radiology Flashcards
5 densities
metal,bone,soft tissue,fat,air
most radiopaque (white)
metal
most radiolucent (black)
air
kVp
kilovoltage peak
increased kVp= faster elecrons more penetrating power
target made of
tungsten
base of target made of what
copper
mA
controls electricity needed that heat the filament
intensifying screen functions
constructed of phosphorus bound crystals
crystals convert x rays to fluorescent light
target
inside xray tube -anode
made of tungesten base made of copper
filament
inside xray tube “focusing cup”
cathode
cathode
source of electrons in xray tube
anode
target site
rotors
i
tungsten
target ;high melting point
copper
base of target great conductor of heat
source image distance and its affects on an image
as a distance increases intensity of beam (radiation) decreases image details increase
standard SID
40 (100cm) (FID)
inverse square law
the intensity of the xray beam is inversely proprtional to the square of the distance from the source
where is heel effect created and how do we utilize it
Appropriate use of the “anode heel effect” of the output beam from an X-ray tube can reduce the effective dose to patients in some common radiological examinations.
foreshortening
object not parallel to cassette
shorter than actual size
magnification
object parallel but away from casette & towards tube
larger than actual size and edges become blurred
elongation
cassette not parallel to object
object becomes longer and one edge is blurred
