X-ray Physics Review for 8th Q - PowerPoint PPT Presentation


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Focal Spot Size Selection. The x-ray beam is more tightly focused when the small focal spot is selected. The edge sharpness is improved because of less shadow or penumbra. . Small Focal Spot . AdvantagesReduced penumbraOFD can be increased with minimal loss of detail.DisadvantagesLower mA selection due to tube heatingLonger exposure times that can cause patient motion.

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