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RAD CH7
Definitions, abbreviations
| Question | Answer |
|---|---|
| Anode | positive electrode in the x-ray tube |
| Automatic collimation | positive beam limitation, the ability go the radiographic equipment to collimate automatically the x-ray beam to the same side as the IR resting in the buck tray- prevent unnecessary exposure |
| Bucky | short for potter-bucky diaphragm, moving grid used to remove scatter radiation from the remnant beam, which can cause fog on the IR |
| Cassette | light proof container holding the IR, either an image plate for CR or x-ray film and intensifying screens |
| Cathode | negative electrodes in the x-ray tube |
| Collimator | boxlike structure attached to the x-ray tube containing lead shutters that limit the x-ray beam to a specific area of the body |
| Computed Radiography (CR) | digital radiographic imaging using a cassette containing an image plate |
| DICOM | Digital imaging and communications in medicine, a standart protocol used for blending a picture archiving and communications system and various imaging modalities |
| Direct Digital Radiography (DR) | misrepresentation of the size or shape of the object recorded |
| Focal Spot | area if the anode in the x-ray tube from which x-rays emanate |
| Grid | device that is placed between the patient and the IR that absorbs scatter radiation that is exiting the body |
| HIS | Hospital information system |
| Image Receptor (IR) | any device that captures the remnant beam |
| Imaging plate (IP) | made up of a photostimulable phosphor that absorbs the photon energies exiting the patient, located inside a CR cassette |
| Intensifying Screen | mounted in the cassette singly or in pairs, screens glow with visible light when struck by radiation and expose the film contained in the cassette |
| kVp | peak kilovoltage that is applied to the x-ray tube, which determines the wavelength of the x-ray beam, its ability to penetrate the body, and the overall contrast of the image |
| mAs | milliampere seconds, the product of milliamperage and time, is the current that is passed through the x-ray tube, which is then converted to x-rays when it strikes the anode; it determines the number of x-rays produced and darkness |
| Matrix | digital image that is made up of raws and columns of data |
| PACS | picture archiving and communication system |
| Pixel | picture element, the smallest component of a matrix |
| Processor | machine that automatically develops x-ray film |
| Radiograph | x-ray image as viewed after it has been exposed and processed |
| Radiographic position | specific position of the body or part in relation to the table or IR |
| Radiographic projection | path that the x-ray beam takes as it passes through the body; anatomic position |
| Radiographic view | term used to explain how the IR sees the body image; opposite of radiographic projection |
| Remnant Beam | x-ray beam that exits the patient; made up of image forming rays and scatter radiation |
| RIS | radiology information system |
| Voxel | volume element; section of tissue represented by a pixel |
Created by:
juaire30
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