From the case:
Line focus principle (illustration)
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Diagram demonstrating the relationship between the anode angle (theta), the actual focal spot and the effective focal spot.
This relationship may be described by the line focus principle, where
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sin θ = effective focal spot / actual focal spot 1
Original illustration by Lachlan McKay.
Case Discussion
The line focus principle describes the relationship between the actual focal spot size and the effective focal spot size, as influenced by the anode angle 1.