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 focal spot becomes smaller due to the line-focus relationship. The actual focal spot on the anode is fixed, but what you see projected onto the image depends on the anode angle. When the target angle is decreased, the projection of the focal spot onto the imaging plane is compressed, yielding a smaller effective focal spot. This improves geometric sharpness, but it concentrates heat into a smaller area and increases the heel effect. So, as the angle decreases, the effective focal spot size decreases.

The focal spot becomes smaller due to the line-focus relationship. The actual focal spot on the anode is fixed, but what you see projected onto the image depends on the anode angle. When the target angle is decreased, the projection of the focal spot onto the imaging plane is compressed, yielding a smaller effective focal spot. This improves geometric sharpness, but it concentrates heat into a smaller area and increases the heel effect. So, as the angle decreases, the effective focal spot size decreases.

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