Receptor Exposure - Radiation Protection Flashcards
what is receptor exposure?
the quantity of x-rays that reach the IR
when mAs is doubled, what happens to receptor exposure?
receptor exposure is doubled
when kVp is increased by 15%, what happens to receptor exposure?
receptor exposure is doubled
if you increase grid ratio, what happens to receptor exposure?
why?
receptor exposure is decreased
grids absorb scatter
if you increase body habitus, what happens to receptor exposure?
why?
receptor exposure is decreased
more attenuation & absorption
if you increase beam restriction, what happens to receptor exposure?
why?
receptor exposure is decreased
reduction of scatter produced
if you increase SID, what happens to receptor exposure?
why?
receptor exposure decreases
affected by the inverse square law
if you increase kVp, what happen to receptor exposure?
why?
receptor exposure increases
more penetrating power
if you increase mAs, what happens to receptor exposure?
why?
receptor exposure increases
more x-rays produced
what is ALARA?
As Low As Reasonably Acheivable
if you increase beam filtration, what happens to patient dose?
why?
patient dose decreases
removes long-wavelength rays
total filtration must be at least ____ aluminum equivalent
2.5mm
if you increase beam restriction, what happens to patient dose?
patient dose decreases
if you increase body habitus, what happens to patient dose?
why?
patient dose increases
due to increasing mAs
a recpetor with a high DQE will do what to patient dose?
lower patient dose
if you increase screen speed, what happend to patient dose?
decreases
if you increase grid ratio, what happens to patient dose?
why?
patient dose increases
grids remove scatter radiation to increase contrast, but an increase in mAs is needed
if you increase kVp, what happens to patient dose?
why?
patient dose decreases
higher penetration power
if you increase mAs, what happens to patient dose?
why?
patient dose increases
higher quantity of x-rays
if you increase SID, what happens to patient dose?
patient dose decreases
if you increase SID without adjusting mAs, what happens to patient dose?
patient dose decreases
what are the 3 ways to lower a radiographers dose?
time
distance
shielding
what are 6 ways to lower patient dose?
time(fluoro) distance(OID) shielding collimation increase kVp, decrease mAs filtration
