ASTM E1695-20
Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- Standard No.
- ASTM E1695-20
- Release Date
- 2020
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM E1695-20e1
- Latest
- ASTM E1695-20e1
- Scope
- 1.1 This test method provides instruction for determining the spatial resolution and contrast sensitivity in X-ray and γ-ray computed tomography (CT) volumes. The determination is based on examination of the CT volume of a uniform cylinder of material. The spatial resolution measurement (Modulation Transfer Function) is derived from an image analysis of the sharpness at the edges of the reconstructed cylinder slices. The contrast sensitivity measurement (Contrast Discrimination Function) is derived from an image analysis of the contrast and the statistical noise at the center of the cylinder slices. 1.2 This test method is more quantitative and less susceptible to interpretation than alternative approaches because the required cylinder is easy to fabricate and the analysis easy to perform. 1.3 This test method is not to predict the detectability of specific object features or flaws in a specific application. This is subject of IQI and RQI standards and standard practices. 1.4 This method tests and describes overall CT system performance. Performance tests of systems components such as X-ray tubes, gamma sources, and detectors are covered by separate documents, namely Guide E1000, Practice E2737, and Practice E2002; c.f. 2.1, which should be consulted for further system analysis. 1.5 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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.
ASTM E1695-20 Referenced Document
- ASTM E1000 Standard Guide for Radioscopy
- ASTM E1316 Standard Terminology for Nondestructive Examinations
- ASTM E1441 Standard Guide for Computed Tomography (CT)
- ASTM E1570 Standard Practice for Computed Tomographic (CT) Examination
- ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
- ASTM E2002 Standard Practice for Determining Total Image Unsharpness in Radiology
- ASTM E2737 Standard Practice for Digital Detector Array Performance Evaluation and Long-Term Stability
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E1695-20 history
- 2020 ASTM E1695-20e1 Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- 2020 ASTM E1695-20 Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- 1995 ASTM E1695-95(2013) Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- 1995 ASTM E1695-95(2006)e1 Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- 2001 ASTM E1695-95(2001) Standard Test Method for Measurement of Computed Tomography (CT) System Performance
- 2001 ASTM E1695-95 Standard Test Method for Measurement of Computed Tomography (CT) System Performance
