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 16.5: Optimization of protection in fluoroscopy 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 16.5: Optimization of protection in fluoroscopy

Practical exercise


Overview

Overview

  • To become familiar with quality control tests in fluoroscopy

  • To measure the imaging geometry and sizing

  • Interpretation of results

16.5: Optimization of protection in fluoroscopy


Part 16 5 optimization of protection in fluoroscopy

IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology

Part 16.5: Optimization of protection in fluoroscopy

Image Distortion


Leeds fluoroscopy phantom image distortion

Leeds Fluoroscopy Phantom Image distortion

  • Pincushion distortion results because the input phosphor is curved but the output phosphor is flat

  • This results in a warped image, which bends straight lines inwards

  • Pincushion distortion is reduced when magnification modes are used

16.5: Optimization of protection in fluoroscopy


Image distortion

Image distortion

Pin-cushion

S-distortion

16.5: Optimization of protection in fluoroscopy


Leeds fluoroscopy phantom imaging geometry and sizing

Leeds Fluoroscopy PhantomImaging geometry and sizing

  • Incorporates:

  • a wire matrix of 20 mm square spacing with 10 mm minor indicators

16.5: Optimization of protection in fluoroscopy


Leeds fluoroscopy phantom imaging geometry and sizing1

Leeds Fluoroscopy PhantomImaging geometry and sizing

  • Interpretation of results

  • Measured field size > 0.85 nominal diameter of the intensifier

  • Integral distortion = (mean diagonal of large square - 1) n x mean diagonal of central square

  • less than 10 %.

16.5: 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


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