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Numerical Control System Design and Image Reconstruction Research of Industrial CT

Author: WuJianHui
Tutor: LiGongPing
School: Lanzhou University
Course: Particle Physics and Nuclear Physics
Keywords: Industrial CT Physical design CNC system Image Reconstruction ART algorithm
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 59
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Abstract


Industrial CT (Computed Tomography) has an intuitive , accurate , non-destructive testing , etc. , which are widely used in aviation , aerospace, defense and other fields . Meanwhile , the theoretically industrial CT detection of objects is not its shape , material impact is rated as internationally recognized means of non-destructive testing . Based on the previous basis of the physical design of cone-beam CT . Ray source system selected 225KV X-ray machine ; detector system detector unit number of 128 × 128, unit size 1.Omm × 1.0mm detector array ; CNC system using a microcomputer , multi-axis controller , servo drive and motor structures; using ray source to the scanning center distance of 240mm, the distance of the detector to scan center for a 160mm the overall layout . The analysis results show that the CT system can better reach the default request . Image reconstruction algorithm plays an important role in the industrial CT . Research based on a number of scholars , C and MATLAB simulation experiments on the the 2D fault and cone-beam industrial CT . Single source , single detector , parallel beam scanning mode , select 128 × 128 classic Shepp-Logan head model for the reconstruction of the object , dimensional ART algorithm reconstruction prior knowledge , the initial value , different noise different projection of missing angle image quality and relaxation parameters selected . Experimental results show that the priori knowledge and a good initial value can improve the quality of the image , the number of different projections influence the selection of the relaxation parameters under different noise , uniform increase in the number of projection to to improve the missing angle scan the reconstructed image quality ; explored cone-beam CT scan image reconstruction . Experimental results show that the ray source, the scanning center , the distance between the detectors to select a reasonable distribution and projection evenly distributed in the range of 180 degrees can improve the quality of the reconstructed image , the projection angle evenly distributed at intervals of one to twice scan the first missing interval , the remaining projection is uniformly distributed in the range of angular intervals within the second missing can improve the quality of the reconstructed image in the case of a missing angle .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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