Abstract
This paper introduces an industrial CT system of compact fan beam configuration which was designed and fabricated by Centre for Applications of Nuclear Technique in Industry (CANTI) for inspecting pipe and small scale industrial equipment. The system utilizes a Cs-137 or Se-75 isotopic source. The source is contained in a fan beam collimator made of lead. The slit size of the source collimator is 10 mm in width in the axial direction and the opening angle of the fan beam is 900. Twelve ½ inch x 1 inch NaI(Tl) scintillation detectors and multiple SCAs (Single Chanel Analyzer) are used to set up the detection system. Filtered Back Projection (FBP) and Expectation Maximization (EM) algorithms were used for reconstruction of CT images. Having compact configuration of third generation CT, the size of gantry is 900 mm which enable to scan an object with diameter of 600 mm whereas the detector arc in a conventional third generation configuration must be at least 1200mm to cover the same object.
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