Why choose a moly filter?

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The key idea is shaping the x‑ray spectrum to optimize mammography imaging. A molybdenum filter works with a molyben target by using molybdenum’s K-edge near 20 keV to trim the beam. This means photons with energies above about 20 keV are preferentially attenuated, softening the spectrum so there are more photons in the energy range that best visualize breast tissue while reducing higher-energy photons that contribute less to image formation and more to patient dose. This helps improve contrast for the breast—especially with a Mo/Mo setup—without changing how long the exposure lasts or creating color in the image.