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IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology. RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY. Part 16.3: Optimization of protection in fluoroscopy Practical exercise. Overview / Objectives.

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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 16.3: Optimization of protection in fluoroscopy

Practical exercise

overview objectives
Overview / Objectives
  • To become familiar with quality control tests in fluoroscopy.
  • To measure the high contrast resolution
  • Interpretation of results

16.3: Optimization of protection in fluoroscopy

high contrast resolution
High contrast resolution

Purpose :

  • to measure the high contrast resolution of the fluoroscopy system

Equipment :

  • image quality phantom (Leeds phantom)
  • 2 mm Cu filter

16.3: Optimization of protection in fluoroscopy

slide5

Leeds Test Phantom 18FG to be used for routine image quality control

16.3: Optimization of protection in fluoroscopy

slide6

Details of the test object (Leeds Test 18FG) to be used for routine image quality control

16.3: Optimization of protection in fluoroscopy

slide7

Leeds test object is placed at the entrance of the image intensifier

16.3: Optimization of protection in fluoroscopy

slide8

Centering sometimes can be difficult

16.3: Optimization of protection in fluoroscopy

slide9

An alternative solution to centring the Leeds test object for image quality evaluation

16.3: Optimization of protection in fluoroscopy

slide10

Another possible solution— tape the Cu filter together with the test object.

16.3: Optimization of protection in fluoroscopy

do not forget
Do not forget
  • To angle test object at 45°

to TV scan lines

  • The best results are in center of intensifier field

16.3: Optimization of protection in fluoroscopy

slide12

Test object and filters placed at the image intensifier

16.3: Optimization of protection in fluoroscopy

slide13

Test object image (23 cm field size)

16.3: Optimization of protection in fluoroscopy

slide14

Test object image (17 cm field size)

16.3: Optimization of protection in fluoroscopy

the best results are in the center of image field
The best results are in the center of image field

16.3: Optimization of protection in fluoroscopy

do not forget to angle test object at 45 to tv raster lines to avoid moire patterns
Do not forget to angle test object at 45° to TV raster lines to avoid Moire patterns

16.3: Optimization of protection in fluoroscopy

high contrast resolution test object
High contrast resolution test object

16.3: Optimization of protection in fluoroscopy

leeds fluoroscopy phantom spatial resolution
Leeds Fluoroscopy Phantom (spatial resolution)
  • Incorporates:
  • a test pattern with bar patterns with spatial frequencies ranging from 0.5 to 5.0 cycles (line pairs) per mm.

16.3: Optimization of protection in fluoroscopy

leeds fluoroscopy phantom spatial resolution1
Leeds Fluoroscopy Phantom (spatial resolution)

16.3: Optimization of protection in fluoroscopy

spatial resolution
Spatial resolution

Interpretation of results

Analysis depends on the phantom used (Leeds)

The resolution limit is normally measured at the centre of the image field. It should correspond to the following values:

16.3: Optimization of protection in fluoroscopy

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