Image Acquisition Flashcards
the ____ is selected according to the number of photons needed for a particular part
mAs
it is when insufficient light is produced that results of the grainy image
quantum mottle/quantum noise
AEC
automatic exposure control
it will influence the amount of mAs necessary to create the image
backscatter radiation
it must be chosen for penetration and the type and amount of contrast desired
kilovoltage peak (kVp)
kVp values from range around ___ to ____
45 to 120
it absorbs the scatter that exits the patient and affects latent image formation
grid
it is the reduction of the area of beam that reaches the patient through the use of two pairs of lead shutters encased in a housing attached to the xray tube
collimation
it results in increased contrast as a result of the reduction of scatter as fog and reduces the amount of grid cleanup necessary for increased resolution
collimation
it is the post exposure image manipulation
shuttering
______ ________ are displayed in tiny rows of picture elements or pixels
digital images
it is the pattern that occurs because the grid lines and the scanning laser are parallel
moire
moving grid also called ____
Bucky
grid selection factors are:
frequency
ratio
focus
size
it is the relationship between the height of the lead strips and the space between the lead strips
grid ratio