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The accuracy of medical CAT-scan images for non-destructive density measurements in small volume elements within solid wood
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
1991 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 25, no 6, p. 425-432Article in journal (Refereed) Published
Abstract [en]

A comparison between identically sampled CAT-scan images of five wooden test pieces (Pinus sylvestris) showed that the CT-number in each pixel varied with a standard deviation of ±3.9-11.1 CT numbers. This inaccuracy in CT-numbers is called "noise". As long as the direction of rotation can be controlled the noise in CAT-scan images of wood can be assumed to be approx. ±4 CT-numbers in each pixel. A calculation showed the average CT-number must differ ±1 unit to distinguish average CT-numbers in 2 × 2 × 1.5 mm volumes within solid wood. It has previously been shown that a change of ±1 CT-number corresponds approx. to a change in density of ±1 kg/m3. On the other hand, there is a difference in X-ray absorption coefficients between wood and water. Thereby dry wood densities in corresponding volumes must differ approx. ±2 kg/m3 to significantly be distinguished. The corresponding figure is approx. ±6 kg/m3 for wet wood densities with moisture content levels ranging from 6-100%.

Place, publisher, year, edition, pages
1991. Vol. 25, no 6, p. 425-432
National Category
Other Mechanical Engineering
Research subject
Wood Technology
Identifiers
URN: urn:nbn:se:ltu:diva-2682DOI: 10.1007/BF00225235Scopus ID: 2-s2.0-0542391855Local ID: 0560e770-ac8b-11db-aeba-000ea68e967bOAI: oai:DiVA.org:ltu-2682DiVA, id: diva2:975535
Note
Godkänd; 1991; 20070125 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lindgren, Owe

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