title: Adaptive terahertz imaging using a virtual transceiver and coherence weighting.
abstract: We demonstrate an adaptive reconstruction technique to significantly improve the depth of focus and contrast of three-dimensional reflection-mode terahertz imaging. A laterally scanned virtual transceiver element records reflections from the object of interest. A synthetic aperture focusing technique maintains fine spatial resolution over a large image depth. Measuring the spatial coherence of the received signals across the transceiver aperture provides a non-iterative self-adaptive approach to significantly improve image contrast. Test images show a spatial resolution of 0.4 mm maintained over a 16 mm depth of field, and up to a 30 dB improvement in signal-to-noise ratio.
authors.affiliation: Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA.
authors.forename: Zhuopeng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Takashi
authors.initials: T
authors.lastname: Buma
mesh_terms: D000465:Algorithms; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D055069:Terahertz Imaging / Q000379:methods*