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ASTM E 1695 Document Information:
Title
Standard Test Method for Measurement of Computed Tomography (CT) System Performance
ASTM International
Publication Date:
Mar 15, 1995
Scope:
This test method provides instruction for determining the
spatial resolution and contrast sensitivity in X-ray and
y-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.
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.
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-94-40212). It is highly likely that other
characteristics as well can be detected with this test method.
The values stated in SI units are to be regarded as the
standard. Inch-pound units are provided for information only.
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.
2 X-Ray Computed Tomography Standards
(WL-TR-94-4021). Bossi, R. H. and Nelson, J. M. Air Force Contract
No. F33615-88-C-5404. Source document available from Air Force
Research Laboratory, AFRL/MLLP Building 655, 2230 Tenth Street,
Suite 1, Wright-Patterson AFB, OH 45433–7814.
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