RAD100chp9/10

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ricksilentp
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38607
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RAD100chp9/10
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2010-10-12 23:06:14
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  1. What are the two important components of most radiographic exams?
    • patient preparation
    • contrast media
  2. What two ways are patients preparation performed?
    • Externally
    • Internally
  3. External preparation
    the removing of clothing, jewelry that may cover the area that xrays will pass through.
  4. Internal preparation
    exams that require cleansing enemas so that structures in the abdomen are not obscured by gas or fecal material
  5. contrast media
    solutions or gases introduced into the body to provide contrast on a radiograph between an organ and its surrounding tissue.
  6. 3 types of contrast media:
    • iodine-based media
    • barium-based media
    • air
  7. What is an ionic contrast media?
    Iodine
  8. What is a non-ionic contrast media?
    • Barium
    • it is inert and cannot be absorbed by the body
  9. What is the medium of choice for gastrointestinal studies?
    Barium sulfate
  10. when surgery is imminent or a perforated stomach is suspected which contrast media is the perfered ?
    a water soluble iodine contrast agent would be used.
  11. What is the primary contrast agent for chest radiography?
    Air
  12. Exams performed by the radiographer on particular regions of the body with the use of x-ray tube?
    radiographic studies
  13. What category are radiographs of the region above the neck?
    skull and headwork
  14. Skull and headwork studies are done primarily by these procedures?
    • CT
    • panoramic tomography
  15. Exams done to the skull and head region without CT or in junction are:
    • skull
    • facial bones
    • nasal bones
    • mandible
    • temporomandibular joints (TMJs)
    • sinuses
  16. The mandible and TMJs are primarily imaged using this?
    panoramic tomography
  17. Headwork imaging is usually performed for what reason(s)?
    • evaluate possible fractures
    • locate foreign bodies
    • examine abnormalities
  18. Areas such as the sella turcica, zygomatic arches, mastiods, and orbits are imaged using?
    CT
  19. What is the most commonly radiographed region of the body?
    Thoracic cavity
  20. Name studies of the thoracic cavity:
    • ribs
    • sternoclavicular joints (STJs)
    • sternum
    • lungs
  21. The extremities category is divided into what regions?
    • upper
    • lower
    • shoulder/pelvic
  22. Name upper extremity studies:
    • fingers
    • hands
    • wrists
    • forearms
    • elbows
    • humeri
    • shoulders
    • clavicles
    • acromioclavicular joints (ACJs)
    • scapulas
  23. Name lower extremity studies?
    • toes
    • feet
    • heels
    • ankles
    • lower legs
    • knees
    • patellae
    • femurs
    • hips
    • pelvis
  24. How many views are needed for bone studies?
    2 at right angles from each other
  25. Why are radiologic exams on extremities performed?
    • evaluate bone fractures
    • dislocations
    • arthritis
    • osteoporosis
    • tumors
  26. The spine category includes these studies:
    • cervical spine
    • thoracic spine
    • lumbar spine
    • sacroiliac joints
    • sacrum
    • coccyx
  27. A "live" radiological study
    fluoroscopic study
  28. study of the esophagus, requiring the patient to swallow a barium sulfate preparation.
    esophagram
  29. studies of the stomach and performed with the use of barium sulfate.
    upper gastrointestinal (GI) series
  30. Procedure used to evaluate hiatal hernias, peptic ulcers, and other stomach disorders.
    upper gastrointestinal series
  31. procedure involved in radiographing the abdomen every hour to watch the progress of barium through the small intestine?
    small bowel examination
  32. radiographic exams of the colon which introduce a barium solution.
    barium enema (BE)
  33. What is used in air-contrast studies of the colon to reduce cramping and peristalis.
    glucagon
  34. a study where air is added to a barium study for better visualization of abnormaties in the colon.
    air-contrast barium enema
  35. procedure where an iodinated contrast agent is injected into the bloodstream through a vein in the arm.
