diagnostic imaging

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Across
  1. 2. Degree of difference between the light and dark areas of a radiograph.
  2. 5. A device that is used to measure x-ray exposure.
  3. 7. A substance that can be radiolucent or radiopaque and is administered to increase the radiographic contrast within an organ or system.
  4. 8. A positively charged electrode within the x-ray tube. Composed of molybdenum, copper, tungsten and graphite. It consists of a target and, in rotating anode tubes, a stator and rotor.
  5. 10. Contact  The amount of direct contact between the film and intensifying screens within a cassette.
  6. 14. as low as reasonably achievable
  7. 15. The smallest division of an element that exhibits all the properties and characteristics of the element.
  8. 16. A substance, tissue, or organ that is similar in appearance or function to another but differing in origin or development.
  9. 18. Automatically limits the size and shape of the primary beam to the size and shape of the image receptor.
  10. 21. (kV)  The potential difference applied to the x-ray tube that determines the speed at which the electrons in the tube current move.
  11. 22. Light that has been produced by an intensifying screen that exposes one emulsion and then “crosses over” the base layer of the film to expose the other emulsion
  12. 23. Radiation traveling in a straight line from source to receptor. Typically, this is the central ray.
  13. 24. A method of ordering the intensities of all radiations.
  14. 25. Due to the geometry of the angled anode target, the radiation intensity is greater on the cathode side because the radiation of the anode side is “cut off” and reabsorbed into the material of the anode. The anode angle is typically 11–15 degrees.
Down
  1. 1. Unsharpness resulting from patient motion.
  2. 2. A negatively charged electrode within the x-ray tube. It is comprised of a filament and a focusing cup
  3. 3. A method of imaging whereby the remnant radiation is converted into electrical signals which are then converted into an image within a computer.
  4. 4. The slope of the straight-line region of a film’s sensitometric curve.
  5. 6. Milliampere seconds—the time of the exposure. The “A” is capitalized.
  6. 9. The process by which the x-ray film is developed, fixed, and washed. The chemicals are diluted in water and saturate the emulsion of the film.
  7. 11. Real-time imaging of internal structures using a continuous beam of x-rays
  8. 12. Special filters added to the primary beam to alter its intensity. These types of filters are used to image anatomic areas that are nonuniform in makeup and assist in producing more consistent exposure to the image receptor.
  9. 13. Restriction/Collimation  Interchangeably used terms that refer to a decrease in the size of the projected radiation field.
  10. 17. Plate (IP)  The flexible plate inside the computed radiography cassette that receives the remnant radiation and converts it by means of a photostimulable phosphor into an image that can be read by a laser.
  11. 19. A device for limiting particles of radiation to a particular path, used to restrict the beam of radiation to a specific area.
  12. 20. Ratio  The ratio of the height of the lead strips to the distance between them. Typical grid ratios are 8:1 and 10:1.