ISO 15708-3:2017
Non-destructive testing — Radiation methods for computed tomography — Part 3: Operation and interpretation
ISO 15708-3:2017 presents an outline of the operation of a computed tomography (CT) system and the interpretation of results with the aim of providing the operator with technical information to enable the selection of suitable parameters.
It is applicable to industrial imaging (i.e. non-medical applications) and gives a consistent set of CT performance parameter definitions, including how those performance parameters relate to CT system specifications.
ISO 15708-3:2017 deals with computed axial tomography and excludes other types of tomography such as translational tomography and tomosynthesis.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Operational procedure
4.1 General
4.2 CT system set-up
4.2.1 General
4.2.2 Geometry
4.2.3 X-ray source
4.2.4 Detector
4.3 Reconstruction parameters
4.4 Visualization
4.5 Analysis and interpretation of CT images
4.5.1 General
4.5.2 Feature testing/defect testing
4.5.3 Dimensional testing
5 Requirements for acceptable results
5.1 Image quality parameters
5.1.1 Contrast
5.1.2 Noise
5.1.3 Signal to noise ratio
5.1.4 Contrast to noise ratio
5.1.5 Spatial resolution
5.2 Suitability of testing
5.3 CT examination interpretation and acceptance criteria
5.4 Records and reports
5.5 Artefacts
5.5.1 General
5.5.2 Beam hardening artefacts
5.5.3 Edge artefacts
5.5.4 Scattered radiation
5.5.5 Instabilities
5.5.6 Ring artefacts
5.5.7 Centre of rotation error artefacts
5.5.8 Motion artefacts
5.5.9 Artefacts due to an insufficient number of projections
5.5.10 Cone beam artefacts
Annex A (informative) Spatial resolution measurement using line pair gauges
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Operational procedure
4.1 General
4.2 CT system set-up
4.2.1 General
4.2.2 Geometry
4.2.3 X-ray source
4.2.4 Detector
4.3 Reconstruction parameters
4.4 Visualization
4.5 Analysis and interpretation of CT images
4.5.1 General
4.5.2 Feature testing/defect testing
4.5.3 Dimensional testing
5 Requirements for acceptable results
5.1 Image quality parameters
5.1.1 Contrast
5.1.2 Noise
5.1.3 Signal to noise ratio
5.1.4 Contrast to noise ratio
5.1.5 Spatial resolution
5.2 Suitability of testing
5.3 CT examination interpretation and acceptance criteria
5.4 Records and reports
5.5 Artefacts
5.5.1 General
5.5.2 Beam hardening artefacts
5.5.3 Edge artefacts
5.5.4 Scattered radiation
5.5.5 Instabilities
5.5.6 Ring artefacts
5.5.7 Centre of rotation error artefacts
5.5.8 Motion artefacts
5.5.9 Artefacts due to an insufficient number of projections
5.5.10 Cone beam artefacts
Annex A (informative) Spatial resolution measurement using line pair gauges
Bibliography