ASTM E2002-98(2009)
(Practice)Standard Practice for Determining Total Image Unsharpness in Radiology
Standard Practice for Determining Total Image Unsharpness in Radiology
SIGNIFICANCE AND USE
The gauge is intended to provide a means for measuring total image unsharpness as independently as practicable from the imaging system contrast sensitivity limitations. Further description and details of the gauge are provided in EN-462-5:1994.
The gauge can be used in conjunction with a contrast sensitivity measuring gauge, as described in Practice E 1647.
SCOPE
1.1 This practice covers the design and basic use of a gauge used to determine the total image unsharpness of radiographs and radioscopic systems.
1.2 This practice is applicable to radiographic and radioscopic imaging systems utilizing X-ray and gamma ray radiation sources.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The gauge described can be used effectively with radiation energies up to 400 kv. When using energies in the megavolt range the results may not be completely satisfactory.
1.5 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.
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Standards Content (Sample)
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Designation: E2002 − 98(Reapproved 2009)
Standard Practice for
Determining Total Image Unsharpness in Radiology
This standard is issued under the fixed designation E2002; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Wire Type)—Determination of Total Image Unsharpness
Value
1.1 This practice covers the design and basic use of a gauge
used to determine the total image unsharpness of radiographs
3. Terminology
and radioscopic systems.
3.1 Definitions—Definitionsoftermsapplicabletothisprac-
1.2 This practice is applicable to radiographic and radio-
tice may be found in Terminology E1316.
scopic imaging systems utilizing X-ray and gamma ray radia-
4. Summary of Practice
tion sources.
1.3 The values stated in SI units are to be regarded as 4.1 When it is determined necessary to evaluate and mea-
sure the Total Image Unsharpness (Spatial Resolution) of an
standard. No other units of measurement are included in this
standard. imaging system separately and apart from contrast sensitivity
measurements,atoolorgaugeasdescribedinthispracticecan
1.4 The gauge described can be used effectively with
be used. Conventional IQIs described in Practices E747 and
radiation energies up to 400 kv. When using energies in the
E1025combinethecontrastsensitivityandresolutionmeasure-
megavolt range the results may not be completely satisfactory.
mentsintoanoverallfigureofmerit.Suchfiguresofmeritmay
1.5 This standard does not purport to address all of the
not be adequate to detect subtle changes in the imaging
safety concerns, if any, associated with its use. It is the
system’s performance. For example, in a high-contrast image,
responsibility of the user of this standard to establish appro-
spatial resolution can degrade with almost no noticeable effect
priate safety and health practices and determine the applica-
upon the overall image quality. Similarly, in an application in
bility of regulatory limitations prior to use.
which the imaging system provides a very sharp image,
contrast can fade with little noticeable effect upon the overall
2. Referenced Documents
image quality, as determined using conventional IQIs. These
2.1 ASTM Standards:
situations often develop and may go undetected until the
E747Practice for Design, Manufacture and Material Group-
systemperformancedeterioratesbelowacceptableimagequal-
ing Classification of Wire Image Quality Indicators (IQI)
ity limits.
Used for Radiology
5. Significance and Use
E1025 Practice for Design, Manufacture, and Material
Grouping Classification of Hole-Type Image Quality In-
5.1 Thegaugeisintendedtoprovideameansformeasuring
dicators (IQI) Used for Radiology
total image unsharpness as independently as practicable from
E1316Terminology for Nondestructive Examinations
the imaging system contrast sensitivity limitations. Further
E1647Practice for Determining Contrast Sensitivity in Ra-
description and details of the gauge are provided in EN-462-
diology
5:1994.
2.2 EN Standard:
5.2 The gauge can be used in conjunction with a contrast
EN-462-5:1994Nondestructive Testing—Image Quality of
sensitivity measuring gauge, as described in Practice E1647.
Radiographs—Part 5: Image Quality Indicators (Duplex
6. Gauge Construction
This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
6.1 ThegaugeshallbefabricatedinaccordancewithFig.1,
structive Testing and is the direct responsibility of Subcommittee E07.01 on
usingthetolerancesgiveninTable1.Thisgaugeisidenticalto
Radiology (X and Gamma) Method.
the gauge described in EN-462-5:1994 and if necessary,
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved
EN-462-5:1994 should be reviewed for additional detailed
in 1998. Last previous edition approved in 2003 as E2002-98 (2003). DOI:
10.1520/E2002-98R09.
information.
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 Available from British Standards Institute (BSI), 389 Chiswick High Rd.,
the ASTM website.
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