The X-ray tube
The most frequently used support mechanism is
Ceiling Support System
kVp controls
x-ray beam energy
what are patient factors
anatomical thickness and body composition
image perception is the visual _____ required for proper image interpretation
sensitivity
disadvantage of magnification
inceases patient radiation dose
primary parts of cathode
filament and focusin cup
x-ray energy remains fixed a change in?
ma
radiograhic technique charts embedded in the operationg console are based on_____ patients
sthenic
illumination is
image brightness
what is the controlling factor for x-ray intensity
mAs
what is the rotating anode powered by
an electromagnetic induction motor
Changing the focal spot for a given kVP/mAs setting (does or does not) change the x-ray intensity or energy?
does not
what subjuct contrast does the abdomen have?
low
when light arrives at the retina, it is detected by
rods and cones
when the current is sufficently high, the outer shell of the filament atoms are boiled off and ejected from the filament
thermionic emission
the actual X-ray source
the focal spot
magnification factor
sid/sod
true or false: an increase of 5% in kVp may be accompanied by a 30% increase in mAs to produce the same IR response
false
the view registered without an eye or head movement
foveal vision
what does contrast sensitivity detect
differences in brightness level
most frequent cause of abrupt tube failure
electron arcing from the filament
what controlling image quality factor controls distortion
patient positioning
distortion is caused by
misrepresentation of object size and shape in the image
_____ object contrast is required for image perception under low luminance
higher
distortion is reduced by
positioning the part parallel to the IR and the CR perpendicular to both