Accession Number:

ADA326274

Title:

CT-Assisted Solid Freeform Fabrication.

Descriptive Note:

Quarterly status rept. no. 11, 1 Feb-30 Apr 97,

Corporate Author:

ADVANCED RESEARCH AND APPLICATIONS CORP SUNNYVALE CA

Personal Author(s):

• Stanley, James H.

Report Date:

1997-05-01

Pagination or Media Count:

15.0

Abstract:

Computed Tomography CT is a radiographic inspection method that uses a computer to reconstruct a cross sectional image of an object from a set of in line X-ray transmission measurements. CT was introduced in the early 1970s as a neurological examination technique and later extended to industrial applications by Advanced Research and Applications Corporation ARACOR and others. The original medical acronym, CAT, is still widely used and is likely to be familiar to the reader. The technology provides an ideal examination technique whenever the primary goal is to locate and size planar or volumetric detail in three dimensions. Because of the relatively good penetrability of X rays, as well as the sensitivity of absorption cross sections to the density and atomic number of matter, CT permits the nondestructive physical and, to a limited extent, chemical characterization of the internal nature of objects. And since the method is X-ray based, it applies equally well to metallic and non-metallic specimens, solid and fibrous materials, smooth and irregularly surfaced parts.

Descriptors:

• *X RAYS
• *ABSORPTION CROSS SECTIONS
• *COMPUTERIZED TOMOGRAPHY
• NONDESTRUCTIVE TESTING
• FABRICATION
• TRANSMITTANCE
• IMAGES
• NEUROLOGY
• ATOMIC PROPERTIES
• RADIOGRAPHY
• CASTINGS

Subject Categories:

• Manufacturing and Industrial Engineering and Control of Production Systems
• Nuclear Physics and Elementary Particle Physics
• Medicine and Medical Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE