Detection of flaws in construction columns using 3D reconstruction and manipulation

A methodology is proposed for the analysis of construction columns to deter mine structural defects such as bubbles and different types of materials in concrete as well as the diameter of the steel rods. A filtered backproject ion algorithm was used to obtain a 2D density distribution assuming three d ifferent materials in the column (concrete, air and steel). An interpolatio n of this 2D distribution is used to obtain inter-planar voxels to construc t a 3D object. This computer object can be manipulated and new projections can be generated to analyze planes that cannot be directly measured. The in put data were generated by a computer simulation of the column characterist ics. (C) 2001 Published by Elsevier Science Inc.