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Description of ASTM-E1570 2005ASTM E1570-00-e1-Reapproved2005Historical Standard: Standard Practice for Computed Tomographic (CT) ExaminationASTM E1570Scope 1.1 This practice is for computed tomography (CT), which may be used to nondestructively disclose physical features or anomalies within a test object by providing radiological density and geometric measurements. This practice implicitly assumes the use of penetrating radiation, specifically X-ray and -ray. 1.2 CT systems utilize a set of transmission measurements made along paths through the test object from many different directions. Each of the transmission measurements is digitized and stored in a computer, where they are subsequently reconstructed by one of a variety of techniques. A treatment of CT principles is given in Guide E 1441. 1.3 CT is broadly applicable to any material or test object through which a beam of penetrating radiation passes. The principal advantage of CT is that it provides densitometric (that is, radiological density and geometry) images of thin cross sections through an object without the structural superposition in projection radiography. 1.4 This practice describes procedures for performing CT examinations. This practice is to address the general use of CT technology and thereby facilitate its use. 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. For specific safety statements, see Section , NBS Handbook 114, and Federal Standards 21 CFR 1020.40 and 29 CFR 1910.96. Keywords artifact; beam-hardening; computed tomography; contrast; contrast detail dose curves; contrast sensitivity; data storage; densitometric images; detection system; edge response function; field-of-view; gamma-ray; image analysis; image display; image reconstruction; line pairs/millimetre; line spread function; linear attenuation; manipulation system; modular transfer function; noise; pixel ; reconstruction diameter; reconstruction matrix; signal-to-noise; slice plane thickness; spatial resolution; system configuration; test object; test phantom; voxel; X-ray ICS Code ICS Number Code 35.240.80 (IT applications in health care technology) DOI: 10.1520/E1570-00R05E01 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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