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PACS Chapter 2

Key terms

TermDefinition
Air kerma Measurement of Radiation Energy absorbed in a unit of air.
Brightness level of intensity of a digital image on a display monitor
Contrast resolution Ability of a digital system to display changes in grayscale value
Detective quantum efficiency (DQE) Measurement of how efficiently a system converts an X-ray input signal into a useful output image
Deviation Index (DI) The difference between actual exposure and target exposure expressed as a logarithm
Dynamic range The ability of an imaging system to respond to varying levels of exposure
Field of view (FOV) Area of the image receptor from where the image data are collected.
Indicated equivalent air kerma (Kind) Measurement of radiation incident on the image receptor derived from pixel values produced by the exposure to an image receptor
Latitude Amount of error that can be made in exposure factor choice and still result in the capture of a quality image
Matrix Rectangular or square table of numbers that represent the pixel intensity to be displayed on the monitor
Modulation transfer function (MTF) Ability of a system to record available spatial frequencies
Noise Any type of signal interference in a digital image
Noise power spectrum (NPS) Spatial frequency content and spatial characteristics of noise
Pixel Basic picture element on a display
Pixel bit depth Determines the maximum range of pixel values the computer can store. The value signify the gray scale that is available to create the digital image
Signal-to-noise ratio (SNR) The ratio of the amount of total signal versus the amount of noise present in any digital image
Spatial resolution Amount of detail or sharpness in a digital image
Standardized radiation exposure (Kstd) Standard exposure typical of an imaging receptor system that is made with additional filtration to stimulate patient tissue
Target equivalent air kerma value (Ktgt) A set of established values that represent optimal exposures for each specific body part and view
Created by: 2304598396295915
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