GB/T 37158-2018Non-destructive testing—Test method for measuring the maximum detectable steel thickness by industrial computed tomography(CT) (English PDF)
无损检测 工业计算机层析成像（CT）检测最大可检测钢厚度测试方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 28, 2018
Implementation date
July 1, 2019
Scope
GB/T 37158-2018 is the English-translated version of 无损检测 工业计算机层析成像（CT）检测最大可检测钢厚度测试方法.
GB/T 37158-2018 sets out how to measure the maximum detectable steel thickness of an industrial computed tomography (CT) system. It applies to industrial CT systems with a ray energy of 225 keV and above, and uses the phantom described in GB/T 37122, made of round steel discs of different outer diameters.
The standard gives the testing requirements and steps, and defines the result: under specified spatial resolution, the outer diameter of the largest disc that still meets R of at least 10% and CNR of at least 3 is taken as the maximum detectable steel thickness.
It also lists what the testing record, the image data file and the test report must contain, and an annex recommends disc diameters. The standard was issued on 28 December 2018 and has applied since 1 July 2019.
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Document preview — GB/T 37158-2018
National Standard of the People's Republic of China
- ICS
- 19.100
- Classification
- J 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Testing requirements and steps5
- 5 Result evaluation6
- 6 Testing record and report9
- Annex A (informative) Recommended outer diameters of phantom round disc10
1 Scope
This Standard specifies the test method for measuring the maximum detectable steel thickness by industrial computed tomography (CT).
This Standard is applicable to the test for measuring the maximum detectable steel thickness indicator of industrial CT system of which the radian energy is 225 keV and above.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 12604.2, Non-destructive testing - Terminology - Terms used in radiographic testing
GB/T 29069, Non-destructive testing - Test method for measurement of industrial computed tomography (CT) system performance
GB/T 34365, Non-destructive testing - Terminology - Terms used in industrial computed tomography testing
GB/T 37122, Non-destructive testing - Phantom of maximum detectable steel thickness for industrial computed tomography (CT)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 12604.2 and GB/T 34365 as well as the following apply.
3.1 The maximum detectable steel thickness
For a specific CT system, under certain conditions such as scanning and […]
5 Result evaluation
5.3 Guideline
Under specified spatial resolution conditions, when R=10% and CNR=3, the outer diameter size of round disc of tested phantom is defined as the maximum detectable steel thickness. This thickness value usually requires multiple testing of fitting curves. To simplify testing, it usually regards the outer diameter size of round disc of testable maximum phantom as the maximum detectable steel thickness under specified spatial resolution conditions, when R>=10% and CNR>=3.
6 Testing record and report
6.1 Testing record
6.1.1 Testing record usually shall contain detailed records such as standard test piece name, test purpose, test equipment, ray source parameters, scanning mode, slice thickness, slice position, scanning time, field of view diameter, image matrix, reconstruction parameters, image description, evaluation criteria, tester, reviewer, test date.
6.1.2 Image data file shall generally include image number, standard test piece name, test purpose, test equipment, ray source parameters, scanning mode, slice thickness, slice position, scanning time, field of view diameter, image matrix, reconstruction parameters, etc.
6.2 Testing report
Testing report shall usually contain standard test piece name, test purpose, test equipment, test method, slice thickness, slice position, image matrix, test image, evaluation standard, evaluation result, tester, reviewer, approver, test date, report date. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 12604.2Non-destructive testing -- Terminology -- Terms used in radiographic testing
- GB/T 29069Non-destructive testing - Test method for measurement of industrial computed tomography (CT) system performance
- GB/T 37122Non-destructive testing—Phantom of maximum detectable steel thickness for industrial computed tomography(CT)
GB/T 34365
Similar standards
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Related Standards
GB/T 12604.2-2005 — Non-destructive testing -- Terminology -- Terms used in radiographic testing
GB/T 29069-2012 — Non-destructive testing - Test method for measurement of industrial computed tomography (CT) system performance
GB/T 37122-2018 — Non-destructive testing—Phantom of maximum detectable steel thickness for industrial computed tomography(CT)
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