Producing the image Flashcards
the quality of an xray beam is determined by the
penetrating power
number of xrays traveling from the xray tube to the film
mA
responsible for accelerating the electrons from the cathode to the anode
kilovoltage
kilovoltage relates to what of the xrays
penetrating power
what radiographic setting determines the quality of the xray beam and its ability to penetrate tissue
kvp
if the kvp is high, the mA is
low
sante’s rule formula?
(2x the thickness in cm) + 40 = kvp
what is the measure of the electron current to the filament which determines how many xrays are produced?
mA
hows the mAs calculated?
mA x time = mAs
period of time the xrays are permitted to leave the tube
exposure time
decrease mA = ___ electrons
less
SID
source image distance
FD
focal film distance
FFD is always kept at what distance
40 inches
measurable distance between two adjacent densities
contrast
varying degrees of blackness
density
xrays turn the radiograph what color
black
non-image forming radiation that is scattered in all directions bc of objects in the path of the primary beam
scatter radiation
what is the primary exposure factor that controls scatter radiation?
kvp
anatomical areas viewed using short/long scale
short- bone and air
long- soft tissue
what exposure factor affects density/contrast
density- mA
contrast- kvp
(contrast) which is most/least dense
most - bone/metal
least- air/gas
high contrast = which scale?
short
low contrast- which scale?
long
a radiograph with an increased number of grey tones exhibits ___ scale of contrast
long
a radiograph that is mainly black and whites (few shades of gray) exhibits ___ scale of contrast
short
animal measures 1-10 cm, use
table top
animal measures 11-29 cm, use
grid/ film tray
