ASTM E1570-19
(Practice)Standard Practice for Fan Beam Computed Tomographic (CT) Examination
Standard Practice for Fan Beam Computed Tomographic (CT) Examination
SIGNIFICANCE AND USE
5.1 This practice establishes the basic parameters for the application and control of fan-beam CT examinations. This practice is written so it can be specified on the engineering drawing, specification, or contract. It will require a detailed procedure delineating the technique or procedure requirements and shall be approved by the Cognizant Engineering Organization (CEO).
5.2 The requirements in this practice shall be used when placing a CT system into NDT service and establishing a baseline of system performance measures. Monitoring the system performance over time shall be performed, including calibration procedures, performance measurements, and system maintenance in accordance with Section 9.
SCOPE
1.1 This practice establishes the minimum requirements for computed tomography (CT) examination of test objects using fan beam systems (systems that generate one or a few CT cross sectional slices at a time). The examination may be used to nondestructively disclose physical features or anomalies within a test object by providing radiological density and geometric measurements. This practice implicitly assumes the use of penetrating radiation, specifically X-ray and γ-ray.
1.2 CT is broadly applicable to any material or test object through which a beam of penetrating radiation passes. The principal advantage of CT is that it provides densitometric (that is, radiological density and geometry) images of thin cross sections through an object without the structural superposition in projection radiography.
1.3 There are areas in this practice that may require agreement between the purchaser and the supplier, or specific direction from the cognizant engineering organization. These items should be addressed in the purchase order or the contract. Generally, the items are application specific or performance related, or both.
1.4 Techniques and applications employed with CT are diverse. This practice is not intended to be limiting or restrictive. Refer to Guides E1441 and E1672 that provide additional information and guidance on CT fundamentals and tradeoffs in designing or purchasing a CT system, or both.
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Buy Standard
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1570 − 19
Standard Practice for
1
Fan Beam Computed Tomographic (CT) Examination
This standard is issued under the fixed designation E1570; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice establishes the minimum requirements for
ization established in the Decision on Principles for the
computed tomography (CT) examination of test objects using
Development of International Standards, Guides and Recom-
fan beam systems (systems that generate one or a few CTcross
mendations issued by the World Trade Organization Technical
sectional slices at a time). The examination may be used to
Barriers to Trade (TBT) Committee.
nondestructivelydisclosephysicalfeaturesoranomalieswithin
a test object by providing radiological density and geometric
2. Referenced Documents
measurements. This practice implicitly assumes the use of
2
2.1 ASTM Standards:
penetrating radiation, specifically X-ray and γ-ray.
E1316 Terminology for Nondestructive Examinations
1.2 CT is broadly applicable to any material or test object
E1441 Guide for Computed Tomography (CT) Imaging
through which a beam of penetrating radiation passes. The
E1672 Guide for Computed Tomography (CT) System Se-
principaladvantageofCTisthatitprovidesdensitometric(that
lection
is, radiological density and geometry) images of thin cross
E1695 Test Method for Measurement of Computed Tomog-
sections through an object without the structural superposition
raphy (CT) System Performance
in projection radiography.
E2339 Practice for Digital Imaging and Communication in
1.3 There are areas in this practice that may require agree-
Nondestructive Evaluation (DICONDE)
ment between the purchaser and the supplier, or specific
E2767 Practice for Digital Imaging and Communication in
direction from the cognizant engineering organization. These
Nondestructive Evaluation (DICONDE) for X-ray Com-
itemsshouldbeaddressedinthepurchaseorderorthecontract.
puted Tomography (CT) Test Methods
Generally, the items are application specific or performance
3
2.2 ASNT Documents:
related, or both.
SNT-TC-1A Recommended Practice for Personnel Qualifi-
1.4 Techniques and applications employed with CT are
cation and Certification in Nondestructive Testing
diverse. This practice is not intended to be limiting or restric-
ANSI/ASNT-CP-189 QualificationandCertificationofNon-
tive. Refer to Guides E1441 and E1672 that provide additional
destructive Testing Personnel
information and guidance on CTfundamentals and tradeoffs in
4
2.3 AIA Standard:
designing or purchasing a CT system, or both.
NAS-410 Certification and Qualification of Nondestructive
1.5 Units—The values stated in SI units are to be regarded
Testing Personnel
5
as standard. No other units of measurement are included in this
2.4 ISO Standards:
standard.
ISO 9712 International Standard for NondestructiveTesting
1.6 This standard does not purport to address all of the Personnel Qualification and Certification
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mine the applicability of regulatory limitations prior to use.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
1
This practice is under the jurisdiction of ASTM Committee E07 on Nonde- 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
4
structive Testing and is the direct responsibility of Subcommittee E07.01 on Available fromAerospace IndustriesAssociation ofAmerica, Inc. (AIA), 1000
Radiology (X and Gamma) Method. WilsonBlvd.,Suite1700,Arlington,VA22209-3928,http://www.aia-aerospace.org.
5
Current edition approved June 15, 2019. Published August 2019. Originally Available from International Organization for Standardization (ISO), ISO
approved in 1993. Last previous edition approved in 2011 as E1570 – 11. DOI: Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1570 − 11 E1570 − 19
Standard Practice for
1
Fan Beam Computed Tomographic (CT) Examination
This standard is issued under the fixed designation E1570; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This practice is establishes the minimum requirements for computed tomography (CT), which (CT) examination of test
objects using fan beam systems (systems that generate one or a few CT cross sectional slices at a time). The examination may be
used to nondestructively disclose physical features or anomalies within a test object by providing radiological density and
geometric measurements. This practice implicitly assumes the use of penetrating radiation, specifically X-ray and γ-ray.
1.2 CT systems utilize a set of transmission measurements made along paths through the test object from many different
directions. Each of the transmission measurements is digitized and stored in a computer, where they are subsequently reconstructed
by one of a variety of techniques. A treatment of CT principles is given in Guide E1441.
1.2 CT is broadly applicable to any material or test object through which a beam of penetrating radiation passes. The principal
advantage of CT is that it provides densitometric (that is, radiological density and geometry) images of thin cross sections through
an object without the structural superposition in projection radiography.
1.3 There are areas in this practice that may require agreement between the purchaser and the supplier, or specific direction from
the cognizant engineering organization. These items should be addressed in the purchase order or the contract. Generally, the items
are application specific or performance related, or both.
1.4 This practice describes procedures for performing CT examinations. Techniques and applications employed with CT are
diverse. This practice is to address the general use of not intended to be limiting or restrictive. Refer to Guides E1441 and E1672CT
technology and thereby facilitate its use. that provide additional information and guidance on CT fundamentals and tradeoffs in
designing or purchasing a CT system, or both.
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.For specific safety statements, see Section 8, NBS Handbook 114, and Federal
Standards 21 CFR 1020.40 and 29 CFR 1910.96.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
E1316 Terminology for Nondestructive Examinations
E1441 Guide for Computed Tomography (CT) Imaging
E1672 Guide for Computed Tomography (CT) System Selection
E1695 Test Method for Measurement of Computed Tomography (CT) System Performance
E2339 Practice for Digital Imaging and Communication in Nondestructive Evaluation (DICONDE)
1
This practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.01 on Radiology (X and
Gamma) Method.
Current edition approved July 1, 2011June 15, 2019. Published July 2011August 2019. Originally approved in 1993. Last previous edition approved in 20052011 as
ε1
E1570 - 00E1570 – 11.(2005) . DOI: 10.1520/E1570-11.10.1520/E1570-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.