Additive Manufacturing(AM) is the most advanced manufacturing process in case of medical and dental industry. Computed Tomography (CT) or Magnetic Resonance Imaging(MRI) images are the primary source to fabricate the medical models. CT scan data is stored in the form of Digital Imaging and Communication in Medicine (DICOM) format. Multi slice Spiral CT scanners are effective in capturing maximum data of human anatomy in minimum time. In processing of CT image acquisition some of parameters like

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... tube current, tube voltage and pitch play a major role. The aim of this work is to reduce the radiation dose, minimize dimensional and volumetric error by identifying the optimal input parameters. Considered three CT parameters with three levels to conduct the experiments.AL9 orthogonal array and S/N (Signal by Noise) ratio is used to analyze the CT acquisition data. The observation from the work is that the tube voltage is majorly responsible in case of resulting higher radiation dose, which has been minimized from 65.64 to 20.64mGy.Dimensional and volumetric errors have been reduced from 1.31to0.78 mm and 57188.91 to 12933.26 mm 3 respectively.