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Differentiation of decayed and healthy tissue in fresh Michigan chestnuts using X-ray computed tomography (CT) imaging

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008878.(doi:10.13031/2013.29746)
Authors:   Irwin R Donis-González, Daniel E Guyer, Anthony Pease, Dennis W Fulbright
Keywords:   CT number, quality, nondestructive, attenuation coefficient, Chestnuts

In Michigan where chestnut (Castanea spp.) cultivation is a pioneering industry, mold and physiological kernel decay, commonly referred to as internal disorders, are responsible for significant economic and quality losses. A floating technique using differences in specific gravity is currently used by growers for the non-destructive separation of decayed and healthy chestnuts; however it is not a reliable procedure. Thus, there is a need to develop an accurate nondestructive technique that is able to assess internal chestnut disorders. Computed tomography (CT) was used to obtain transversal two-dimensional (2D) images from the interior region of decayed and healthy fresh chestnuts, from the hybrid cultivar Colossal and Chinese seedlings. Attenuation coefficients, referred to as Hounsfield-units (HU) or CT numbers, were acquired from air, decayed, and healthy tissue, as well as from various imperfections such as pellicle invagination and void spaces from different 2D-images. Results suggest that HU-measurements of fresh intact nuts can be used as a nondestructive indicator of the internal quality of chestnuts.

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