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Diagnostic Radiology IV

Factors affecting x-ray emission. Output of an x-ray tube described by the terms quality, quantity and exposureQuality describes penetrability of an x-ray beamQuantity refers to the number of photons comprising the beamExposure is nearly proportional to the energy fluence of the x-ray beam and th

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Diagnostic Radiology IV

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    1. Diagnostic Radiology IV Factors affecting x-ray emission Power ratings and heat loading

    2. Factors affecting x-ray emission Output of an x-ray tube described by the terms quality, quantity and exposure Quality describes penetrability of an x-ray beam Quantity refers to the number of photons comprising the beam Exposure is nearly proportional to the energy fluence of the x-ray beam and therefore has quality and quantity associated characteristics

    3. Factors (cont.) X-ray production efficiency, exposure, quality and quantity are determined by: X-ray tube target material Voltage Current Exposure time Beam filtration Generator waveform

    4. Target (anode) material Affects efficiency of bremsstrahlung radiation production Output exposure roughly proportional to atomic number Energies of characteristic x-rays depend on target material Target material affects quantity of bremsstrahlung radiation and the quality of characteristic radiation

    5. Tube voltage (kVp) Determines the maximum energy in the bremsstrahlung spectrum and affects the quality of the output spectrum Efficiency of x-ray production is directly related to tube voltage Exposure approximately proportional to the square of the kVp in the diagnostic range:

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