Standard Test Method for Measurement of Focal Spots of Industrial X-Ray Tubes by Pinhole Imaging

SIGNIFICANCE AND USE
5.1 One of the factors affecting the quality of radiologic images is the geometric unsharpness. The degree of geometric unsharpness is dependent on the focal spot size of the radiation source, the distance between the source and the object to be radiographed, and the distance between the object to be radiographed and the detector (imaging plate, Digital Detector Array (DDA) or film). This test method allows the user to determine the effective focal size of the X-ray source. This result may then be used to establish source to object and object to detector distances appropriate for maintaining the desired degree of geometric unsharpness or maximum magnification for a given radiographic imaging application, or both. Some ASTM standards require this value for calculation of a required magnification, for example, Practices E1255, E2033, and E2698.
SCOPE
1.1 The image quality and the resolution of X-ray images are especially sensitive to the characteristics of the focal spot. The imaging qualities of the focal spot are based on its two dimensional intensity distribution as seen from the detector plane.  
1.2 This test method provides instructions for determining the effective size (dimensions) of standard and mini focal spots of industrial X-ray tubes for focal spot dimensions from 100 μm up to several mm of X-ray sources up to 600 kV tube voltage. Smaller focal spots down to 50 µm could be evaluated with less precision. This determination is based on the measurement of an image of a focal spot that has been radiographically recorded with a “pinhole” technique. An alternative method with a plaque hole IQI may be found in the Annex A, which covers the same focal spot sizes.  
1.3 Smaller focal spots should be measured using Test Method E2903 using the projection of an edge.  
1.4 This test method may also be used to determine the change in focal spot size that may have occurred due to tube age, tube overloading, and the like. This would entail the production of a focal spot radiograph (with the pinhole method) and an evaluation of the resultant image for pitting, cracking, and the like.  
1.5 Units—Values stated in SI units are to be regarded as the 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.

