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diagnostic systems

QuestionAnswer
what are the layers of the IP in CR *backing *base *anti halo/reflective *phosphor *protective
what is the purpose of the backing *mounted to the back of cassette *prevents handling artifacts *contains barcode *prevents static energy
what is the purpose of the base layer support
what is the purpose of the anti halo/reflective layer *prevents laser light from bouncing back and causing fog or noise *allows reflected light to be emitted to phosphor *anti-halo is blue *reflective is white
what is the purpose of the phosphor layer *acquires latent image *site of f centers
what is the purpose of the protective layer *tubeside *prevents handling artifacts *allows cleaning
what is S:N ratio the ratio of useful informatin vs noise or unuseful information
what is contrast density differences
what is the relationship between S:N ratio and contrast direct
window level controls brightness -direct relationship
window width contrast(gray scale)(visibility of detail) -inverse relationship
what determines the maximum spatial resolution for a given sampling frequency by IRD nyquest frequency
spatial resolution the sharpness of structural edges recorded in the image
exposure latitude range of exposures which produces optimal image with appropriate dose *since range is wider with digital radiography this can lead to dose creep
dynamic range range of exposures that may be captured by a detector
bit depth controls number of shades of gray that can be visualized -formula=2 to the nth(n=number of bits)
equalization software function designed to even the brightness (density). light areas are made darker and dark areas lighter *good for tube placement in chest imaging
edge enhancement *artificial increase in contrast at edge of structures *diamond view is the siemens term *also called high pass filtering(convolution)
smoothing *software function to reduce the appearance of noise but causes loss of fine detail *also call low pass filtering(convolution)
stitching *software that allows RT to place images together if too long for IR *scoliosis pt's *long bone measurement
what types of DR scintilators can we use today *cesium iodide(indirect)(CCD) *godolinium oxysulfide(indirect)(CCD or TFT)
minimum response time length of exposure required to produce an image
variable resistor(mA selector) rheostat
measures electric potential(parallel circuit) voltmeter
measures electric current(series circuit) ammeter
transformer increases or decreases voltage by fixed amount (AC only)
deadman switch shuts off as let as you let off switch
anything that a radiographer will be touching is on the _____________ side of the circuit primary(low voltage)
select mAs, unit starts at highest mA and shortest time. mA drops off during exposure with appropriate time changes. Used to get shortes time for mAs falling load
kVp selector autotransformer
conversion of AC to DC to apply to tube rectification
where are rectifiers found between secondary coil of step up transformer and tube so that current will flow in one direction from filament to anode
Created by: bigad1982