Radiographic Ima
process by which a beam of radiation is reduced in energy when passing through tissue or other materials
Attenuation
ability to distinguish between very subtle differences in image receptors exposures and differentiate them from the noise in the image
Contrast Resolution
device that converts incident xray energy directly into an electronic signal. typically using a photoconductor as the xray absorber and a thin film transistor as the signal collection area, which then sends electronic signal to the computer for processing and viewing.
direct conversion flat-panel detector.
undesirable exposure to the image receptor
Fog
amount of ionizing radiation received by the image receptor
image receptor (IR) exposure.
Relative brightness differences between the adjacent pixels in a digital image as viewed on a monitor
displayed image contrast
number of shades of gray that can be stored per detector element and displayed per pixel: ranges from 8 bits to 32 bits.
Grayscale bit depth
device that coverts xray energy into light
the light is then detected by a charge coupled device or photodiodes that are coupled with thin-film transistors, and converted into an electronic signal that is sent to the computer for processing and viewing
Indirect conversion flat-panel detector
function of a display monitor, changes images lightness/darkness
brightness
pixel-sized element of the digital radiography image receptor that has a fized dimension in x- and y- orientation
Detector element.
Misrepresentation of the true size or shape of an object
distortion
device consisting of thin lead strips designed to permit primary radiation to pass while absorbing scatter radiation.
Grid.
Mathematic formula that describes the relationship between radiation intensity and distance from the course of the radiation
Inverse Square Law.
digital image acquisition modality that uses storage phosphor plates to produce images.
Computed Radiography (CR)
numeric representation of the quantity of exposure received by a digital image receptor
exposure indicator
Amount of filtration necessary to reduce the intensity of the radiation beam to one-half its original value
Half-layer value.
measure of the potential difference which controls the quality and affects the quantity of xray photons produced in the xray tube.
Kilovoltage Peak (kVp)
the difference between the ranges of adjacent IR exposures represented as gray tones in an image.
Contrast
digital image acquisition systems that convert x-ray energy into a digital electronic signal for manipulation and display using direct or indirect conversion
Digital Radiography (DR)
Range of exposures that produce a diagnostic quality image
exposure latitude
Device used to capture the image for recording, such as photo stimulable phosphor imaging plate or digital flat-panel detector
Image receptor (IR)
invisible image created after exposure but before processing.
latent image