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VTNE Rev Radiology

QuestionAnswer
amount of energy that tissue receives when it is bombarded by ionizing radiation; measured as gray (Gy) or rad absorbed dose
area on the target bombarded by the electrons to produce x rays actual focal spot
term used to describe the flow of electrons as current amperage
a variable signal continuous in both time and amplitude analog
positive electrode in the xray tube that contains the target anode
that which decreases the diagnostic quality of the a radiograph artifact
energy that must be surpassed before an electron can be removed from its orbit binding energy
measuring device to determine patient thickness calipers
negative electrode in the xray tube that supplies the electrons cathode
Directional term indicating that the xray beam enters from toward the tail and exits toward the head caudocranial (CdCr)
charge-coupled device; used in digital radiography and photography to convert visual image into an electric signal CCD
Complimentary metal-oxide semiconductor; digital radiography CMOS
computed radiography; imaging plate is used and run through a computer scanner to read and digitize the image CR
part of film quality indicating clear resolution and definition of the shadows on the radiographic image detail
uses discrete values for data input, processing, transmission, storage, or display rather than a continuous spectrum of values digital, DR (digital radiography)
digital radiography system that converts directly the xrays into an electronic signal DDR, direct digital radiography
farther away from the point of origin; opposite of proximal distal
directional term that refers to limbs distal to and including the carpus. beam enters from the front of the limb and exits at the back of the limb; opposite is PaD dorsopalmer (DPA)
directional term that refers to limbs distal to and including the tarsus dorsoplanter (DPl)
directional term that indicates that the xray beam enters from the back of the animal and exits out its abdomen. lying in ventral recumbency. opposite is VD dorsoventral (DV)
device used to measure the radiation exposure that personnel receive dosimeter
area of the focal spot as seen through the xray tube window and directed on the film effective focal spot
propagation of ionizing energy through space in the form of photons electromagnetic radiation
negatively charged particle of the atom that circles around the nucleus electron
beam of electrons that is accelerated from the cathode to the anode by a high electrical potential in the xray tube electron beam
coiled wire of the cathode that emits the electron beam filament
characteristic of the film that influences radiographic contrast film contrast
loss of detail caused by the size of individual silver halide crystals film graininess
exposure range that will produce acceptable density on the film film latitude
distance from the grid to the xray tube that will minimize grid cutoff focal range
overall grayness that does not contribute to the diagnostic quality of the film fogging
loss of detail due to geometric distortion. also known as penumbra geometric unsharpness
when a grid is not used correctly and the primary beam is absorbed more than normal grid cutoff
ratio of the height of the lead strips as compared to the space between them grid ratio
owing to the angle of the target, a greater intensity of xrays is emitted from the cathode side rather than the anode side heel effect
process of transferring sufficient energy so that the outer electron is removed ionization
maximum energy of the xray beam that determines the quality or penetrating power of the beam kVp
invisible image produced on the xray film after exposure and before processing latent image
maximum amount of radiation exposure that an individual is allowed over a given time period maximum permissible dose MPD
amount of current flowing through the tube times the exposure time in seconds mAs
space between the film and the part being radiographed object-film distance
picture archiving and communication system PACS
loss of detail due to geometric unsharpness penumbra
bundle of radiation energy photon
short for picture element; a single point in a graphic image pixel
xray beam that has a broad spectrum of energies; depends on the kVp; the lower the kVp the more... polychromatic beam
term referring to the average energy of the xray beam or its penetrating ability quality
term that refers to the total number of xray photons quantity
loss of radiographic detail that occurs in faster screens because of the uneven distribution of the phosphor crystals within the screen quantum mottle
object or tissue that absorbs radiation so that the image on the film is lighter radiodense or radiopaque
variation in the degree of darkness between two adjacent areas on the film radiographic contrast
degree of darkness found on the radiograph radiographic density
how well the shadows on the radiograph are clearly identified radiographic quality
use of radiant energy in the dx and tx of disease radiology
quality of a tissue or device that allows most of the xray beams to pass through unaffected radiolucent
process of changing alternating current to current flowing in one direction only (direct current) rectification
primary radiation emitted from the xray tube remnant beam
caused by interaction of the primary beam with tissue or matter in its path scatter radiation
another name for intensifying screens that emit visible or ultraviolet light when exposed to xray scintillating devices
distance from the focal spot to the image receptor or film. formerly called focal film distance source-image distance SID
exposure required to produce a diagnostic film density speed
loss of radiographic detail that occurs because of phosphor variations found in intensifying screens structure mottle
contrast resulting from the difference in density, mass, and atomic number of adjacent tissue structures subject contrast
heating of the filament so that the energy produced forces the electrons to be released from their atomic orbits thermionic emmision
device that personnel wear to indicate dosage of radiation exposure thermoluminescent dosimeter
For your safety when taking radiographs, you should always consider... decreased time, increased distance, increased shielding
Created by: maiken