Signal to noise ratio and radiation dose as function of photon energy in mammography

Walter Huda, Andrzej Krol, Zhenxue Jing, John M Boone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

This study investigated the signal to noise ratio (SNR) and radiation dose as a function of photon energy in screen-film mammography. An analytical expression was derived for the SNR for monoenergetic photons incident on simulated masses and microcalcifications embedded in uniform slabs of Lucite. The mean dose, D, was determined by dividing the total energy deposited in the Lucite phantom by the corresponding phantom mass. SNR and dose data for different photon energies were normalized to a constant value of energy absorbed by a 34 mg/cm 2 Gd 2O 2S screen. A figure of merit (FOM), defined as SNR 2/D, permitted the optimum photon energy to be determined for each imaging task. For microcalcifications, the optimum energy was dependent on the size of the microcalcification, and increased from 19 keV for 100 μm to 22 keV for 500 μm imaged in a 4 cm Lucite phantom. The optimal photon energy for microcalcifications was 16-19 keV for a 2 cm phantom, increasing to 24-26 keV for an 8 cm phantom. For simulated masses of all diameters (2 mm to 10 mm) and thickness (0.15 to 0.6 mm), the optimal photon energy was ∼ 17 keV for a 2 cm phantom, and increased to ∼32 keV for an 8 cm phantom.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJ.T. Dobbins III, J.M. Boone
Pages355-363
Number of pages9
Volume3336
DOIs
StatePublished - 1998
Externally publishedYes
EventMedical Imaging 1998: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 22 1998Feb 24 1998

Other

OtherMedical Imaging 1998: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA
Period2/22/982/24/98

Keywords

  • Dose
  • Figure of merit
  • Image quality
  • Mammography
  • Monoenergetic photons
  • Signal to noise ratio

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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    Huda, W., Krol, A., Jing, Z., & Boone, J. M. (1998). Signal to noise ratio and radiation dose as function of photon energy in mammography. In J. T. Dobbins III, & J. M. Boone (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3336, pp. 355-363) https://doi.org/10.1117/12.317035