then clinical trials
|
|
|
when multiple cells are used, the sum of all the cells selected is ____ by the ____ of cells in use. termination occurs when the desired charged is ____
|
divided, number, reached
|
|
|
where are the chambers
|
between the patient and ir, on the upright Bucky and table buckey
|
|
|
how many chambers chosen for KUB how many for PA chest
|
3, 2
|
|
|
what settings will adjust the amount of density seen on the image
|
density controls, -2, -1,N, +1,+2
|
|
|
chambers are calibrated to achieve ____ density in normal settings
|
optimal
|
|
|
do you change density controls for different body habiti, ex. asthenic to hypersthenic
|
no
|
|
|
timer set to avoid extreme over exposure in case of some sort of error, such as cell selection, positioning, ext
|
back up timer
|
|
|
if collimator is sitting over a selected cell, what will happen due to AEC trying to penetrate a dense body part
|
over exposure
|
|
|
excessive lack of collimation produced excess
|
scatter
|
|
|
if to many scatter photons reach the selected chamber the exposure will
|
terminate, EI number will indicate over exposure
|
