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The two main mechanisms by which X-rays interact with matter are via Compton scattering and absorption...

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Physics

  1. The two main mechanisms by which X-rays interact with matterare via Compton scattering and absorption by the photoelectriceffect. By referring to the dependence of these effects on X-rayenergy, explain what happens to X-ray image quality when usingexcessively high tube voltages?

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In screen film radiography the choice of xray tube voltagekV affected the image contrast this is no longer the case forany digital radiographic system In this example images wereobtained of a pelvic phantom at three kV values using a commercialcomputed radiography CR imaging plates All exposures wereperformed using phototiming This image was generated at 60 kV andrequired a relatively high radiation intensity of 141 mAs The Snumber generated by the system was 140 which corresponds to anaverage air kerma incident on the imaging plate of the order of 7mGy The L number generated by this imaging system was 23 whichmeans that the range of intensities incident on the plate differedby a factor of 200 or    See Answer
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