ASTM E1647-16
Standard Practice for Determining Contrast Sensitivity in Radiology
- Standard No.
- ASTM E1647-16
- Release Date
- 2016
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM E1647-16(2022)
- Latest
- ASTM E1647-16(2022)
- Scope
5.1 The contrast sensitivity gauge measures contrast sensitivity independent of the imaging system spatial resolution limitations. The thickness recess dimensions of the contrast sensitivity gauge are large with respect to the unsharpness limitations of most imaging systems. Four levels of contrast sensitivity are measured: 48201;%, 38201;%, 28201;%, and 18201;%.
5.2 The contrast sensitivity gauge is intended for use in conjunction with a high-contrast resolution measuring gauge, such as Practice E2002, ISO 192328201;–8201;5 Duplex Wire Image Quality Indicator7, or a line-pair gauge. Such gauges measure system unsharpness essentially independent of the imaging system's contrast sensitivity. Such measurements are appropriate for the qualification and performance monitoring of radiographic and radioscopic imaging systems with film, realtime devices, Computed Radiography (CR) and Digital Detector Arrays (DDA).
5.3 Radioscopic/radiographic system performance may be specified by combining the measured contrast sensitivity expressed as a percentage with the unsharpness expressed in millimetres of unsharpness. For the duplex wire image quality indicator, the unsharpness is equal to twice the wire diameter. For the line pair gauge, the unsharpness is equal to the reciprocal of the line-pair/mm value. As an example, an imaging system that exhibits 28201;% contrast sensitivity and images the 0.1 mm paired wires of the duplex wire IQI (equivalent to imaging 5 line-pairs/millimeter resolution on a line-pair gauge) performs at a 28201;%–0.2 mm sensitivity level. A standard method of evaluating overall radioscopic system performance is given in Practice E1411 and in EN8201;13068–1. A conversion table from duplex wire read out to lp/mm can be found in Practice E2002. For CR system performance evaluation, this contrast sensitivity gauge is used in Practice E2445.
1.1 This practice covers the design and material selection of a contrast sensitivity measuring gauge used to determine the minimum change in material thickness or density that may be imaged without regard to unsharpness limitations.
1.2 This practice is applicable to transmitted-beam radiographic imaging systems (film, radioscopy, computed radiography, and digital detector array image detectors) utilizing X-ray and gamma ray radiation sources.
1.3 The values stated in inch-pound units are to be regarded as standard. The SI units given in parentheses are for information only.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific safety statements, see NIST/ANSI Handbook 114 Section 8, Code of Federal Regulations 21 CFR 1020.40 and 29 CFR 1910.96.
ASTM E1647-16 Referenced Document
- ASTM B139/B139M Standard Specification for Phosphor Bronze Rod, Bar, and Shapes
- ASTM B150/B150M Standard Specification for Aluminum Bronze Rod, Bar, and Shapes*， 2024-04-20 Update
- ASTM B161 Standard Specification for Nickel Seamless Pipe and Tube
- ASTM B164 Standard Specification for Nickel-Copper Alloy Rod, Bar, and Wire
- ASTM B166 Standard Specification for Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-Molybdenum-Cop
- ASTM E1025 Standard Practice for Design, Manufacture, and Material Grouping Classification of Hole-Type Image Quality Indicators (IQI) Used for Radiology
- ASTM E1255 Standard Practice for Radioscopy
- ASTM E1316 Standard Terminology for Nondestructive Examinations
- ASTM E1411 Standard Practice for Qualification of Radioscopic Systems
- ASTM E1734 Standard Practice for Radioscopic Examination of Castings
- ASTM E1742 Standard Practice for Radiographic Examination
- ASTM E2002 Standard Practice for Determining Total Image Unsharpness in Radiology
- ASTM E2445 Standard Practice for Qualification and Long-Term Stability of Computed Radiology Systems
- ASTM E747 Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology
ASTM E1647-16 history
- 2022 ASTM E1647-16(2022) Standard Practice for Determining Contrast Sensitivity in Radiology
- 2016 ASTM E1647-16 Standard Practice for Determining Contrast Sensitivity in Radiology
- 2009 ASTM E1647-09 Standard Practice for Determining Contrast Sensitivity in Radioscopy
- 2003 ASTM E1647-03 Standard Practice for Determining Contrast Sensitivity in Radioscopy
- 1998 ASTM E1647-98a Standard Practice for Determining Contrast Sensitivity in Radioscopy
