-Same Lingual Opposite Buccal
-Whether something appears to move lingually and in the same direction or facially (buccally) and appears to move in the opposite direction
-Take 2nd film, move central ray, If object did not move , it is BUCCAL exposure
-Whether something appears to move lingually and in the same direction or facially (buccally) and appears to move in the opposite direction
-Take 2nd film, move central ray, If object did not move , it is BUCCAL exposure
Slob rule *
-Buccal object rule: same as SLOB
-DISTRACTER ANSWER***
-DISTRACTER ANSWER***
Clark’s rule
-Has to do w/ the combined effect of the INTENSITY of the beam and the EXPOSURE TIME.
I d 2/2
— = ——
I d 2/1
-The proportional rule of time/distance is: t-1 d-1
— = —
t-2 d-2
Inverse Square Law
-Exposure DECREASES as distance INCREASES, so if the distance is doubled, the pt’s exposure is REDUCED to 1/4
-Ex: if you go from 16 inches source-film distance and 2 seconds exposure to 8 inches, what is the exposure?
*(1/2 second)*
-Ex: if you go from 16 inches source-film distance and 2 seconds exposure to 8 inches, what is the exposure?
*(1/2 second)*
Relationship of Exposure Time to mA
