ASTM E1695 - 95(2013) - Standard Test Method for Measurement of Computed Tomography (CT) System Performance

ASTM E1695 - 95(2013)

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

Status : Current   Published : January 2013

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1.1 This test method provides instruction for determining the spatial resolution and contrast sensitivity in X-ray and γ-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 2). 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.




Standard NumberASTM E1695 - 95(2013)
TitleStandard Test Method for Measurement of Computed Tomography (CT) System Performance
StatusCurrent
Publication Date06 January 2013
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors Computed tomography, Contrast discrimination, Contrast sensitivity, CT, Geometrical unsharpness, Spatial resolution
ICS19.100
35.240.80
PublisherASTM
FormatA4
DeliveryYes
Pages5
File Size0 KB
Price£40.00


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