Term
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Definition
| Photostimulable storage phosphor |
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Term
cassette
imaging plate
cr reader
optical components
computer control |
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Definition
| components of a cr system |
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Term
| cassette backing in CR is made of |
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Definition
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Term
barium
fluorohalide
bromides and iodides
europium activators |
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Definition
| most common active phosphors |
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Term
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Definition
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Term
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Definition
| Photostimulable Imaging Plates |
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Term
| the drive mechanism moves the IP constantly, yet slowly, along the long axis of the IP |
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Definition
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Term
| a device deflects the laser beam back and forth across the IP |
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Definition
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Term
| source of stimulating light |
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Definition
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Term
| width/ wavelength of the laser beam |
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Definition
| 100 micrometers wide and 633 nanometers long |
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Term
| keeps the laser beam constant size, shape, speed and intensity |
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Definition
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Term
| emitted light is channeled inot a funnel like fiber optic collection assembly and is directed at the photomultiplier tube or CCD |
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Definition
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Term
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Definition
| turns light into electrons for computer to read |
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Term
filters the light before photodetection occurs
filters out nonblue light |
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Definition
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Term
| receives light from the fiber optic collections assembly and transmits a time varying analog signal to a computer system |
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Definition
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Term
| the output of the phototdector is a ____ analog signal that is transmitted to a computer system that will shape the signal before final image is formed |
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Definition
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Term
| the place where a completed image can be stored temporarily until it is transferred to a workstation |
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Definition
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Term
| number of layers in the imaging plate in the CR |
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Definition
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Term
| a very thin, tough clear plastic that protects the phosphor layer |
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Definition
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Term
| holds the PSP (the active component in the plate) |
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Definition
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Term
sends light in a forward direction when released in the cassette reader
helps to increase detail |
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Definition
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Term
| absorbs and reduces static electricity |
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Definition
| conductive/ conductor layer |
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Term
absorbs the stimulating light but reflects emitted light
assists reflective layer |
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Definition
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Term
| prevents light from erasing data on the IP or leaking though the backing, which would decrease spatial resolution |
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Definition
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Term
| a soft polymer that protects the back of the cassette |
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Definition
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Term
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Definition
| photostimulable luminescence |
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Term
| light produced by a phosphor when struck by light or xray photons |
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Definition
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Term
| approximately ___% of electrons return to their ground state immediately after xray beam exposes PSP |
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Definition
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Term
| xray beam exposes a PSP, the energy transfer results in exictation of electrons into a mestastable state |
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Definition
| first step in producing a PSL signal |
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Term
a finely focused beam of infrared light with wavelength and beam diameter of 50-100 nm is directed at PSP
smaller laser gives better detail |
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Definition
| second step in sequence of producing a PSL signal |
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Term
to detect and read the stimulated emission
latent image is made visible |
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Definition
| third step in producing a PSL signal |
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Term
| erase the plate signal production by flooding plate with white light |
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Definition
| final step in producing a PSL signal |
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Term
involves a finely focused laser beam that frees trapped electrons, allowing them to return to a lower energy state
light is then collected by the optical system, directed to the PM, which converts it to electronic signal, the ADC converts it to a digital signal so computer can work with image |
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Definition
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Term
| an assigned numerical value to a light photon received from the CR reader PM |
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Definition
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Term
| released electrons enter a digitizer that divides the analog image into the matrix and assigns each square a number based on _____ |
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Definition
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Term
| typical number of pixels in a matrix for CT |
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Definition
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Term
| number of pixels for a radiography matrix |
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Definition
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Term
| imaging plates are extremely sensitive to |
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Definition
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Term
| imaging plates are automatically erased by flooding it with ___ |
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Definition
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Term
| preprocessing in digital is largely ____ |
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Definition
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Term
| post processing requires _____ |
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Definition
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Term
annotation
window and level
magnification
image flip and image inversion
subtraction
pixel shift
region of interest |
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Definition
| post processing functions |
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Term
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Definition
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Term
expands the digital grayscale to visible
changes contrast and density |
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Definition
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Term
| improves visualization and spatial resolution |
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Definition
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Term
| reorients image presentation and makes white black and black white |
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Definition
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Term
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Definition
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Term
| registering the image to correct for patient motion |
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Definition
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Term
| determines average pixel value in quantitative imaging |
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Definition
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Term
| exposure sensitivity of the OP ranges from ____ up to maximum of ____ |
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Definition
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Term
| allows us to see both tissue and bone with one exposure |
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Definition
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Term
related to the amount of amplification required by the PM tube to adjust the digital image
used by fuji |
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Definition
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Term
CR indicator system that is directly proportional to the radiation striking the IP
used by Kodak |
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Definition
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Term
uses a log median exposure
increase of .3 means dose was double |
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Definition
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Term
| wince CR plates have a wide dynamic range, they are very sensitive to ___ from both scatter and background radiation |
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Definition
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