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Radiography, Module 7 - Coggle Diagram
Radiography
Primary Beam
The primary beam is the concentrated stream of x-rays passing in a direct path from the x-ray tube. This radiation that leaves the tube is called the primary radiation
Dose levels within the primary beam can be relatively high and exposure to the primary beam can can cause localised, acute radiation damage.
The shape and size of the primary beam are controlled using a collimator. Rectangular collimators have been shown to significantly reduce the dose of radiation by narrowing the beam to a size just slightly larger than the intra-oral film.
The squared area that the primary beam covers as it strikes the patient and film/digital plate is called the radiation field.
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Step-Wedge Test
A step-wedge test is a simple but effective quality control test used to check that your dental radiography system - whether film based or digital - is functioning correctly and consistently. The step wedge itself is a small block of metal with varying thicknesses, shaped like steps.
When exposed to radiation, each step absorbs a different shade of grey on the image.
Diagnostically Acceptable (A): Images with no or minimal errors in patient preparation, exposure, positioning, or image processing, providing sufficient quality for clinical assessment.
Diagnostically Not Acceptable (N): Images containing errors in patient preparation, exposure, positioning, or image processing that compromise their diagnostic utility. No more than 5% of radiograph should be rated as N.
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