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55 Cards in this Set
- Front
- Back
bucky |
a moving grid that limits the amount of scattered radiation reaching a radiographic film, thereby increasing the image contrast |
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cassette |
a device used in radiography for holding a sheet of x-ray film and a set of intensifying screens |
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collimator |
a device for limiting the size and shape of a radiation beam |
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detent |
is a special mechanism that tends to stop a moving part in a specific location |
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dosimeter |
an instrument to detect and measure accumulated radiation exposure |
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erthyema |
"radiation burn", or inflammation of the skin or mucous membranes caused by the dilation of congestion of superficial capillaries |
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fluoroscope |
a device used for the immediate projection of a radiographic image on a fluorescent screen for visual examination |
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grid |
a device used during a radiographic examination to absorb radiation that is not heading along a straight line from the x-ray source to the film |
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image intensifier |
an electronic device used to produce a fluoroscopic image with a low-radiation exposure |
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kilovoltage peak (kVp) |
potential difference measured at the peak of the electrical cycle |
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latent image |
it is the image of the patient is contained in the emulsion of the radiographic film |
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milliamperage (mA) |
a unit of electric current that is one thousandth of an ampere |
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Milliampere-seconds (mAs) |
the product obtained by multiplying the electric current in milliamperes by the exposure time in seconds |
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source-image-distance (SID) |
the distance between the x-ray tube target and the image receptor, measured along the CR |
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Wilhelm Conrad Roentgen |
discovered the x-rays in 1895 |
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early radiation injuries |
skin burns, hair loss, anemia |
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focal spot |
small area on the target |
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primary x-ray beam |
from the focal spot, x-rays diverge into space |
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radiation field |
cross section of the x-ray beam at the point where it is utilized |
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central ray |
photon in the center of primary beam and perpendicular to the long axis of the x-ray tube |
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collimator |
x-ray beam size is restricted by the size of the port, controls the field size |
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primary radiation |
the x-ray beam that leaves the tube and is not attenuated, except by air |
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scatter radiation |
radiation is scattered or created as a result of the attenuation of the primary x-ray beam |
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remnant radiation |
what remains of the primary beam after it has been attenuated by matter |
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x-ray tube housing |
protective covering around the x-ray tube -protects and supports components -shields from off-focus radiation |
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x-ray tube support |
provides support and mobility for the tube ex: ceiling mount & floor stand |
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tube motions |
longitudinal, transverse, vertical, rotation, roll |
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longitudinal |
along the long axis of the table |
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transverse |
across the table at rifht angles to longitudinal |
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vertical |
up and down, increasing or decreasing the distance between the tube and the table |
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rotation |
allows the entire tub support to turn on its axis, changing the direction in which the tube arm is extended |
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roll |
permits angulation of the tube along the longitudinal axis and allows the tube to be aimed at the wall rather than the table |
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detent |
special mechanism that tends to stop a moving part in a specific location |
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radiographic table |
specialized unit that supports the patient, moves in several directions allowing vertical, tilt, and floating tabletop as well as a movable IR tray with a grid located under the top |
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fog |
caused by scatter radiation, a general exposure that comprises the visibility of the anatomic structures |
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bucky |
moving grid that incorporates a tray to hold an IR & is located beneath the table surface |
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grid |
incorporated into the bucky device between the tabletop and the IR, made of tissue thin lead strips mounted on edge with a radiolucent inter-spacing material |
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upright bucky/grid cabinet |
a device that holds the IR in the upright position for radiography. It is adjustable in height and can incorporate either a bucky or a stationary grid |
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upright image receptor unit |
a device that holds the IR and/or a bucky in a vertical position |
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stationary/slip grids |
do not move during an exposure. used for body parts measuring more than 10-12 cm in thickness |
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transformer |
provides the high voltage necessary to produce x-rays. connected to the x-ray tube via cables |
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control console |
located in the shielded control booth. input device for setting exposure factors, activating the exposure, and on/of powering of the unit |
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off/on |
controls the power to the control panel |
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mA |
allows the operator to set the Ma, the rate at which the x-rays are produced |
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kVp |
controls the kV, and therby the wavelength and penetrating power of the x-ray beam |
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timer |
controls the duration of the exposure |
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mAs |
determines the total quantity of radiation in an exposure |
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bucky |
activated the motor control of the bucky device so that the grid will move during the exposure |
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automatice exposure controls |
special settings are available on certain units that allow termination of the exposure when a certain quantity of radiation has reached the IR |
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meter (digital) readouts |
indicates status of the settings |
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prep (ready or rotor) switch |
prepares the tube for exposure and must be continuously activated until the exposure is complete |
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fluoroscope |
is an x-ray machine designed for direct viewing of the x-ray image. the equipment permits the radiologist to view and record radiographic images in motion in real time. image can be viewed in ambient light rather than the dark |
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spot films |
taken during fluoroscopy to record the image as seen on the fluoroscope |
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image intesifier |
in the form of a tower that fits over the fluoroscopic screen. |
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photomultiplier |
tubes that brighten and enhance the image |