Which focal spot size is used for magnification imaging?

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For magnification imaging, you want to minimize geometric blur because magnification increases the distance between the breast and the detector, which makes any focal spot blur more noticeable. A very small focal spot, such as 0.1 mm, provides the finest resolution and keeps detail sharp at higher magnification. Larger focal spots introduce more unsharpness, reducing the ability to resolve tiny features like microcalcifications and fine tissue structures. Therefore, the smallest available focal spot size is used for magnification imaging.