DIGITAL RADIOGRAPHY HIGH YIELD Flashcards
digital imaging is based on what properties?
matrix
planar x-ray imaging
how to increase sharper image and resolution via pixels?
increase the matrix greater number of pixels
increase number of pixels, decrease pixel size
this property of digital imaging is image formation based on differential attenuation of the x-ray beam by body tissues that differ in thickness, density, or chemical make-up?
planar x-ray imaging
advantages of digital radiography vs film?
separation bwt image acquisition and image processing and display to reduce noise
easier to communicate, store
not limited by a range of exposures
windowing
cheaper
saves space
safer
disadvantages of digital radiography?
less resolution than film
overexposure might by missed
high initial costs
***image degrades 25% in 8 hours
CR has greater sensitivity to scatter
types of digital imaging?
this type used photostimulable storage phosphor?
direct radiography
computed radiography
computed radiography
properties of computed radiography?
similar to screen film, uses *scintillator plates
light isn’t immediately released, traps high energy electrons
CR plate/cassette
computed radiography has what kind of phosphors?
photostimulable phosphors made of barium fluorohalide+Eu activators and processed with IR lasers
the structure of the CR plate, a property of computed radiography has a layer that contains PSPs, which one is this?
what are the layers?
phosphor layer
protective layer phosphor layer conductor layer support layer light shield layer backing layer
F centers and K edge is found in what property of the CR?
what does the K edge attenuate at?
the CR plate/cassette
35-50 KeV- below the rare earth elements
what are the steps of the CR?
x-rays exit patient and react w/ PSPs
produces europium electron holes
latent image is scanned w/ infrared laser beam
light emitted by latent image Eu holes viewed by phosphomultiplyer (PMP)
