Week 2 Focal Spot & SID 29

Week 2 Focal Spot & SID 29 - Element of Image...

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Element of Image Sharpness Recorded detail is the sharpness of the lines of the image. Distortion is the misrepresantation of of the true size or shape of the image compared to the object.
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What impacts the recorded detail? Focal spot size Object to Image Distance (OID) or Object to Film Distance (OFD) Source to Image Distance (SID) or Focal Film Distance (FFD) Motion
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What impacts Distortion? Object Image Distance (OID) or Object Film Distance (OFD) Source Image Distance (SID) or Focal Film Distance (FFD) Object Alignment Film Alignment Central Ray Alignment
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Selecting the Focal Spot The operator has total control over the focal spot. The “S” indicates the small focal spot is selected.
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Selecting the Focal Spot Selecting “S” will mean the voltage will be applied to the small filament. Selecting “L” will apply the voltage to the large filament.
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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 .
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Spot Advantages Reduced penumbra OFD can be increased with minimal loss of detail.
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Week 2 Focal Spot & SID 29 - Element of Image...

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