RAD 100 ch 8

• 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
• Bucky Mechanism


  grid that is an integral part of the x-ray table, located below the tabletop and above a cassette tray; decreases the amount of scatter radiation reaching the image receptor, which increases contrast; moves during exposure so that no grid lines appear on the image
• Cassette


  light-proof case or holder for x-ray film
• Cathode


  Negative electrode
• Collimator


  Diaphragm or system of diaphragms made of an absorbing material; designed to define the dimensions and direction of a beam of radiation; device consisting of four rectilinear radiopaque blades that are adjustable to control x-ray field size and 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


  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 detector 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
• 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
• 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 Archiving 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 that ensures the x-ray exposure field is no larger than the receptor size
• Postprocessing


  Manipulation of medical images after they have been acquired through x-ray exposure, 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
• 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 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


  a 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 horizon
• X-Ray Tube


  Device that produces x-ray
• 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
• The component of the radiographic system that produces the radiation is the

  X-ray tube
• The selection of the radiographic exposure factors such as mAs and kVp is performed at the operator

  control console
• The quantity of electrons for x-ray exposure is determined by the mAs. This is calculated by


  multiplying the milliamperage by the exposure time
• The primary components of the x-ray tube important to x-ray production are the

  anode and cathode
• The component that controls the size and shape of the x-ray exposure field is the

  collimator assembly
• True digital image receptors are referred to as

  flat panel detectors
• All of the following are typical features of radiographic tables except

  the tabletop materials offer high attenuation to lower patient dose
• The component that supports and permits the x-ray tube to be moved in different directions is the

  tube stand or overhead tube crane assembly