title: Dual kilovoltage at computed tomography: a prereconstruction method for estimation of effective atomic number and electron density.
abstract: Some of the prior efforts at using postreconstruction dual kilovoltage CT scans to obtain an effective atomic number and electron density are reviewed. A prereconstruction method which avoids beam hardening is applied to a phantom and a beginning clinical trial is described.
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging*; D006801:Humans; D014057:Tomography, X-Ray Computed / Q000379:methods*