Grids in Radiography

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Questions and Answers

What is the purpose of a grid in radiography?

  • To increase the intensity of the X-ray beam
  • To absorb scatter radiation (correct)
  • To absorb primary radiation
  • To decrease the intensity of the X-ray beam

What is a grid ratio?

  • The ratio of variation in the direction of the incoming photon allowed without being absorbed by the grid (correct)
  • The ratio of primary radiation absorbed by the grid
  • The ratio of scatter radiation absorbed by the grid
  • The number of lead strips in a grid

What is the range of grid frequency?

  • 16 to 60
  • 40 to 72
  • 5 to 16
  • 60 to 196 (correct)

What is the term used to describe grids with lead strips aligned in the direction of the diverging primary x-ray beam?

<p>Focused grids (C)</p> Signup and view all the answers

What is the term used to describe the range of distances within which the grid will not absorb an undue amount of useful radiation?

<p>Focal range (A)</p> Signup and view all the answers

What is the purpose of interspacing material in a grid?

<p>To hold the lead strips in place (A)</p> Signup and view all the answers

What is the most commonly used SID in radiography?

<p>48 inches (C)</p> Signup and view all the answers

What is the range of focal range for grids with extra-long focal ranges?

<p>40 to 72 inches (B)</p> Signup and view all the answers

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Study Notes

Grids in Radiography

  • A grid is a device placed under the table between the patient and the IR to absorb scatter radiation.
  • Grids are constructed of tiny lead strips held in place by a radiolucent interspacing material.
  • The effectiveness of a grid is determined by the grid ratio, which ranges from 5:1 to 16:1.
  • The grid ratio determines how much variation in the direction of the incoming photon is allowed without the photon being absorbed by the grid.
  • Grids with the same ratio may have many strips close together or fewer strips farther apart, which is called the grid frequency.
  • Grid frequencies range from 60 to 196 lines/inch.
  • Grids for general-purpose use are called focused grids because the lead strips are aligned in the direction of the diverging primary x-ray beam.
  • The lead strips of a focused grid are precisely aligned with the x-ray beam at a specific source-image receptor distance (SID), which is called the grid radius.
  • The range of distances within which the grid will not absorb an undue amount of useful radiation is referred to as the focal range of the grid.
  • The SID used with a grid should always be within the grid’s focal range.
  • The most commonly used SIDs are 40, 48, and 72 inches, and each usually requires a different grid with a suitable focal range.
  • Grids with extra-long focal ranges are now available, some of which have a focal range of 40 to 72 inches.

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