Chapter Two Flashcards
true or false; density is not affected by distance
false
the greater the distance, the _____ density
lower
what is the formula for the affect of distance on density
inverse square law
D1/D2= (d2)2 / (d1)2
if you increase you kv, the beam would have more _____
penetrating power
what is the 15% rule
increase kVp by 15% is the equivalent of doubling your mAs to have an increase in image density
scenario: you have a technique say 80 @ 20 for an exam and you like your image’s density but for the patient it would be best to reduce their dose as much as possible. what could you do to maintain the density but lower the dose? state the new technique
you could increase the kVp by 15% and reduce the mAs by 50%
new technique: 92 @ 10
true or false; a practical amount of mass can make up for an insufficient kV
False
overexposure causes high or low density? high amount of blackness or whiteness on the film?
high density
high blackness
underexposure causes high or low density? high amount of blackness or whiteness on the film?
low density
high whiteness
mAs and distance are ______ proportional
directly
what has the lowest tissue density: cartilage or fat
fat
what has the highest tissue density: solid organs or muscle
solid organs
for tissues with low density would you use high or low kvp
low
name some of the patient factors that increase density
physique, gender, age, body type, pathology
what are the two kinds of filters and describe them
inherent- no control and increase the average penetrability of the beam
added - compensating (require increase in kVp)
