GB/T 29034-2012 English PDF

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GB/T 29034-2012: Non-destructive testing -- Guide for industrial computed tomography (CT) imaging
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Basic data

Standard ID: GB/T 29034-2012 (GB/T29034-2012)
Description (Translated English): Non-destructive testing -- Guide for industrial computed tomography (CT) imaging
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 19.100
Word Count Estimation: 31,336
Quoted Standard: GB/T 12604.11
Regulation (derived from): National Standards Bulletin No. 41 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard deals with the industrial computer tomography (CT) detects relevant physical basis for mathematical foundation and the scanning method, discussed the industrial CT system's basic components, CT provides the basic performance parameters, elab

GB/T 29034-2012: Non-destructive testing -- Guide for industrial computed tomography (CT) imaging

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Non-destructive testing. Guide for industrial computed tomography (CT) imaging ICS 19.100 J04 National Standards of People's Republic of China Non-destructive testing - Industrial computed tomography (CT) Guide Issued on. 2012-12-31 2013-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅴ Introduction Ⅵ 1 Scope 1 2 Normative references 1 3 Terms and definitions Overview 4 1 4.1 Objective 1 Principle 1 4.2 CT 4.3 CT advantage 2 Limitations 4.4 CT 3 4.5 System Performance 3 4.5.1 Overview 3 4.5.2 Spatial resolution 4 4.5.3 Density Resolution 4 4.5.4 statistical noise 4 4.5.5 Artifacts 4 5 CT technology base 4 5.1 Overview 4 5 5.2 Physical Basis 5.3 mathematical basis 7 5.3.1 CT image 7 5.3.2 When converting Ray 7 5.3.3 Solving Equations reconstructed image 7 5.3.4 iterative reconstruction algorithm 8 5.3.5 Analytical Reconstruction Algorithm 9 5.4 scan mode 9 5.4.1 Overview 9 5.4.2 Generation Scanning 9 5.4.3 II Scanning 9 5.4.4 Three Generations Scanning 9 5.4.5 fourth generation scanning 11 5.4.6 cone beam scanning 11 12 5.4.7 Helical Scan 6 basic components of the system 12 6.1 Overview 12 Ray source system 13 6.2 6.3 detection system 13 6.4 mechanical scanning system 13 6.5 data acquisition and transmission system 13 6.6 control system 14 The image processing system 14 6.7 6.8 Radiation Security 14 7 Performance Indicators 14 7.1 Overview 14 7.2 Contrast 14 Definition 14 7.2.1 Contrast 7.2.2 Contrast difference 14 7.3 Resolution 15 7.3.1 Overview 15 7.3.2 PSF simple approximate 15 7.3.3 Influence sampled PSF 16 7.3.4 MTF curves 17 7.3.5 CT system MTF theoretical description 18 7.3.6 MTF curve drawing 18 7.4 Noise 19 7.4.1 Overview 19 7.4.2 Effect of noise on the reconstruction of 19 Estimated 19 7.4.3 Noise 7.4.4 Effect of noise on contrast 20 7.5 CDD curve 21 7.6 Performance Prediction and Test 22 7.6.1 System detection capability 22 7.6.2 Performance Prediction 22 7.6.3 Performance test 23 8 24 Precision and Bias Compare 1 CT and conventional radiographic image of FIG. 2 Figure 2 CT Works 3 3 ray interaction with matter 5 Comparison of three 4-ray and material interaction 5 Figure 5 a schematic three kinds of rays with matter interactions 6 Figure 6 Lambert Law schematic 6 7-ray scanning schematic 8 8 generation scanning 10 9 Scan II 10 Three Generations of 10 scanning 10 11 four generations of scanning 11 12 cone beam scanning 11 13 helical scan 12 14 industrial CT system components 13 Figure 15 details the background material over CT scans 15 Figure 16 CT system ray beam geometry Description 15 Figure 17 shows an image contrast qualitative difference Δμ details detected by CT after 16 Figure 18 details on the background of the actual CT scan results 17 19 width BW of PSF with a width of D, the pitch of the periodic detail 2D convolution result 17 Cylinder CT image obtained from the MTF process 19 Figure 20 Figure 21 contains details of the actual noise situation CT scan on the background material 20 Examples 22 and CDD detection capability curve 23 Theoretical and experimental CDD graph 23 actual CT system (constant c 8.5) 24

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard non-destructive testing by the National Standardization Technical Committee (SAC/TC56) and focal points. This standard was drafted. ICT Research Center, Chongqing University, Chinese Academy of Sciences, Ningbo Branch of Ordnance, Haitai detection technology limited the Division The company, Chongqing really measured Technology Co., Ltd., Nanchang Aeronautical University, Chongqing Communication Institute of PLA, Beijing Aeronautical integrated technology research The study. The main drafters of this standard. Forest Cheng, Wang Jue, Nipei Jun, Wu Guanhua, Zeng Li, Dennis, Zhangxiang Chun, Duan Xiao reef, Shen wide, well-being.

Introduction

Industrial Computer Tomography (CT) is an advanced non-destructive testing technology, has been widely used in aerospace, aviation, military, railway, Casting, machinery, shipbuilding, petroleum, chemical, nuclear industry and other fields. The standard industrial CT system's basic composition and performance parameters of evaluation methods Establishment, is instructive. Non-destructive testing - Industrial computed tomography (CT) Guide

1 Scope

This standard gives the physical basis of industrial computer tomography (CT) related to the detection, and scanning the mathematical basis to discuss work The basic components of industry CT system, provides the basic performance parameters CT, elaborated presentation and predict system performance. The industry standard is about the theory and application of CT imaging Getting Started Guide. This standard applies to the research, development, design, production and use of industrial CT technology and systems.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 12604.11 Terminology for nondestructive testing of industrial computer tomography (CT) to detect

3 Terms and Definitions

Terms and definitions GB/T 12604.11 defined apply to this document.

4 Overview

4.1 Objective This standard describes the definition and system performance parameters and system performance of industrial CT imaging and the basic principles of CT system performance parameters The relationship between indicators. Users determine the applicability of the CT system, you can refer to the present time to predict system performance or to develop new scanning method standard. Since CT technology in the development, the application scope expanding, the application is very complex, and therefore, this standard does not discuss specific subject Measurement techniques, such as scanning parameters selection, implementation, and data analysis methods, the scanning process. 4.2 CT principle CT is a radiation detection method, the resulting image is a distribution diagram of the linear attenuation coefficient of the object. Linear attenuation coefficient described Ray instantaneous rate of change of attenuation. Ray attenuation is due to the interaction of radiation and the object caused. Ray energy is below the peak 1.02MeV CT systems, the main interaction is the photoelectric effect and Compton scattering. Photoelectric effect depends on the absorbing medium The atomic number and density, play a major role in low-energy Compton scattering depends on the electron density of the material, from the main high energy effect. Linear attenuation coefficient and the ratio between the density of the material is able to reflect the physical basis of the CT image density distribution of the object. But the linear attenuation Coefficient is also related with the energy ray, this feature can sometimes obscure the density difference between CT images, but sometimes reinforced with similar density The contrast of different materials. Figure 1 shows the difference between CT and conventional radiography. As it can be seen from Figure 1, the conventional radiographic detection object properties The presence of superimposed images, can not determine the spatial position of the measured object. CT images from different angles to detect objects, can be more Accurate location information. Conventional radiography, the information slice plane "P" on the projector in a straight line "AA '", and CT images can be ......

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