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TU-E-217BCD-01: X-Ray Spectra for Breast CT.

K Kontson1,2, R Jennings1,2, I Kyprianou1,2

  • 1University of Maryland Department of Bioengineering, College Park, MD.

Medical Physics
|May 19, 2017
PubMed
Summary

Optimizing x-ray spectra for breast CT requires balancing dose efficiency and tube loading. Voltages above 40 kVp with lanthanide filters under 0.3 mm offer the best performance for dedicated breast imaging.

Keywords:
Cone beam computed tomographyLanthanidesMedical image noise

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Area of Science:

  • Medical Imaging
  • Radiological Physics

Background:

  • Dedicated breast CT requires specific x-ray spectra for optimal imaging.
  • Realistic constraints of tube loading must be considered for clinical feasibility.

Purpose of the Study:

  • To evaluate various x-ray spectra for dedicated breast CT.
  • To assess suitability considering tube loading limitations.

Main Methods:

  • A theoretical model was developed and extended for poly-energetic spectra.
  • Simulations considered object size, tube voltage, and lanthanide filter parameters.
  • Experiments with a cone-beam CT phantom verified computational findings.

Main Results:

  • Dose efficiency plateaus above 0.4 mm filter thickness for constant contrast-to-noise ratio (CNR).
  • Prohibitive power requirements arise for filter thicknesses exceeding 0.3 mm.
  • Optimal performance is achieved with lanthanide filters not exceeding 0.3 mm.

Conclusions:

  • X-ray spectra generated above 40 kVp offer the best balance between dose efficiency and tube loading.
  • Lanthanide filter thicknesses beyond 0.3 mm provide minimal additional benefit.