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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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

  • 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


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

  • 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

Pin-cushion

S-distortion

16.5: Optimization of protection in fluoroscopy


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 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

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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