Fast reconstruction of computerized tomography images based on the cross-entropy method

Wang, Qi, Wang, Huaxiang, Yan, Yong (2011) Fast reconstruction of computerized tomography images based on the cross-entropy method. Flow Measurement and Instrumentation, 22 (4). pp. 295-302. ISSN 0955-5986. (doi:10.1016/j.flowmeasinst.2011.03.010) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1016/j.flowmeasinst.2011.03.0...

Abstract

Computerized tomography (CT) has been applied to multi-phase flow measurement in recent years. Image reconstruction of CT often involves repeatedly solving large-dimensional matrix equations, which are computationally expensive, especially for the case of on-line flow regime identification. In this paper, a minimum cross-entropy (MCE) reconstruction based on wavelet multi-resolution processing, i.e., an MRMCE method, is proposed for fast reconstruction of CT images. Each row of the system’s matrix is transformed by 1-D wavelet decomposition. A regularized MCE solution is obtained using the simultaneous multiplicative algebraic reconstruction technique (SMART) at a coarse resolution level, where important information of the reconstructed image is contained. Then the solution in the finest resolution is obtained by inverse fast wavelet transformation (IFWT). Both computer simulation and experimental work were carried out for oil–gas two-phase flow regimes. Results obtained indicate that the MRMCE method improves the resolution of the reconstructed images and dramatically reduces the computation time compared with the traditional linear back-projection (LBP), MCE and algebraic reconstruction technique (ART) methods. Furthermore, the new method can also be used to accurately estimate the local time-averaged void fraction of dynamic two-phase flow. It is suitable for on-line multi-phase flow measurement.

Item Type: Article
DOI/Identification number: 10.1016/j.flowmeasinst.2011.03.010
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Instrumentation, Control and Embedded Systems
Depositing User: Tina Thompson
Date Deposited: 12 Dec 2014 15:12 UTC
Last Modified: 29 May 2019 13:54 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46006 (The current URI for this page, for reference purposes)
  • Depositors only (login required):