Material characterization of dual-energy computed tomographic data using polar coordinates

J Comput Assist Tomogr. 2015 Jan-Feb;39(1):134-9. doi: 10.1097/RCT.0000000000000157.


The purpose of this study was to evaluate a new dual-energy computed tomographic postprocessing approach on the basis of the transformation of dual-energy radiodensity data into polar coordinates. Given 2 corresponding dual-energy computed tomographic images, the attenuation data D(U1), D(U2) in Hounsfield units of both tube voltages (U1,U2) were transformed for each voxel to polar coordinates: r (distance to the radiodensity coordinate origin) is an approximate measure of electron density and φ (angle to the abscissa) differentiates between materials.

MeSH terms

  • Algorithms*
  • Animals
  • Female
  • Numerical Analysis, Computer-Assisted
  • Phantoms, Imaging
  • Radiographic Image Enhancement / methods*
  • Radiographic Image Interpretation, Computer-Assisted / methods*
  • Radiography, Dual-Energy Scanned Projection / instrumentation
  • Radiography, Dual-Energy Scanned Projection / methods*
  • Rats
  • Rats, Nude
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Tomography, X-Ray Computed / instrumentation
  • Tomography, X-Ray Computed / methods*
  • Whole Body Imaging / instrumentation
  • Whole Body Imaging / methods