Acronyms
PACS
Picture Archival Communication System
Graphical representation of the image
Histogram
Controls birghtness
Window Level
The ability of imaging system to demonstrate small details of an object
Spatial resolution
Made of a soft polymer that protects the cassette
Backing layer
DICOM
Digital Imaging Communications in Medicine
Applies the standard contrast for the image
LUT
makes light areas dark and dark areas light
Inversion
Measures the number of pixels within a unit area
Pixel Density
When the laser scans in the same direction as grid lines
Moire Effects
SNR
Signal to noise ratio
When a sigle set of data is matched this is considered
Priori
small segment of the image is enlarged
magnifying glass
Air Kerma
Material that converts x-rays to electrical signal
Amorphous Selenium
Detector Quantum Efficiency
States that at least twice the numbers of pixels needed to create the image must be sampled
Nyquist Theorem
over sensitization of chemical rhodapsin in eye
Veil glare
Ability of IR to respond to varying levels of exposure
Dynamic Range
Found in indirect DR plates, replaces CCDs and helps to eliminate noise, because less light spread occurs.
CMOS
MTF
Modulation Transfer Function
Preprocessing technique that reduces noise and improves contrast
Flat Fielding
Removes noise and reduces contrast
Smoothing
Measures the percentage of x-rays that are absorbed when they hit the detector AND contribute to the image
DQE
Material(S) that convert x-rays to light
Cesium Iodide and Gadolinium Oxysulfide