quiz! Flashcards
what doubles exposure and density?
mA
where do the electrons come from?
tungsten filament (cathode)
when do you not wear gloves?
transferring and getting cotton out of drawer
how do you get rid of low energy rays?
aluminum
what is most of the xray transferred as?
heat
high contrast is?
low kvp
if you go from 16 to 8, how much less exposure do you need?
4 less exposure
if proper sterilization precautions are not taken, cross contamination can occur when ?
all the above
down-step transformer
from electron cloud around cathode
lateral
PSP
highest spatial resolution
film
similar contrast to each other
film and digitial CCD
what results in a low contrast radiograph?
comptom scattering
which has the lowest contast?
PSP
what does NOT help with a pt with a strong gag reflex?
start with posterior periapical
what does it mean if there is a radioluecent circle in the bottom left of x-ray?
PSP was backward
what will give you the best radiograph?
long beam, small focal point, paralleling technique
which one is an example of indirect digital?
PSP
if you don’t follow safety guidelines, could it prevent you from getting your license?
yes
what do the cardboard cover and plastic around the PSP do?
prevents light and contamination
the only one that does quality?
kVp
what is FALSE about why tungsten is preferred?
small mass number
what’s true about x-rays?
electromagnetic radiation, diverge in straight lines
which has the highest absorption?
amalgam
what does not affect penetrability?
time
latent image
visible image after chemical processing
what should your computer be set to?
32 bits
rinn instruments
semicritical and must be heat sterilized
what helps with teeth overlap?
image receptor parallel to lingual surfaces of teeth
bit depth correlates with ?
computer contrast
an 8 bit will have ____ than 12 bit
less contrast
picture with beam in downward position?
positive BID
for maxillary teeth, how do you position the bite block?
outside bite block
for mandibular teeth, how do you position the bite block?
toward the middle
what to do when torus is present?
place receptor on far side of torus
if you want to increase density?
increase mA
decrease kvp
PA has to have?
2 mm showing apical to apex of root
what does it mean if you can see mandible?
excessive vertical
