title: Material characterization of dual-energy computed tomographic data using polar coordinates.
abstract: 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.
authors.affiliation: From the *Josef Lissner Laboratory for Biomedical Imaging, Institute for Clinical Radiology; and †Institute for Clinical Radiology, Ludwig Maximilians University Hospital Munich, Munich; and ‡Department of Radiology, University Hospitals Tübingen, Tübingen, Germany.
authors.forename: Lukas
authors.initials: L
authors.lastname: Havla
authors.forename: Michael
authors.initials: M
authors.lastname: Peller
authors.forename: Clemens
authors.initials: C
authors.lastname: Cyran
authors.forename: Konstantin
authors.initials: K
authors.lastname: Nikolaou
authors.forename: Maximilian
authors.initials: M
authors.lastname: Reiser
authors.forename: Olaf
authors.initials: O
authors.lastname: Dietrich
mesh_terms: D000465:Algorithms; D000818:Animals; D005260:Female; D009716:Numerical Analysis, Computer-Assisted; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015900:Radiography, Dual-Energy Scanned Projection / Q000295:instrumentation / Q000379:methods*; D051381:Rats; D011923:Rats, Nude; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*; D051598:Whole Body Imaging / Q000295:instrumentation / Q000379:methods