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3. Theory of Focal Spot Reproduction
Why measure the focal spot?
RTI Slit Camera User’s Manual
1.0B
Figure 3–4 X-ray images for different sizes of the foci.
Figure 3–5 Reproduction of an object with different foci.
If the tube filament is worn-out and about to break you can often see this on the focal
spot and therefore be prepared to replace the tube when it breaks.