• There are no items in your cart

ASTM E 1695 : 1995 : R2006 : EDT 1

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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

Hardcopy , PDF

Superseded date

08-14-2020

Language(s)

English

Published date

12-01-2006

CONTAINED IN VOL. 03.03, 2017 Gives instruction for determining the spatial resolution and contrast sensitivity in X-ray and g-ray computed tomography (CT) images.

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.

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.

Committee
E 07
DocumentType
Test Method
Pages
5
ProductNote
Reconfirmed EDT 1
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

ASTM E 1814 : 2014 Standard Practice for Computed Tomographic (CT) Examination of Castings

ASTM E 1441 : 2011 : REDLINE Standard Guide for Computed Tomography (CT) Imaging
ASTM E 1570 : 2011 : REDLINE PRACTICE FOR COMPUTED TOMOGRAPHIC (CT) EXAMINATION

View more information
US$75.00
Excluding Tax where applicable

Access your standards online with a subscription

Features

  • Simple online access to standards, technical information and regulations.

  • Critical updates of standards and customisable alerts and notifications.

  • Multi-user online standards collection: secure, flexible and cost effective.