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VTNE Rev Radiology
| Question | Answer |
|---|---|
| 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 |
| 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 |
| 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/unsharpness | penumbra |
| 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 |
| bundle of radiation energy | photon |
| 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 due to 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 |
| caused by interaction of the primary beam with tissue or matter in its path | scatter radiation |
| 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 |
| contrast resulting from the difference in density, mass, and atomic number of adjacent tissue structures | subject contrast |
| 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
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