    Intravenous pyelogram (IVP)
  36. examination of the urinary system
    excretory urography
  37. a fluoroscopic study of the urinary system while it is filled with contrast agent
    cystogram
  38. a procedure where the patient urinates the contrast material while under fluoroscopy
    voiding cystourethrogram (VCUG)
  39. a fluoroscopic exam performed to diagnose anomalies in the biliary system or pancreas
    endoscopic retrograde cholangiopancreatography (ERCP)
  40. List fluoroscopic exams
    • esophagram
    • upper GI series
    • barium enema
    • urinary system studies
    • ERCP
  41. study that visualizes the arteries of a particular body regions. done with contrast and fluoro.
    arteriogram
  42. exam used to evaluate the structures in and around a joint space. uses fluoro and MRI
    arthogram
  43. examination of the uterus and fallopian tubes
    hysterosalpingogram
  44. procedure used to destroy stones in the kidney or ureter by using sonic shock waves.
    lithotripsy
  45. a radiographic study of the breast
    mammogram
  46. an examination of the subarachnoid space of the spinal cord.
    myelogram
  47. study of the salivary glands after they have been injected with contrast.
    sialogram
  48. study used to evaluate the veins in a particular area of the body.
    venogram
  49. venography is supplemented with and gradually being replaced by?
    sonography
  50. what components make up a diagnostic radiograph?
    • proper positioning
    • selects proper exposure factors
    • image interpretation
  51. what is the image recepter in CR?
    photostimulable phosphor plate
  52. what is the IR in direct digital radiography(DR)?
    a charged electronic device
  53. what is radiographic film composed of?
    emulsion spread on a thin transparent sheet of polymer plastic
  54. What is developer?
    the chemical solution that causes the crystals in the film that were struck by xrays to become black metallic silver
  55. elements used in digital radiography?
    • cesium iodide
    • gadolinium
    • oxysulfide
    • selenium
  56. Digital radiography can be produced in two methods:
    • direct
    • indirect
  57. indirect method of DR
    the xrays are first converted to light then the light is converted to electronic signal
  58. direct method
    xrays interact with selenium creating a n electronic signal
  59. advantages of digital radiography:
    • elimination of film and chemistry
    • quicker time for patients
    • image manipulation and adjustment
    • decreased patient dose
    • cautious of exposure creep
    • elimination of fog
    • image storage
  60. factors affecting the radiographic image
    • geometric factors
    • detail/resolution(measured in line pairs permm lp/mm)
    • film (10 lp/mm)
    • digital does not have the resolving ability of film, but contrast is greater
    • photographic properties
    • operator console/control panel
    • time (sec/msec)
    • voltage (kVp)
    • amperage (mA)
  61. Factors that affect quality of radiograph?
    • density * most important
    • contrast
    • distortion
    • detail
  62. What determines the quality of the xray beam?
    • kVp
    • higher the kVp the higher the energy
  63. What determines the quantity of xray?
    • milliampere (mA)
    • greater the mA the greater the amount of radiation
  64. what is density?
    is the amount of blackening
  65. What are the 5 radiographic densities in order of least to great in the human body:
    • gas/air (black)
    • fat
    • muscle
    • bone
    • metal (white)
  66. what is the inverse square law?
    I1/I2=(D2)2/(D1)2
  67. What is fog?
    • it is created by scatter radiation.
    • it increase the overall density of the radiographic image and it detracts from the overall quality of the image
  68. Name two devices that reduce exposure field size (beam limiters)?
    • cones
    • collimators
  69. What is contrast?
    a variation in density
  70. What are some advantages of beam limiting devices?
    • reduce exposure field
    • decrease amount of radiation
    • decrease scatter radiation
    • decrease fog
  71. Between where is the greatest contrast in the body demonstrated?
    bone and air
  72. What is a grid?
    • the device used to reduce scatter radiation.
    • placed between subject and IR
  73. What factors affect distortion?
    • beam alignment
    • OID
    • SID
  74. How can you reduce magnification?
    increase the SID
  75. Visibility of detail is influenced by:
    • contrast
    • visual acuity
    • density
  76. What is the focal spot?
    • the spot or source from which the xrays originate.
    • a large focal spot produces unsharp images
  77. radiographs obtained at intervals of several minutes during the time that the kidneys, ureters, and bladder are highlighted by contrast material
    IVP

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