title: Electric Field Dependence on Charge Collection of CdZnTe X-Ray Detectors.
abstract: In this study, the electric field dependence on the charge collection process of CdZnTe detectors, at different x-ray tube settings, within the x-ray diagnostic energy range, is investigated. In addition, the detector contrast at different applied bias voltages and x-ray tube settings have been experimentally determined. The experimental results suggest that an efficient charge collection process is obtained by increasing the applied bias voltage. Once the applied bias voltage is sufficiently high, charge collection becomes complete and the detector operates in the saturation region. This is a prerequisite for high contrast and spatial resolution. As a result, the detector contrast is enhanced significantly. Therefore, CdZnTe detectors appear to be potential candidates for digital radiographic applications.
authors.affiliation: Department of Biomedical Engineering, University of Akron, Akron, Ohio 44325.
authors.forename: G C
authors.initials: GC
authors.lastname: Giakos
authors.forename: B
authors.initials: B
authors.lastname: Pillai
authors.forename: S
authors.initials: S
authors.lastname: Vedantham
authors.forename: S
authors.initials: S
authors.lastname: Chowdhuri
authors.forename: J
authors.initials: J
authors.lastname: Odogba
authors.forename: A
authors.initials: A
authors.lastname: Dasgupta
authors.forename: V
authors.initials: V
authors.lastname: Vega-Lozada
authors.forename: R
authors.initials: R
authors.lastname: Guntupalli
authors.forename: S
authors.initials: S
authors.lastname: Suryanarayanan
authors.forename: R J
authors.initials: RJ
authors.lastname: Endorf
authors.forename: A
authors.initials: A
authors.lastname: Passalaqua
authors.forename: S
authors.initials: S
authors.lastname: Kollipara