Contrast and dose with Mo-Mo, Mo-Rh, and Rh-Rh target-filter combinations in mammography.

Academic Article

Abstract

  • PURPOSE: To study the effect of three mammography target-filter combinations on contrast and dose. MATERIALS AND METHODS: With screen-film sensitometry, the contrast of a calcification target embedded in simulated breast tissue was measured for three target-filter combinations--molybdenum-molybdenum (Mo-Mo), molybdenum rhodium (Mo-Rh), and rhodium-rhodium (Rh-Rh)--as a function of x-ray tube potential, breast thickness, and breast composition. The corresponding average glandular tissue doses were also determined. RESULTS: Contrast and dose decreased with increasing kilovolt peak with all three target-filter combinations. Contrast was highest for Mo-Mo and lowest for Rh-Rh for images exposed with a low kilovoltage (< 29 kVp). For thick or radiographically dense phantoms, the contrast produced with Mo-Mo was less than or equal to that produced by the other two x-ray spectra when a higher kilovoltage (> or = 29 kVp) was selected. Average glandular dose was greatest for Mo-Mo and lowest for Rh-Rh for all phantom thicknesses, breast compositions, and tube potentials studied. CONCLUSIONS: For the thick or dense breast, the alternative target-filter selections can achieve contrast comparable to or better than that obtainable with Mo-Mo while using a smaller dose.
  • Published In

  • Radiology  Journal
  • Keywords

  • Breast, Female, Humans, Mammography, Models, Structural, Molybdenum, Radiation Dosage, Rhodium, Technology, Radiologic
  • Digital Object Identifier (doi)

    Author List

  • Gingold EL; Wu X; Barnes GT
  • Start Page

  • 639
  • End Page

  • 644
  • Volume

  • 195
  • Issue

  • 3