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ASTM E1695-95(2001)

Historical Reaffirmation

Standard Test Method for Measurement of Computed Tomography (CT) System Performance

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1.1 This test method provides instruction for determining the spatial resolution and contrast sensitivity in X-ray and -ray computed tomography (CT) images. The determination is based on examination of the CT image of a uniform disk of material. The spatial resolution measurement is derived from an image analysis of the sharpness at the edge of the disk. The contrast sensitivity measurement is derived from an image analysis of the statistical noise at the center of the disk.

1.2 This test method is more quantitative and less susceptible to interpretation than alternative approaches because the required disk is easy to fabricate and the analysis is immune to cupping artifacts. This test method may not yield meaningful results if the disk image occupies less than a significant fraction of the field of view.

1.3 This test method may also be used to evaluate other performance parameters. Among those characteristics of a CT system that are detectable with this test method are: the mid-frequency enhancement of the reconstruction kernel, the presence (or absence) of detector crosstalk, the undersampling of views, and the clipping of unphysical (that is, negative) CT numbers (see Air Force Technical Report WL-TR-94-4021). It is highly likely that other characteristics as well can be detected with this test method.

1.4 The values stated in SI units are to be regarded as the standard. Inch-pound units are provided for information only.

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.


SDO ASTM: ASTM International
Document Number E1695
Publication Date Jan. 1, 2001
Language en - English
Page Count 4
Revision Level 95(2001)
Supercedes
Committee E07.01
Publish Date Document Id Type View
June 1, 2020 E1695-20E01 Revision
June 1, 2020 E1695-20 Revision
Jan. 1, 2001 E1695-95 Revision
June 1, 2013 E1695-95R13 Reaffirmation
Dec. 1, 2006 E1695-95R06E01 Reaffirmation
Jan. 1, 2001 E1695-95R01 Reaffirmation