 | Term | Definition |
| |
Trendelenburg position |
A tilting table allowing a patient's head to be lowered at least 15° |
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Detent |
A mechanism that tends to stop a moving part in a specific location |
| |
Computed radiography (CR) |
Sometimes called "filmless systems" which produce images via a digital format using computer technology, eliminating the need for darkrooms |
| |
Image receptor (IR) system |
Consists of the X-ray film and the film holder, also known as a cassette |
| |
24 x 30 cm |
A common IR size used for general examinations and Mammography |
| |
35 x 43 cm |
A common IR size used for general examinations |
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Central ray |
A line in the center of the X-ray beam and perpendicular to the long axis of the X-ray tube |
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Attenuation |
The absorption of the X-ray beam by matter |
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Control booth |
The portion of the X-ray room that is protected from scatter radiation and safe during exposures |
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Latent image |
A film that has been exposed but has not yet been processed and has a patter of exposure |
| |
24 x 24 cm |
A typical IR size used for Fluoroscopic spots |
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Collimater |
A box-like device attached under the tube housing that allows the limited operator to vary the size of the radiation field |
| |
Grid or Bucky |
A device to protect the film from being fogged by scatter radiation |
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Remnant (Exit) Radiation |
A pattern of varying intensity in the X-ray beam that exits on the opposite side of the patient; creates the image on the film |
| |
Tube port |
An opening in the X-ray tube where X-rays that are traveling in a useful direction exit |
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Scatter Radiation |
Attenuated X-rays can either be absorbed within the body or scattered outside the body; generally has less energy than the primary beam |
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Scatter Radiation fog |
The unwanted image exposure caused by scatter radiation |
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Primary Radiation |
The X-ray beam that leaves the tube and is unattenuated, except by air |
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Longitudinal |
Tube motion along the long axis of the table |
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Transverse |
Tube motion across the table, at right angles to longitudinal |
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Vertical |
Tube motion up and down, increasing or decreasing the distance between the tube and the table |
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Angle (tilt, roll) |
Permits angulation of the tube along the longitudinal axis of the table |
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Rotation |
Allows the entire tube stand to turn on its axis |
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X-Ray tube |
The source of X-rays |
| |
Phosphor material |
Used in a closed cassette rather than on film to obtain computed radiography (CR) images |
