Computed tomography systems and their industrial applications

Martz, H.E.; Azevedo, S.G.; Brase, James M.; Waltjen, Kenneth E.; Schneberk, D.J.

doi:10.1016/0883-2889(90)90159-e

Cited by 37 publications

(13 citation statements)

References 5 publications

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“…Unlike medical or production-line applications, however, in the laboratory environment, we are willing to trade speed to get improved quantitative information, which is needed for material studies. Furthermore, we are developing multiple-detector scanners for production line applications [9,10]. …”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Computed Tomography Assessment of Reinforced Concrete

Martz

Schneberk

Roberson

et al. 1992

Nondestructive Testing and Evaluation

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Computed Tomography Assessment of Reinforced Concrete

Martz

Schneberk

Roberson

et al. 1992

Nondestructive Testing and Evaluation

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“…These detectors integrate the entire energy spectrum and theirCT reconstructed images cannotprovide quantitative material information as do the energy discriminating detector scanners. The virtue ofthese multi-element detectors scanners is that they are fast and provide high spatial resolution images) 1, [14][15][16] All of our scanners are designed for modular assembly so that improvements in any one component can be easily incorporated. Forexample, this has been advantageous in adapting our area-array detector scanners with the new scintillation glass on the market and new charge couple device (CCD) cameras.1' The scanners vary in their energy resolution (none to high-200 eV), energy range (6 keV to 9 MV), spatial resolution (50 pm to 50 cm), speed (a few seconds to several days) as well as data acquisition modes.…”

Section: Ct Technologymentioning

confidence: 99%

<title>Three-dimensional nonintrusive imaging of obscured objects by x-ray and gamma-ray computed tomography</title>

1993

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Members of the Nondestructive Evaluation Section at the Lawrence Livermore National Laboratory (LLNL) are implementing the advanced three-dimensional imaging technique of x-and gamma-ray computed tomography (CAT or CT) for industrial and scientific obscured object evaluation. This technique provides internal and external views of materials, components, and assemblies nonintrusively. Our work includes building ofCT scanners as well as datapreprocessing, image reconstruction, display and analysis algorithms. These capabilities have been applied to a variety of industrial and scientific NDE applications. We have used CT to study various objects with obscured features at our laboratory ranging in size from I mm3 to 1 m3. in these studies, CT has revealed flaws (e.g. cracks, voids, and inclusions), internal and external dimensional information, differences in elemental composition or material density, and other important material characteristics. CT has also been used to localize, identify, and quantify radioisotopes within canisters. As illustrative examples, we describe how CT was instrumental in the analysis of concrete specimens, Diesel engine thermocouple plugs, jet engine turbine blades, ballistic target materials, and radioactive waste canisters.

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“…Ith the increasing demand of non-destructive testing for dense and large objects, great efforts are made to improve the performance of high energy X or γ ray imaging system, like high energy X ray digital radiography (DR) system and computerized tomography (CT) system [1]. Among all the attempts, one is to develop a detector system that meets the need of a specific imaging system, such as, high sensitivity, small size, good uniformity, low cross-talk and so on [2].…”

Section: Introductionmentioning

confidence: 99%

The development and evaluation of solid-state detector arrays for high energy x-ray imaging

Li²,

Wang³

et al. 2003

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)

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Several detector modules which consist of linear CdWO 4 crystal arrays optically coupled to photodiode arrays were developed for a high energy X-ray NDT system. An electron linear accelerator (LINAC) which produces pulsive X rays with maximum energy of 9 MeV is used for X ray source. 16 channels were assembled in each module, with crystal size of 0.8 mm x 5 mm x 30 mm and pitch size of 1.3 mm. Lead spacers were placed between crystals to reduce the cross-talk. Based on M-C simulation, the detection efficiency of the detector can reach 70%, energy deposit rate 30%, while crosstalk can be reduced to 5%. After fabrication, we tested their performances under the radiation sources of 60 Co, 6 MeV LINAC and 9 MeV LINAC. The results show that the arrays satisfy the meet of the NDT system. 0-7803-8257

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Computed tomography systems and their industrial applications

Cited by 37 publications

References 5 publications

Computed Tomography Assessment of Reinforced Concrete

Computed Tomography Assessment of Reinforced Concrete

<title>Three-dimensional nonintrusive imaging of obscured objects by x-ray and gamma-ray computed tomography</title>

The development and evaluation of solid-state detector arrays for high energy x-ray imaging

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