Geometric calibration of a mobile C-arm for intraoperative cone-beam CT

M. J. Daly, Jeff Siewerdsen, Y. B. Cho, D. A. Jaffray, J. C. Irish

Research output: Contribution to journalArticle

Abstract

A geometric calibration method that determines a complete description of source-detector geometry was adapted to a mobile C-arm for cone-beam computed tomography (CBCT). The non-iterative calibration algorithm calculates a unique solution for the positions of the source (Xs, Ys, Zs), detector (Xd, Yd, Zd), piercing point (Uo, Vo), and detector rotation angles (φ,θ,η) based on projections of a phantom consisting of two plane-parallel circles of ball bearings encased in a cylindrical acrylic tube. The prototype C-arm system was based on a Siemens PowerMobil modified to provide flat-panel CBCT for image-guided interventions. The magnitude of geometric nonidealities in the source-detector orbit was measured, and the short-term (∼4 h) and long-term (∼6 months) reproducibility of the calibration was evaluated. The C-arm exhibits large geometric nonidealities due to mechanical flex, with maximum departures from the average semicircular orbit of Δ Uo =15.8 mm and Δ Vo =9.8 mm (for the piercing point), ΔX and ΔY=6-8 mm and ΔZ=1 mm (for the source and detector), and Δφ∼2.9°, Δθ∼1.9°, and Δη∼0.8° (for the detector tilt/rotation). Despite such significant departures from a semicircular orbit, these system parameters were found to be reproducible, and therefore correctable by geometric calibration. Short-term reproducibility was

Original languageEnglish (US)
Pages (from-to)2124-2136
Number of pages13
JournalMedical Physics
Volume35
Issue number5
DOIs
StatePublished - 2008
Externally publishedYes

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Cone-Beam Computed Tomography
Calibration
Orbit

Keywords

  • C-arm
  • Cone-beam CT
  • Flat-panel detector
  • Geometric calibration
  • Image-guided interventions
  • Imaging performance
  • Intraoperative imaging

ASJC Scopus subject areas

  • Biophysics

Cite this

Geometric calibration of a mobile C-arm for intraoperative cone-beam CT. / Daly, M. J.; Siewerdsen, Jeff; Cho, Y. B.; Jaffray, D. A.; Irish, J. C.

In: Medical Physics, Vol. 35, No. 5, 2008, p. 2124-2136.

Research output: Contribution to journalArticle

Daly, M. J. ; Siewerdsen, Jeff ; Cho, Y. B. ; Jaffray, D. A. ; Irish, J. C. / Geometric calibration of a mobile C-arm for intraoperative cone-beam CT. In: Medical Physics. 2008 ; Vol. 35, No. 5. pp. 2124-2136.
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