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RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY

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

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  1. 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

  2. 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

  3. IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology Part 16.3: Optimization of protection in fluoroscopy High contrast spatial resolution

  4. 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

  5. Leeds Test Phantom 18FG to be used for routine image quality control 16.3: Optimization of protection in fluoroscopy

  6. Details of the test object (Leeds Test 18FG) to be used for routine image quality control 16.3: Optimization of protection in fluoroscopy

  7. Leeds test object is placed at the entrance of the image intensifier 16.3: Optimization of protection in fluoroscopy

  8. Centering sometimes can be difficult 16.3: Optimization of protection in fluoroscopy

  9. An alternative solution to centring the Leeds test object for image quality evaluation 16.3: Optimization of protection in fluoroscopy

  10. Another possible solution— tape the Cu filter together with the test object. 16.3: Optimization of protection in fluoroscopy

  11. 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

  12. Test object and filters placed at the image intensifier 16.3: Optimization of protection in fluoroscopy

  13. Test object image (23 cm field size) 16.3: Optimization of protection in fluoroscopy

  14. Test object image (17 cm field size) 16.3: Optimization of protection in fluoroscopy

  15. The best results are in the center of image field 16.3: Optimization of protection in fluoroscopy

  16. Do not forget to angle test object at 45° to TV raster lines to avoid Moire patterns 16.3: Optimization of protection in fluoroscopy

  17. High contrast resolution test object 16.3: Optimization of protection in fluoroscopy

  18. 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

  19. Leeds Fluoroscopy Phantom (spatial resolution) 16.3: Optimization of protection in fluoroscopy

  20. 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

  21. 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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