SIST EN ISO 15708-1:2025

Non-destructive testing - Radiation methods for computed tomography - Part 1: Terminology (ISO 15708-1:2024)

This document defines terms used in the field of computed tomography (CT). It presents vocabulary that is not only CT-specific but which also includes other more generic terms and definitions spanning imaging and radiography. Some of the definitions represent discussion points aimed at refocusing their terms in the specific context of computed tomography.

Zerstörungsfreie Prüfung - Durchstrahlungsverfahren für Computertomographie - Teil 1: Terminologie (ISO 15708-1:2024)

Essais non destructifs - Méthodes par rayonnements pour la tomographie informatisée - Partie 1: Terminologie (ISO 15708-1:2024)

Le présent document définit les termes utilisés dans le domaine de la tomographie informatisée (TI). Il présente le vocabulaire qui n’est pas seulement spécifique de la tomographie informatisée, mais qui comprend également d’autres termes et définitions plus génériques qui couvrent l'imagerie et la radiographie. Les définitions de certains de ces termes comportent un élément de discussion destiné à recentrer le terme dans le contexte plus spécifique de la tomographie informatisée.

Neporušitvene preiskave - Sevalne metode za računalniško tomografijo - 1. del: Terminologija (ISO 15708-1:2024)

Ta dokument opredeljuje izraze, ki se uporabljajo na področju računalniške tomografije (CT). Podaja besedišče, ki ni specifično le za računalniško tomografijo, ampak vsebuje tudi bolj splošne izraze in definicije slikanja in radiografije. Nekatere od definicij predstavljajo točke razprave, katerih namen je preusmeriti izraze v poseben kontekst računalniške tomografije.

General Information

• Status: Published
• Public Enquiry End Date: 20-Jun-2024
• Publication Date: 14-Jan-2025
• ICS: 01.040.19 - Testing (Vocabularies)
• ICS: 19.100 - Non-destructive testing
• Technical Committee: PKG - Testing of metallic materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Oct-2024
• Due Date: 04-Jan-2025
• Completion Date: 15-Jan-2025
• Ref Project: EN ISO 15708-1:2024 - Non-destructive testing - Radiation methods for computed tomography - Part 1: Vocabulary (ISO 15708-1:2024)

Relations

• Revises: SIST EN ISO 15708-1:2019 - Non-destructive testing - Radiation methods for computed tomography - Part 1: Terminology (ISO 15708-1:2017)
• Effective Date: 19-Jul-2023

Overview

EN ISO 15708-1:2024 - Non-destructive testing - Radiation methods for computed tomography - Part 1: Vocabulary (ISO 15708-1:2024) is the latest, third-edition terminology standard for computed tomography (CT) used in non-destructive testing (NDT). Prepared by ISO/TC 135 in collaboration with CEN/TC 138, this document defines CT-specific and related imaging/radiography terms (e.g., voxel, CT projection, reconstruction) and clarifies discussion points to refocus definitions in the CT context. It supersedes the earlier EN ISO 15708-1 (2019) and replaces ISO 15708-1:2017.

Key topics

The standard provides authoritative definitions and concise explanations for core CT and radiation-imaging concepts, including:

• CT image, CT slice, CT volume, CT grey value - terminology for 2D/3D image data and voxel-level values.
• CT projection, CT scan, CT system - acquisition geometry and system components.
• Scanning modes - cone beam CT, fan beam CT, parallel beam CT (definitions of ray-path geometries).
• Image formation & processing - reconstruction, sinogram, ray path.
• Physical interaction terms - absorption (photoelectric), Compton scattering, X‑ray attenuation, linear attenuation coefficient.
• Image quality effects - artefact, beam hardening, cupping effect, partial volume effect, density resolution.
• Measurement and QC terms - calibration template (phantom), region of interest (ROI), region of interest CT, slice thickness, pixel/voxel.
• Notes describing relationships between terms and corrected definitions (notably terms 3.8, 3.9, 3.20 and 3.27 in this edition).

The document contains no normative references and points users to ISO and IEC terminology databases for related definitions.

Applications

This vocabulary standard supports consistent communication, specification and interpretation across CT-based NDT activities:

• Standardizing terminology in inspection reports, procurement documents and technical specifications.
• Aligning software interfaces, training materials, and acceptance criteria for industrial CT systems.
• Supporting quality assurance, method development and inter-laboratory communication when evaluating CT images, artefacts and measurement results.
• Informing development of procedures for CT-based inspection of additive-manufactured parts, castings, composites, and assemblies where precise vocabulary improves reproducibility.

Who should use this standard

• NDT engineers and technicians working with industrial CT
• Radiography/CT system manufacturers and software developers
• Quality managers, certification bodies and inspectors
• Researchers and trainers involved in CT image analysis and method development
• Standards committees and regulatory bodies harmonizing CT terminology

Related standards

EN ISO 15708-1 is part of the ISO 15708 series on radiation methods for computed tomography. For additional context and related definitions consult the ISO Online Browsing Platform and IEC Electropedia. CEN members are required to implement the EN version as a national standard (endorsement deadline noted in the European foreword).

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2025
Neporušitvene preiskave - Sevalne metode za računalniško tomografijo - 1. del:
Terminologija (ISO 15708-1:2024)
Non-destructive testing - Radiation methods for computed tomography - Part 1:
Terminology (ISO 15708-1:2024)
Zerstörungsfreie Prüfung - Durchstrahlungsverfahren für Computertomographie - Teil 1:
Terminologie (ISO 15708-1:2024)
Essais non destructifs - Méthodes par rayonnements pour la tomographie informatisée -
Partie 1: Terminologie (ISO 15708-1:2024)
Ta slovenski standard je istoveten z: EN ISO 15708-1:2024
ICS:
01.040.19 Preskušanje (Slovarji) Testing (Vocabularies)
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 15708-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 01.040.19; 19.100 Supersedes EN ISO 15708-1:2019
English Version
Non-destructive testing - Radiation methods for computed
tomography - Part 1: Vocabulary (ISO 15708-1:2024)
Essais non destructifs - Méthodes par rayonnements Zerstörungsfreie Prüfung - Durchstrahlungsverfahren
pour la tomographie informatisée - Partie 1: für Computertomographie - Teil 1: Vokabular (ISO
Vocabulaire (ISO 15708-1:2024) 15708-1:2024)
This European Standard was approved by CEN on 29 July 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15708-1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15708-1:2024) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing" in collaboration with Technical Committee CEN/TC 138 “Non-destructive testing”
the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 15708-1:2019.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 15708-1:2024 has been approved by CEN as EN ISO 15708-1:2024 without any
modification.
International
Standard
ISO 15708-1
Third edition
Non-destructive testing —
2024-10
Radiation methods for computed
tomography —
Part 1:
Vocabulary
Essais non destructifs — Méthodes par rayonnements pour la
tomographie informatisée —
Partie 1: Vocabulaire
Reference number
ISO 15708-1:2024(en) © ISO 2024

ISO 15708-1:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 15708-1:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1

iii
ISO 15708-1:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criter
...