Radiography and Standard Distances
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Questions and Answers

When is a larger SID of 72 inches (180 cm) used in radiography?

  • For chest imaging to reduce magnification and provide a more accurate size representation (correct)
  • For head imaging to minimize scatter radiation
  • For extremity imaging to enhance magnification and improve detail visibility
  • For abdominal imaging to increase contrast and resolution

    • What are the standard distances for SID in radiography?

  • 30-inch (75 cm) and 50-inch (125 cm)
  • 36-inch (90 cm) and 60-inch (150 cm)
  • 40-inch (100 cm) and 48-inch (120 cm) (correct)
  • 42-inch (105 cm) and 54-inch (135 cm)

    • What adjustment is required for mAs when the SID is adjusted from 72 inches (180 cm) to 56 inches (140 cm)?

  • Halving the mAs (correct)
  • Quadrupling the mAs
  • Doubling the mAs
  • Maintaining the same mAs

    • In what scenarios may standard distances for SID not be feasible?

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