Beam
If increased kVp is accompanied by an adequate reduction in ______, a reduction in scatter production will be realized.
mAs
Increased kVp has what effect on the production of scatter?
Increases it
Scatter that impacts the IR produces what kind of radiographic contrast?
Low contrast
Decreasing part thickness has what effect on scatter production?
Decrease
Increased beam restriction produces an image with:
higher contrast
What part of the beam forms the image?
The remnant beam
Increased beam- restriction has what effect on image brightness?
Has no effect
Which component of the collimator serves as about 1mm Al/Eq of filtration?
Mirror
Which component of a collimator serves to reduce off focus radiation?
Upper shutters
Which beam-restricting device is the most commonly used and offers an unlimited number of field sizes?
Collimator
During an exposure, the primary beam will either _______ or ______.
transmit without interaction, be attenuated
Of the factors affecting the amount of scatter produced, _______ and ______ are under the direct control of the radiographer.
kVp, field size
What is automatic collimation known as?
Positive Beam Limitation
Which beam restricting device is simply a piece of metal with a hole in it, attached to the port?
Aperture diaphragm
What device is used to help prevent scatter from striking the IR.
grid
When using AEC, the actual mAs the tube used for the exposure is ____.
Displayed after the exposure has terminated.
AEC chambers are filled with:
gas
When using an AEC technique, if the patient is positioned with more dense tissue, than the tissue of interest, over the activated chamber, the Exposure Index will indicate the IR was:
over exposed IR
When using an AEC technique, if the patient is positioned with less dense tissue, than the tissue of interest, over the activated chamber, the result will be:
under exposed IR
Early versions of AEC technology were referred to as
phototimers
When setting a manual technique, the radiographer must select which of the following?
mA
s
kVp
When an AEC is used for a lateral chest, which ionization chambers are utilized?
center cell
When setting an AEC technique, the radiographer must select which of the following?
mA
kVp
activated chambers
Automatic exposure devices provide a diagnostic quality radiograph when the
anatomy of interest is positioned directly above the appropriate ionization chambers.
A radiographer is performing an AP L-Spine radiograph using AEC. The manual technique for this exam would be 40 mAs at 80 kVp. The backup mAs the radiographer should set would be
60 mAs
40/2=20
40+20=60 = 150%