If magnification is performed without using a small focal spot, the resulting image will be magnified and what?

If magnification is performed without using a small focal spot, the resulting image will be magnified and what?

• A. Sharper
• B. Blurred
• C. More contrast
• D. Less noise

Answer: (B)

Magnification increases the visibility of geometric blurring from the focal spot, so keeping sharpness at higher magnification requires using a smaller focal spot. If you magnify without switching to the small focal spot, the unsharpness (penumbra) produced by the focal spot becomes more pronounced in the enlarged image, making it appear magnified and blurred. This is why the image ends up blurred rather than sharper or more contrasted; magnification itself doesn’t improve sharpness and can even reveal more noise or artifacts, but the dominant effect here is increased blur from the focal spot size.

Magnification increases the visibility of geometric blurring from the focal spot, so keeping sharpness at higher magnification requires using a smaller focal spot. If you magnify without switching to the small focal spot, the unsharpness (penumbra) produced by the focal spot becomes more pronounced in the enlarged image, making it appear magnified and blurred. This is why the image ends up blurred rather than sharper or more contrasted; magnification itself doesn’t improve sharpness and can even reveal more noise or artifacts, but the dominant effect here is increased blur from the focal spot size.