Radiation protection in diagnostic and interventional radiology
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RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY PowerPoint PPT Presentation


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IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology. RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY. Part 15.6: Optimization of protection in radiography Practical exercise. Overview.

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RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY

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IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology

RADIATION PROTECTION INDIAGNOSTIC ANDINTERVENTIONAL RADIOLOGY

Part 15.6: Optimization of protection in radiography

Practical exercise


Overview

  • Subject matter: quality control of general radiography system

  • Step by step procedure to be followed to implement the considered QC test

  • Beam collimation and Bucky tray alignment

  • Interpretation of results

15.6: Optimization of protection in radiography


IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology

Part 15.6: Optimization of protection in radiography

Beam collimation and Bucky tray alignment


What Minimum Equipment is Needed?

  • 6 coins

  • 24 X 30 cm cassette

  • Film

  • Ruler

15.6: Optimization of protection in radiography


Light Field/X-Ray Field Alignment

  • Method:

    • place loaded cassette on table at 100 cm focus-film distance (FFD)

    • collimate to ~ 20 x 20 cm field

    • place metal markers (e.g., coins) at each field edge plus one at anode end, and one at top of field

    • make an exposure of ~5 mAs at 70 kVp

    • develop the film

15.6: Optimization of protection in radiography


Light Field/X-Ray Field Alignment

Coins

Anode marker

Orientation marker

Light field

15.6: Optimization of protection in radiography


Alternative Method

  • Place two coins at each edge - touching at the light field edge

  • Make a slightly lower exposure, then open the light beam to include both coins, and take another exposure, about half the mAs of the first

  • This makes the coins visible even if the x-ray field is significantly mis-aligned

15.6: Optimization of protection in radiography


Alternative Method - Light Field Set for Second Exposure

15.6: Optimization of protection in radiography


Light Field/X-Ray Field Alignment

Analysis :

  • assure that you can see each coin

  • measure the distance between the coin and the x-ray beam edge

15.6: Optimization of protection in radiography


Light Field/X-Ray Field Alignment

Coin

shadows

Alignment error

X-ray Field

15.6: Optimization of protection in radiography


Exposed Film - Alternative Method

15.6: Optimization of protection in radiography


Acceptance limits

  • Light and x-ray field alignment should be within 2% of the source-to-image (cassette) distance.

  • Ideally, the alignment should be within 1%.

15.6: Optimization of protection in radiography


Where to Get More Information

Quality Control in Diagnostic Imaging, Gray JE, Winkler NT, Stears J, Frank ED. Available at no cost. http://www.diquad.com/QC%20Book.html

15.3: Optimization of protection in radiography


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