Brightness and Contrast Flashcards
an object less effective in absorbing/blocking x-ray radiation
radiolucent
in radiolucency, more x-rays reach ____ and object looks ____
receptor, dark/black
in radiopacity, less x-rays reach receptor and object looks ____
light/white
term that refers to the degree of white (vs dark) of an object on a digital image/radiograph
brightness
radiopacity/radiolucency are _____ terms
relative
observed differences in adjoining radiographic densities
radiographic contrast
contrast is caused by ____ _____ of x-ray beam
differential absorption
great contrast is ______
“black and white”
low contrast is more _____
“gray”
contrast is influenced by…
chemical composition thickness density noise beam energy/penetrability exposure time/mA
chemical composition opacity rank (highest to lowest)
metal
enamel
dentin/bone
soft tissue
the higher the density of material, the more _____
radiopaque
material density opacity rank (highest to lowest)
metal enamel cortical bone/dentin trabecular bone soft tissue
the thicker the object, the more _____; the longer the path an x-ray beam travels through a material, the more ______
radiopaque, radiopaque (egg example)
incorporation of image information from scattered photon results in statistically random sign intensity
noise
