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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Radiation protection in diagnostic and interventional radiology

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

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


Part 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

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

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 alignment1

Light Field/X-Ray Field Alignment

Coins

Anode marker

Orientation marker

Light field

15.6: Optimization of protection in radiography


Alternative method

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

Alternative Method - Light Field Set for Second Exposure

15.6: Optimization of protection in radiography


Light field x ray field alignment2

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 alignment3

Light Field/X-Ray Field Alignment

Coin

shadows

Alignment error

X-ray Field

15.6: Optimization of protection in radiography


Exposed film alternative method

Exposed Film - Alternative Method

15.6: Optimization of protection in radiography


Acceptance limits

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

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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