film Flashcards
base layer of film
-provides _______
-____ tint
-________
-_________ thick
-rigid structure
-blue
-polyester material
-150-300um
emulsion layer in film
-______ and ____________
-___ thick
-__________
-gelatin, silver halide crystals
-3-5um
-tabular
intensifying screens of film
-__ layers
-(increases/lowers) patient dose
-luminescence/fluorescence
-screen speed
4 layers, lowers
as the number and/or size of silver halide crystals increase, film sensitivity or speed ____________
increases
function of the intensifying screen
turn x-rays into light
the emission of light from the intensifying screen when stimulated by radiation
luminescence
refers to the ability of phosphors to emit visible light only while exposed to x-rays (with little or no afterglow)
fluorescence
4 layers of the intensifying screens
protective coating (closest to film)
phosphor layer (aka active layer, most important part)
reflecting/absorbing layer
base
active phosphor layer are composed of ________; these range in atomic number from _____ on the periodic table
rare earth elements, 57-71
as screen speed increases, (more/less) light is emitted with (more/less) patient exposure
more, less exposure to patient
as screen speed increases, recorded detail ___________
decreases
thicker phosphor layer = (faster/slower) screen speed
faster screen speed
thicker phosphor layer will ______ screen speed, ____ recorded detail, and _____ patient dose
increase, decrease, decrease
larger phosphor crystal size will ______ screen speed, ____ recorded detail, and _____ patient dose
increase, decrease, decrease
reflective layer will ______ screen speed, ____ recorded detail, and _____ patient dose
increase, decrease, decrease
