Computed tomography reconstructions using multiple discrete detectors

Computed tomography (CT) is being increasingly utilised as a powerful tool for industrial non-destructive testing applications. The present paper describes the work carried out on a second-generation CT imaging solution using flexible multiple discrete detectors. The concept has been implemented using a novel methodology, which uses simultaneous data acquisition, by four discrete detectors, arranged in a unique geometry, which take care of different illumined zones of the object being scanned. The methodology is based on principle of rotation of frame of reference. The paper provides insights on the two-step process, the first being the rebinning of angular datasets; and the second being the application of zonal and spacing corrections followed by filtered back-projection. Results have been presented for both simulated and actual samples. The novel methodology can be extended to a larger number of discrete detectors and be utilised effectively in NDE.