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Radiology 150
| Term | Definition |
|---|---|
| ALARA | As low as reasonably achievable |
| Anechonic | tissue that transmits all sound through to deeper tissues |
| Annular array | arranges the crystals in concentric rings |
| Anode | A positively charged electrode in the x ray tube consisting of a tungsten target the produces x rays when hit with electrons from the cathode |
| Bucky | Puts the grid in motion as the xrays are generated |
| Cathode | a negatively charged electrode that produces electrons in the xray tube |
| Collimators | a device on an xray machine used to restrict the xray beam to reduce scatter |
| Contrast | the difference in radiographic density between adjacent areas on a radiographic image |
| Direct exposure film | more sensitive to direct xrays then it is to light |
| Distance enhancment | occurs when the sound beam traverses a cystic structure |
| Echoic | the most of the sound transmitted back to the transducer |
| Film Latitude | the ability of an emulsion to record a wide range of densities. |
| Film Focal Distance (FFD) | Measured from the target of the xray tube to the radiographic film or plate |
| Fluoroscopy | imaging technique that uses an xray tube and image intensifer to produce a continual steam of images |
| Focused grids | lead strips placed progressively increasing angles match the divergence of the xray beam |
| Heel effect | Visible difference in the density produced in a radiograph |
| Hyperechoic | describes tissues that reflect more sound back to the transducer than surrounding tissues. appears darker |
| Hypoechoic | describes tissues the reflect less sound back to the transducer then surrounding tissues, appears lighter |
| Intensifying screens | Plates in the xray cassette composed of phosphorescent crystal that function to emit light |
| Isoechoic | describes tissues that appears to have the same echotexture on the screen as surrounding tissues |
| Kilovoltage peak (kVp) | the maximum voltage applied across an xray tube that determines the energy of the electrons produced |
| Latent Image | the invisible image in the emulsion of an xray film produced by after the image has been exposed to light |
| Maximum permissible dose (MPD) | the highest amount of radiation one person can have |
| Milliamperage (mA) | exposure time in seconds |
| Mirror Image | artifact creates the illusion of something that isnt there. |
| Object-film distance (OFD) | The distance between the object being radiographed and the film or plate |
| Penumbra Effect | the partial or imperfect shadow of an object outside the complete shadow, where the light from the source is partially cut off |
| Radiographic density | the degree of darkness on a radiograph |
| Radiolucent | transparent to X-rays |
| Radiopaque | opaque to X-rays or similar radiation. |
| Rem | stands for roentgen equivalent in man |
| Sievert (SV) | The dose of radiation equivalent to the dose absorbed by tissue; 1 sv equals 100rems |
Created by:
Cheyennez
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