Optimization of Electrostatic Imaging Systems for Minimum Patient Dose or Minimum Exposure in Mammography

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Abstract
The X-ray photon energies that give the highest signal-to-noise ratios per unit of exposure or average dose in mammography are significantly greater than those used in current film/screen systems. Optimum photon energies for detection of calcifications in a range of thicknesses of water and fat were calculated. Soft-tissue targets were also considered. Comparison of the theoretical results and those obtained experimentally with the Stanton mammography phantom indicate that operation at less than optimum photon energies is a major cause of inefficiency in film/screen mammography. Electrostatic imaging systems, because of their processing flexibility, can operate at optimum photon energy levels, thus minimizing dose or exposure in breast cancer diagnosis.

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