Physics of Radiography [email protected]
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Transcript of Physics of Radiography [email protected]
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Physics of Radiography• Structure of an atom• Wave theory• Quantum theory of electromagnetic radiation• Physical properties of X-rays• X-ray spectra (continuous and emission line)• X-ray tube• Types of X-ray tube and power supplies• Compton scattering• Absorption process – matter & materials• Dosimetry
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Physics of Radiography• Structure of an atom
Properties of sub-atomic particles Structure of atom Energy levels Electron configuration
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Physics of Radiography• Wave theory
Wave terminology Wave equation to calculate frequency and
wavelength
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Physics of Radiography• Quantum theory of electromagnetic radiation
Quantisation of energy The photon Wave particle duality
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Physics of Radiography• Physical properties of X-rays
X-ray photon energies Frequency & wavelength of X-rays
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Physics of Radiography• X-ray spectra (continuous and emission line)
Electronic transitions Line and continuous spectra Effect on spectra of varying accelerating voltage Maximum photon energy
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Physics of Radiography• X-ray tube
Diagram of the x-ray tube Calculate electron kinetic energy (J) Convert J to eV
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Physics of Radiography• Types of X-ray tube and power supplies
Power supply for electron tube High anode-cathode voltage Effect of high cathode current
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Physics of Radiography• Compton scattering
Simple scattering Compton scattering Photoelectric effect Pair production
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Physics of Radiography• Absorption process – matter & materials
Material thickness Different materials Attenuation Photographic image Image quality Image intensifiers
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Physics of Radiography• Dosimetry
Absorbed dose, dose equivalent, effective dose Units ALARA principle