GB/T 37158-2018 English PDF (GBT37158-2018)

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GB/T 37158-2018: Non-destructive testing -- Test method for measuring the maximum detectable steel thickness by industrial computed tomography (CT)
GB/T 37158-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
Non-destructive testing - Test method for measuring
the maximum detectable steel thickness by industrial
computed tomography (CT)
ISSUED ON: DECEMBER 28, 2018
IMPLEMENTED ON: JULY 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Testing requirements and steps... 5 
5 Result evaluation ... 6 
6 Testing record and report ... 9 
Annex A (informative) Recommended outer diameters of phantom round disc
... 10 
Non-destructive testing - Test method for measuring
the maximum detectable steel thickness by industrial
computed tomography (CT)
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
detectable steel thickness indicator of the system is better than the outer
diameter size of phantom round disc.
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.