Vocab
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| Autotracking | A feature of modern x-ray systems that enables simultaneous vertical movement of an upright image receptor and overhead x-ray tube
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| Anode | Positive electrode of the x-ray tube
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| Bucky Mechanism | Grid that is an integral part of the x-ray table, located below the tabletop and above a cassette receptor tray. It decreases the amount of scatter radiation reaching the image receptor, which improves image quality increases contrast
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| Cassette | Lightproof holder for the image receptor. In computed radiography, the cassette holds the reusable photostimulable phosphor imaging plate; in conventional film-screen radiography, the cassette contains intensifying screens and a sheet of film
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| Cathode | Negative electrode of the x-ray tube
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| Collimator | Diaphragm or system of diaphragms made of an absorbing material; designed to define the dimensions and direction of a beam of radiation. This device consists of four rectilinear radiopaque blades that are adjustable to control the x-rays field size &shape
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| Digital Imaging | Acquisition of static images in an electronic fashion; conversion of images to a digital format for image manipulation, enhancement, storage, and networking
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| Diode | Electrical component that possesses polarity with a negative and positive terminal
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| DR Panel | Common term for a flat-panel digital image receptor using either indirect or direct digital capture technology
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| Flat-Panel Detector | Type of digital detector employing amorphous silicon or selenium material bonded with thin-film transistor technology for digital image creation and amplification
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| Fluoroscope | Device used for dynamic radiographic examinations; usually consists of an x-ray tube situated underneath the x-ray table and an electronic image detector situated over the x-ray table
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| Fluoroscopy | Examination by means of the fluoroscope, employing image intensification
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| Goniometer | Angulation scale incorporated into the x-ray tube-head assembly to indicate the degree of x-ray tube angle relative to the image receptor
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| Hard Copy | Radiographic image created on a polyester film medium
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| Latent Image | Invisible image created after x-ray exposure and before image processing
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| Longitudinal | Lengthwise, or along the long axis
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| Orthogonal | A perpendicular relationship between the x-ray beam central ray (CR) and image receptor
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| Overhead Tube Crane | Mechanical support for suspending the x-ray tube and collimator assembly from the ceiling of the radiography room
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| Picture Archival and Communication System (PACS) | Computer network for the transmission, viewing, and archival storage of medical images; often integrated into a larger hospital information system (HIS) and radiology information system (RIS)
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| Positive Beam Limitation (PBL) | Form of x-ray beam collimation of field size ensuring that the x-ray exposure in order to improve image quality and diagnostic yield
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| Postprocessing | Manipulation of medical images after they have been acquired through x-ray exposure in order to improve image quality and diagnostic yield
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| Pyrex Glass | Special type of glass that can withstand very high temperatures from the x-ray tube anode
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| Primary Barrier | A receptor of x-radiation that intercepts the primary beam and prevents exposure if not interlocked with the central ray of the x-ray beam
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| Radiolucent | Describes a material that easily transmits x-ray energy with very little absorption
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| Real-Time Images | Images in which dynamic patient motion is visualized instantly as fluoroscopic imaging is occurring
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| Remnant Radiation | All radiation exiting the patient during exposure and ultimately striking the receptor
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| Soft Copy | Visualization of x-ray images using a video monitor for display and interpretation
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| Spot Film | Equipment that permits the acquisition of static images during a dynamic fluoroscopic examination; images are recorded using film or are acquired digitally and stored electronically
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| Tether | Electrical wire connection between a digital detector and the x-ray generator and computer
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| Transverse | Placed crosswise; situated at right angles to the long axis of a part
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| Trendelenburg Tilt | Table tilt angle in which the patient's head and thorax are lower than his or her legs
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| Tube Angulation | Pivoting the tube at the point where it is attached to its support
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| Vertical | Perpendicular to the plane of the horizon
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| X-Ray Tube | Device that produces x-rays
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| X-Ray Tube Head | Equipment consisting of the x-ray tube, collimator, and operator controls; permits manipulation of the x-ray tube in many directions for proper positioning
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