REgistry part 6

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REgistry part 6
2015-07-22 15:49:31

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  1. Which of the following devices converts electrical energy to mechanical energy?
  2. what does a generator do
    converts mechanical energy into electrical energy
  3. Which of the following techniques is used to evaluate the dynamics of a part?
  4. The essential function of a phototimer is to
    terminate the x-ray exposure once the IR is correctly exposed
  5. Fluorescent light is collected from the image intensifier output phosphor and converted to an electronic video signal by the
    TV camera tube.
    coaxial cable.
    1 and 2
  6. what 6 parts are located on the low voltage primary side
    • The timer, circuit breaker, autotransformer, kilovoltage selector
    • switch, and (prereading) kilovoltage meter are all located in the
    • low-voltage circuit.
  7. All the following x-ray circuit devices are located between the
    incoming power supply and the primary coil of the high-voltage
    transformer except
    the rectifiers.
  8. The advantages of high-frequency generators over earlier types of generators include
    smaller size
    nearly constant potential
    lower patient dose.
  9. The device that receives the remnant beam, converts it into light, and then increases the brightness of that light is the
    image intensifier
  10. Which of the following voltage ripples is (are) produced by single-phase equipment
    100% voltage ripple
  11. The x-ray imaging system that uses a flat panel detector built into the x-ray table is
    direct digital radiography.
  12. TV camera tubes used in image intensification, such as the Plumbicon and Vidicon, function to
    transfer the output-phosphor image to the TV monitor.
  13. Leakage radiation must not exceed
    100mr at 1 meter
  14. The image intensifier's input phosphor generally is composed of
    cesium iodide
  15. The image intensifier's output phosphor generally is composed of
    zinc cadmium sulfide
  16. The movement of the IP through the transport system of a CR reader is referred to as the:
    Slow-scan direction
  17. Faster screens produce what kind of contrast
    short scale
  18. Using a 48-in. SID, how much OID must be introduced to magnify an object two times?
    24-in. OID
  19. When blue-emitting rare earth screens are matched properly with the correct film emulsion, what type of safelight should be used in the darkroom?
    1 and 2
  20. If a 6-in. OID is introduced during a particular radiographic examination, what change in SID will be necessary to overcome objectionable magnification?
    The SID must be increased by 42 in..
  21. The term latitude describes:
    an emulsion's ability to record a range of densities
    the degree of error tolerated with given exposure factors
    the conversion efficiency of a given intensifying screen
    • an emulsion's ability to record a range of densities
    • the degree of error tolerated with given exposure factors
  22. During film–screen imaging, the manifest image is formed
    in the developer solution
  23. Exposure rate will decrease with an increase in SID
    focal-spot size
  24. Which of the following technical changes would best serve to remedy the effect of very dissimilar tissue densities?
    High-kilovoltage exposure factors
  25. Compared with slow-speed screens, high-speed screens are often used:
    to minimize patient dose
    keep exposure time to a minimum
    image fine anatomic details
    1 and 2
  26. Which of the following is performed to check the correctness of the developing parameters?
  27. ______ is a device used to read optical density.
  28. what is the formula to determine image magnification
    image size over object size = SID over SOD
  29. Geometric unsharpness is most likely to be greater
    at the cathode end of the image.
  30. Which of the following terms is used to describe unsharp edges of tiny radiographic details?
  31. going from single phase to 3 phase 6 what do you do
    divied by 2/3
  32. going from 3 phase 6 pulse to single phase what do you do
    double it (mas)
  33. shape distortion is
    foreshortening, elongation) is caused by improper alignment of the tube, part, and image receptor.
  34. size distortion
    Size distortion, or magnification, is caused by too great an object–image distance or too short a source–image distance.
  35. The steeper the straight-line portion of a characteristic curve for a particular film,
    the slower is the film speed
    higher is the film contrast
    greater is the exposure latitude
    higher is film contrast
  36. The microswitch for controlling the amount of replenishment used in an automatic processor is located at the
    entrance roller
  37. If the center photocell were selected for a lateral projection of the lumbar spine that was positioned with the spinous processes instead of the vertebral bodies centered to the grid, how would the resulting radiograph look?
    The image would be underexposed.
  38. A particular milliampere-seconds value, regardless of the combination
    of milliamperes and time, will reproduce the same radiographic density.
    This is a statement of the
    inverse square law
  39. Geometric unsharpness is directly influenced by
  40. Which of the following affect(s) both the quantity and the quality of the primary beam?
    Half-value layer (HVL)
    Kilovoltage (kV)
    Milliamperage (mA)
    1 and 2
  41. Which of the following could be used to improve recorded detail?
    1. Slower screen/film combination
    2. Smaller focal-spot size
    3. Correct photocell selection
    1 and 2
  42. An exposed image plate will retain its original image quality for about
    8 hrs
  43. The auditory, or eustachian, tube extends from the nasopharynx to the
    middle ear
  44. The structures forming the brain stem include
    the pons
    the medulla oblongata
    the midbrain
  45. Structures involved in blowout fractures include the
    orbital floor
    inferior rectus muscle
    1 and 2
  46. With a patient in the PA position and the OML perpendicular to the table, a 15- to 20-degree caudal angulation would place the petrous ridges in the lower third of the orbit. To achieve the same result in a baby or a small child, it is necessary for the radiographer to modify the angulation to
    10-15 caudal to oml
  47. At what level do the carotid arteries bifurcate?
  48. What angle is formed by the median sagittal plane and the IR in the parieto-orbital projection (Rhese method) of the optic canal?
    53 deg
  49. With the patient's head in a PA position and the CR directed 20 degrees cephalad, which part of the mandible will be best visualized?
  50. In the PA position with chin extended (choice A) and OML 37 degrees to the IR (parietoacanthial projection, Waters method) where are the ridges/pyramids
    the petrous pyramids are projected below the maxillary sinuses.
  51. With the OML perpendicular to the IR in a caldwell where are the pyramids
    the petrous pyramids would fill the orbits (true PA).
  52. The ability of an x-ray unit to produce constant radiation output, at a given mA, using various combinations of mAs and time is called
  53. A repeated exposures at a given technique must provide consistent intensity is aka