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With a smaller focal spot, exposure time _______?

1) increases
2) decreases
3) stays the same

User Amedio
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1 Answer

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Final answer:

In imaging systems like X-rays, a smaller focal spot improves image sharpness but increases exposure time due to the limitations on X-ray photon production.

Step-by-step explanation:

When a smaller focal spot is used in an imaging system, such as with an X-ray tube, it leads to improved image sharpness by reducing the blur size. However, this comes at the cost of increased exposure time, because a smaller focal spot limits the amount of X-ray photons that can be produced at one time without overheating the anode. Thus, it requires a longer duration to achieve the necessary X-ray intensity for imaging, meaning the exposure time increases.

User Davydepauw
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