Application of expectation maximization to x-ray spectrum estimation for medical accelerators from transmission data

Emil Y. Sidky, Lifeng Yu, Xiaochuan Pan

Research output: Contribution to journalConference article

Abstract

Accurate computation of dose delivered to the patient depends on knowledge of the x-ray spectrum of therapy, x-ray beams. This work applies the expectation-maximization (EM) method to the problem of reconstructing the x-ray source spectrum from transmission data of Aluminum and Lead. The proposed EM method is compared to an algebraic approach for solving the corresponding linear system of equations.

Original languageEnglish (US)
Pages (from-to)856-860
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5368
Issue number2
DOIs
StatePublished - Jan 1 2004
EventMedical Imaging 2004: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 15 2004Feb 17 2004

Keywords

  • Expectation-maximization
  • Singular value decomposition
  • X-ray spectrum reconstruction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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