What happens to the focal spot as the x-ray tube target angle decreases?

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Multiple Choice

What happens to the focal spot as the x-ray tube target angle decreases?

Explanation:
The line focus principle explains this: the focal spot size seen on the image is the projection of the actual focal spot through the angled anode surface. When the target angle is smaller, that projection along the beam direction becomes shorter, so the effective focal spot on the radiograph decreases. In other words, a reduced anode angle yields a smaller focal spot on the image, which improves spatial resolution. (Note: this comes with trade-offs such as a stronger anode heel effect and heat loading considerations.)

The line focus principle explains this: the focal spot size seen on the image is the projection of the actual focal spot through the angled anode surface. When the target angle is smaller, that projection along the beam direction becomes shorter, so the effective focal spot on the radiograph decreases. In other words, a reduced anode angle yields a smaller focal spot on the image, which improves spatial resolution. (Note: this comes with trade-offs such as a stronger anode heel effect and heat loading considerations.)

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