Fully 3D geometrical calibration for an X-ray grating-based imaging system

J Xray Sci Technol. 2016 Nov 22;24(6):821-836. doi: 10.3233/XST-160590.

Abstract

The Precision of geometric parameters is the key requirement for grating-based phase-contrast CT and attenuation-based CT in cone-beam geometry. By extending our fan-beam geometric calibration work via Locally Linear Embedding (LLE) into the cone-beam case, here we calibrate the geometric parameters of our in-house phase-contrast CT system with attenuation projection data. Numerical and experimental studies show that the LLE-based calibration method is feasible to calibrate 8 parameters of the cone-beam geometry that improves reconstruction quality significantly.

Keywords: Geometric calibration; cone-beam; locally linear embedding; phase-contrast CT.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calibration
  • Computer Simulation
  • Cone-Beam Computed Tomography / instrumentation
  • Cone-Beam Computed Tomography / methods*
  • Cone-Beam Computed Tomography / standards
  • Equipment Design
  • Humans
  • Imaging, Three-Dimensional / methods*
  • Models, Biological
  • Phantoms, Imaging