Compensators for dose and scatter management in cone-beam computed tomography

S. A. Graham, D. J. Moseley, J. H. Siewerdsen, D. A. Jaffray

Research output: Contribution to journalArticlepeer-review

Abstract

The ability of compensators (e.g., bow-tie filters) designed for kV cone-beam computed tomography (CT) to reduce both scatter reaching the detector and dose to the patient is investigated. Scattered x rays reaching the detector are widely recognized as one of the most significant challenges to cone-beam CT imaging performance. With cone-beam CT gaining popularity as a method of guiding treatments in radiation therapy, any methods that have the potential to reduce the dose to patients and/or improve image quality should be investigated. Simple compensators with a design that could realistically be implemented on a cone-beam CT imaging system have been constructed to determine the magnitude of reduction of scatter and/or dose for various cone-beam CT imaging conditions. Depending on the situation, the compensators were shown to reduce x-ray scatter at the detector and dose to the patient by more than a factor of 2. Further optimization of the compensators is a possibility to achieve greater reductions in both scatter and dose.

Original languageEnglish (US)
Pages (from-to)2691-2703
Number of pages13
JournalMedical physics
Volume34
Issue number7
DOIs
StatePublished - 2007
Externally publishedYes

Keywords

  • Bow-tie filter
  • Compensator
  • Cone-beam CT
  • Dose
  • X-ray scatter

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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