General Information

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Publication Date
30-Nov-2020
Current Stage
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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.
Designation: E1165 − 20
Standard Test Method for
Measurement of Focal Spots of Industrial X-Ray Tubes by
1
Pinhole Imaging
This standard is issued under the fixed designation E1165; 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 Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 The image quality and the resolution of X-ray images
Barriers to Trade (TBT) Committee.
are especially sensitive to the characteristics of the focal spot.
The imaging qualities of the focal spot are based on its two
2. Referenced Documents
dimensional intensity distribution as seen from the detector
2
2.1 ASTM Standards:
plane.
E691Practice for Conducting an Interlaboratory Study to
1.2 This test method provides instructions for determining
Determine the Precision of a Test Method
theeffectivesize(dimensions)ofstandardandminifocalspots
E999Guide for Controlling the Quality of Industrial Radio-
of industrial X-ray tubes for focal spot dimensions from
graphic Film Processing
100µm up to several mm of X-ray sources up to 600kV tube
E1000Guide for Radioscopy
voltage.Smallerfocalspotsdownto50µmcouldbeevaluated
E1025 Practice for Design, Manufacture, and Material
with less precision. This determination is based on the mea-
Grouping Classification of Hole-Type Image Quality In-
surementofanimageofafocalspotthathasbeenradiographi-
dicators (IQI) Used for Radiography
cally recorded with a “pinhole” technique. An alternative
E1255Practice for Radioscopy
method with a plaque hole IQI may be found in theAnnexA,
E1742Practice for Radiographic Examination
which covers the same focal spot sizes.
E1815Test Method for Classification of Film Systems for
1.3 Smaller focal spots should be measured using Test
Industrial Radiography
Method E2903 using the projection of an edge.
E2002Practice for Determining Total Image Unsharpness
and Basic Spatial Resolution in Radiography and Radios-
1.4 This test method may also be used to determine the
copy
change in focal spot size that may have occurred due to tube
E2033Practice for Radiographic Examination Using Com-
age, tube overloading, and the like. This would entail the
puted Radiography (Photostimulable Luminescence
production of a focal spot radiograph (with the pinhole
Method)
method) and an evaluation of the resultant image for pitting,
E2339Practice for Digital Imaging and Communication in
cracking, and the like.
Nondestructive Evaluation (DICONDE)
1.5 Units—ValuesstatedinSIunitsaretoberegardedasthe
E2698Practice for Radiographic Examination Using Digital
standard.
Detector Arrays
1.6 This standard does not purport to address all of the
E2736Guide for Digital Detector Array Radiography
safety concerns, if any, associated with its use. It is the
E2903Test Method for Measurement of the Effective Focal
responsibility of the user of this standard to establish appro-
Spot Size of Mini and Micro Focus X-ray Tubes
3
priate safety, health, and environmental practices and deter-
2.2 European Standards:
mine the applicability of regulatory limitations prior to use.
EN 12543-2Non-destructive testing—Characteristics of fo-
1.7 This international standard was developed in accor-
cal spots in industrial X-ray systems for use in non-
dance with internationally recognized principles on standard-
destructive testing—Part 2: Pinhole camera radiographic
ization established in the Decision on Principles for the
method
1 2
This test method is under the jurisdiction of ASTM Committee E07 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Nondestructive Testing and is the direct responsibility of Subcommittee E07.01 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Radiology (X and Gamma) Method. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2020. Published February 2021. Originally the ASTM website.
3
approved in 1987. Last previous edition approved in 2017 as E1165–12(2017). Available from European Committee for Standardization (CEN), Avenue
DOI: 10.1520/E1165-20. Marnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1165 − 20
EN 12543-5Non-destructive testing—Characteristics of fo- with geometr
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1165 − 12 (Reapproved 2017) E1165 − 20
Standard Test Method for
Measurement of Focal Spots of Industrial X-Ray Tubes by
1
Pinhole Imaging
This standard is issued under the fixed designation E1165; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 The image quality and the resolution of X-ray images highly depend on are especially sensitive to the characteristics of the
focal spot. The imaging qualities of the focal spot are based on its two dimensional intensity distribution as seen from the detector
plane.
1.2 This test method provides instructions for determining the effective size (dimensions) of standard and mini focal spots of
industrial x-ray tubes. X-ray tubes for focal spot dimensions from 100 μm up to several mm of X-ray sources up to 600 kV tube
voltage. Smaller focal spots down to 50 μm could be evaluated with less precision. This determination is based on the measurement
of an image of a focal spot that has been radiographically recorded with a “pinhole” technique. An alternative method with a plaque
hole IQI may be found in the Annex A, which covers the same focal spot sizes.
1.3 This standard specifies a method for the measurement of focal spot dimensions from 50 μm up to several mm of X-ray sources
up to 1000 kV tube voltage. Smaller focal spots should be measured using EN 12543-5Test Method E2903 using the projection
of an edge.
1.4 This test method may also be used to determine the presence or extent of change in focal spot damage or deterioration size
that may have occurred due to tube age, tube overloading, and the like. This would entail the production of a focal spot radiograph
(with the pinhole method) and an evaluation of the resultant image for pitting, cracking, and the like.
1.5 Units—Values stated in SI units are to be regarded as the 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.
2. Referenced Documents
2
2.1 ASTM Standards:
1
This test method is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.01 on Radiology
(X and Gamma) Method.
Current edition approved Nov. 1, 2017Dec. 1, 2020. Published December 2017February 2021. Originally approved in 1987. Last previous edition approved in 20122017
as E1165 – 12.E1165 – 12(2017). DOI: 10.1520/E1165-12R17.10.1520/E1165-20.
2
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 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1165 − 20
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E999 Guide for Controlling the Quality of Industrial Radiographic Film Processing
E1000 Guide for Radioscopy
E1025 Practice for Design, Manufacture, and Material Grouping Classification of Hole-Type Image Quality Indicators (IQI)
Used for Radiography
E1255 Practice for Radioscopy
E1742 Practice for Radiographic Examination
E1815 Test Method for Classification of Film Systems for Industrial Radiography
E2002 Practice for Determining Total Image Unsharpness and Basic Spatial Resolution in Radiography and Radioscopy
E2033 Practice for Radiographic Examination Using Computed Radiography (Photostimulable Luminescence Method)
E2339 Practice for Digital Imaging and Communication in Nondestructive Evaluation (DICONDE)
E2698 Practice for Radiographic Examination Using Digital Detector Arrays
E2736 Guide for Digital Detector Array Radiography
E2903 Test Me
...

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