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Mammographic Equipment: Generators, Tube and Photon Production
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About the Author
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Introduction
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Electric Power Supplies
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AC versus DC Power Supplies
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AC Rectified for Medical Imaging
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Rectification of AC to DC Current
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Single-Phase versus Three-Phase Power
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Voltage Ripple and High Frequency Generators
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Minimizing Voltage Ripple
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How High-Frequency Circuits Benefit X-ray Production
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Advantages of High-Speed Generators
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Cathode and Anode Considerations
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Cathode Considerations
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Anode Composition
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Anode Composition and Photon Energy (keV): Brems Production
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Anode Composition and Photon Energy: Characteristic Production
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Common Anode/Target Elements
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Photoelectric Effect, Contrast and Exposure
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Beam Filtration
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Optimum Beam Filtration and the X-ray Tube Window
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Beam Geometry Considerations
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Line Focus Principle
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Effective versus Actual Focal Spot
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Target Angulation Considerations
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Effective Focal Spot and Tube Angulation
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Manipulation of Tube on Cathode Side
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Anode Heel Effect and Tube Position
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Application
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Conclusion
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References
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