Improved Binary Back Projection Algorithm for Image Reconstruction used in Ultrasound Computed Tomography

DONG Xuejin1, SU Mingxu, CAI Xiaoshu, LI Longsheng, SHEN Jiaqi

Institute of Particle and Two­phase Flow Measurement,

University of Shanghai for Science and Technology, Shanghai 200093, China

1Author to whom correspondence should be addressed, E­mail: dongxuejin10@sina.com

ABSTRACT

A fast image reconstruction method based on Improved Binary Back Projection Algorithm (IBBPA) for on­line ultrasound computed tomography in solid­liquid flow is presented in this paper. Fan­shape beam ultrasonic transmitters are used to emit ultrasonic pulses. An ultrasonic transducer array, which consists of eight ultrasonic transducers used as both transmitters and receivers and 16 ultrasonic transducers used only as receivers, is used. The principle of IBBPA is presented in detail. The respective signals of scattering of a cylindrical wave by different distributions of rigid spherical particles at different number densities were simulated based on Boundary Element Method (BEM), and the results were input to IBBPA for image reconstruction, and the position and the size of each particle can be reconstructed accurately. As shown by the final results, the spatial image error (SIE) of IBBPA is visibly less than that of Binary Back Projection Algorithm (BBPA).

Keywords ultrasound computed tomography? binary back projection algorithm? image reconstruction? boundary element method