What three factors determine the mammo spectrum?

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Multiple Choice

What three factors determine the mammo spectrum?

The spectrum is the range of photon energies produced by the X-ray tube and entering the breast. It’s shaped mainly by three beam parameters: peak kilovoltage (kVp), the material of the anode, and the filtration placed in the beam. - Increasing kVp raises the maximum photon energy and shifts the overall spectrum toward higher energies, changing contrast and dose. - The anode material affects the characteristic energies that contribute to the spectrum, subtly altering its shape. - Filtration removes the lower-energy photons from the beam, hardening the spectrum and reducing patient dose from photons that would be absorbed too readily. Other factors listed—such as exposure time, patient size, field size, distance, grid ratio, focal spot size, film speed, and development temperature—do not set the energy distribution of the emitted photons; they influence exposure, scatter, resolution, and film response but not the spectrum itself.

The spectrum is the range of photon energies produced by the X-ray tube and entering the breast. It’s shaped mainly by three beam parameters: peak kilovoltage (kVp), the material of the anode, and the filtration placed in the beam.

  • Increasing kVp raises the maximum photon energy and shifts the overall spectrum toward higher energies, changing contrast and dose.

  • The anode material affects the characteristic energies that contribute to the spectrum, subtly altering its shape.

  • Filtration removes the lower-energy photons from the beam, hardening the spectrum and reducing patient dose from photons that would be absorbed too readily.

Other factors listed—such as exposure time, patient size, field size, distance, grid ratio, focal spot size, film speed, and development temperature—do not set the energy distribution of the emitted photons; they influence exposure, scatter, resolution, and film response but not the spectrum itself.

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