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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 19.09: Optimization of protection in Mammography Practical exercise. Overview.

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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 19.09: Optimization of protection in Mammography Practical exercise

  2. Overview • To be able to apply quality control protocol to screen-film mammography equipment • To assess darkroom fog from light leaks and safelights • Interpretation of results 19.09 : Optimization of protection in Mammography

  3. IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology Part 19.09: Optimization of protection in Mammography Dark room fog evaluation

  4. Darkroom fog • Remain in the darkroom for a minimum of five minutes with all the lights, including the safelights, turned off • Ensure that adjacent rooms are fully illuminated • Inspect all those areas likely to be a source of light leakage, e.g., around processor and doors. Also, check for indicator lights on the processor or other electronics in the room 19.09 : Optimization of protection in Mammography

  5. Darkroom fog • Correct all light leaks which are visible before continuing with this test. • Visually inspect safelights for light leaks, cracks in the filters or faded areas, and replace as needed. • Check the wattage of the safelight bulb, the distance from the safelight to the film handling surface, and the type of safelight filter. Be sure these meet the film manufacturer’s requirements. • Turn on all safelights for the next part of the test 19.09 : Optimization of protection in Mammography

  6. Darkroom fog • To measure the fog, uniformly expose a film to an optical density between 1.20 and 2.00 • Place the exposed sheet of film on the counter with the emulsion side up. • Cover half of the film with an opaque sheet, e.g., cardboard, and expose the film to the darkroom environment for 2 minutes 19.09 : Optimization of protection in Mammography

  7. Darkroom fog • Process the film • Measure the optical density using a densitometer on either side of the edge formed by the fog light (under the cardboard and area not covered by the cardboard). • The difference of the two densities is the fog level of the film, i.e., the amount of fog contributed by light sources in the darkroom 19.09 : Optimization of protection in Mammography

  8. Darkroom fog Limiting value :Fog < 0.05 Frequency :Initially, every six months or when light leakage is suspected Equipment :Cardboard to cover film, densitometer 19.09 : Optimization of protection in Mammography

  9. Darkroom fog • If the fog is greater than 0.05, corrective action is required. • There are three potential sources of fog– light from adjacent areas, safelights, and indicator lights. Determine the source of fog and take appropriate corrective action. • Note: It may be necessary to cover indicator lights with dark tape to reduce the amount of light in the darkroom. 19.09 : Optimization of protection in Mammography

  10. Where to Get More Information European protocol for the quality control of the physical and technical aspects of mammography screening. http://euref.org/index.php?option=com_phocadownload&view=category&id=1&Itemid=8 American College of Radiology Mammography Quality Control Manual, Reston VA, 1999. Quality Control in Diagnostic Imaging, Gray JE, Winkler NT, Stears J, Frank ED. Available at no cost. http://www.diquad.com/QC%20Book.html 19.09 : Optimization of protection in Mammography

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