Receptor exposure

exposure factor can also be called as

technical factors or radiographic techniques

receptor exposure is define as

the amount of radiation that REACHES the IR AFTER passing through the patient

X-Ray techs must obtain images w/ the highest ___ while exposing the patient to the ___ radiation dose

quality ; lowest

3 main factors that affect radiographic image quality

receptor exposure ; spatial resolution ; distortion

mAs is made of

mA ; exposure time ( s )

mA controls the ____ or ____ of x-rays photon in the x-ray beam

quantity ; numbers

s ( exposure time ) controls the

time the x-ray is on

mAs controls the quantity of x-ray being ____ from the x-ray tube

produced

when mAs is double or produce more

more raditation reaches the image receptor

when theres less mAs reaching the IR then it results in _____ image

underexposed

this image shows use that

More mAs ; more exposure

what does kVp stand for

Kilovoltage peak

kVp controls the ___ or ____ ( penetrating power ) of the x-ray beam

quality ; energy

higher kVp causes ___ x-ray ____ to reach the IR

more ; energy

higher penetration means

the photons pass through the THICKER body parts w/out getting blocked

true or false: a 15% change in kVp is equal to doubling or halving the mAs

true

the 15% rule states

if kVp is increased by 15% than mAs would be halved

this image shows

kVp increased so mAs got cut in half

this images shows

kVp decreased so mAs is doubled

what does SID stand for

source to image receptor distance

SID means

the length from the x-ray tube focal spot and the IR

the expsoure intensity is controlled by the

inverse square law

the inverse square law states if disance ( SID ) is doubled it

reduces the x-ray beam intensity by a factor of 4

the inverse square law states if disance ( SID ) is cut in half then it

increases the x-ray beam intensity by a factor of 4

what is a grid

a device w/ lead strips used to absorb scatter radiation

whats the purpose of a grid

to reduce the amount of scatter radiation

is scatter radiation a useful exposure

no, it degrades the image quality

where is the grid placed

bewteen the patient and the Image receptor

when using the grid, how thick must the body part be

4” or 10 cm

when using a grid, whats important ?

proper central alignment w/ the grid

why is it important to have proper central ray alignment with the grid

to avoid the grid lines on absoring the primary x-ray beam

physical grids ______ image quality but _____ patient radiation exposure

improve ; increase

what technical factor is increased

mAs

a virtual grid is

a scatter correction software

the virtual grid enchances image _____ and ______

contrast ; clarity

when using a grid on a thicker body part, the thicker part creates more _______

scatter radiation

what is the most commonly used form of beam restriction

collimation

what happens when you increase the collimation ( make the field of view smaller ) leads

less radiation dose to pt ; reduces x - ray scatter

in order to manipulate the size of the x-ray beam, what should be adjusted

lead shutters

when collimation is closely restricted to the part being examined, it ensures

optimal image quality

what is the name of a numeric value that is representative to the image receptor ( IR )

exposure indicator ( EI )

how many critical concept does the relationship between the EI and the radiation exposure to the IR have

3