radiation protection in diagnostic and interventional radiology
Download
Skip this Video
Download Presentation
RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY

Loading in 2 Seconds...

play fullscreen
1 / 13

RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY - PowerPoint PPT Presentation


  • 155 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY' - andren


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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

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

ad