The effective focal spot is the

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Quizplus · Accepted Answer

The effective focal spot refers to the area of the x-ray beam as it appears when viewed from the direction of the x-ray film or detector, essentially from below the x-ray tube. This is different from the actual focal spot, which is the physical area on the anode target where electrons collide to produce x-rays. The effective focal spot size is influenced by the angle of the anode and appears smaller than the actual focal spot due to this geometric effect, improving image resolution.

The Effective Focal Spot Is the