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Chapter 8
Vocab
| Term | Definition |
|---|---|
| Autotracking | A feature of modern x-ray systems that enables simultaneous vertical movement of an upright image receptor and overhead x-ray tube |
| Anode | Positive electrode of the x-ray tube |
| 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 |
| 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 |
| Cathode | Negative electrode of the x-ray tube |
| 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 |
| Digital Imaging | Acquisition of static images in an electronic fashion; conversion of images to a digital format for image manipulation, enhancement, storage, and networking |
| Diode | Electrical component that possesses polarity with a negative and positive terminal |
| DR Panel | Common term for a flat-panel digital image receptor using either indirect or direct digital capture technology |
| 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 |
| 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 |
| Fluoroscopy | Examination by means of the fluoroscope, employing image intensification |
| 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 |
| Hard Copy | Radiographic image created on a polyester film medium |
| Latent Image | Invisible image created after x-ray exposure and before image processing |
| Longitudinal | Lengthwise, or along the long axis |
| Orthogonal | A perpendicular relationship between the x-ray beam central ray (CR) and image receptor |
| Overhead Tube Crane | Mechanical support for suspending the x-ray tube and collimator assembly from the ceiling of the radiography room |
| 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) |
| 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 |
| Postprocessing | Manipulation of medical images after they have been acquired through x-ray exposure in order to improve image quality and diagnostic yield |
| Pyrex Glass | Special type of glass that can withstand very high temperatures from the x-ray tube anode |
| 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 |
| Radiolucent | Describes a material that easily transmits x-ray energy with very little absorption |
| Real-Time Images | Images in which dynamic patient motion is visualized instantly as fluoroscopic imaging is occurring |
| Remnant Radiation | All radiation exiting the patient during exposure and ultimately striking the receptor |
| Soft Copy | Visualization of x-ray images using a video monitor for display and interpretation |
| 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 |
| Tether | Electrical wire connection between a digital detector and the x-ray generator and computer |
| Transverse | Placed crosswise; situated at right angles to the long axis of a part |
| Trendelenburg Tilt | Table tilt angle in which the patient's head and thorax are lower than his or her legs |
| Tube Angulation | Pivoting the tube at the point where it is attached to its support |
| Vertical | Perpendicular to the plane of the horizon |
| X-Ray Tube | Device that produces x-rays |
| 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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kmccameron
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