Experimental micro-CT system for x-ray NDT

Abstract

This work describes the set-up of an experimental system for micro-tomography developed in the framework of a collaboration between the Physics Department of the University of Bologna (Italy) and the Geosphaera Research Center of Moscow (Russia). The main goal of this inspection system is to carry out high-resolution analysis in vitro of biomedical samples † as well as nondestructive testing (NDT) of industrial components.The detection system consists of a 30x15 mm 2 rectangular fiber-optic taper (ratio 2:1) optically coupled to a cooled 12-bits CCD camera (1024x512 pixels). On the entrance window of the taper is deposited a thin layer of Gd 2 O 2 S:Tb phosphor which provides the X-light conversion. The image readout is carried out by means of a commercial frame grabber installed on a personal computer and specific software is used for data acquisition and control of the tomographic process.The object under investigation is arranged on a 3-degrees micro-positioning system (x-y translation and rotation) and irradiated by an X-ray microfocus beam (up to 200 kVp). The sample can be positioned easily along the source-detector axis in order to obtain a large magnification of details of interest.The X-ray detector has been intensively tested in order to determine its performance in terms of MTF, NPS, and DQE. Moreover, preliminary tests have been carried out on several samples in order to evaluate the performance of the micro-CT system.

Registration of Micro-Computed Tomography and Histological Images of the Guinea Pig Cochlea to Construct an Ear Model Using an Iterative Closest Point Algorithm

“…The micro-computed tomography (CT) system for small animal imaging has been studied since the 1990s. 10,20,25,29 It can obtain high-resolution anatomical information and be combined with other modalities. 32,33 Micro-CT is a variation of CT and is used primarily for the imaging of bony structure.…”

A method for detecting unbond defects of absorbing coatings

“…Therefore, it is necessary to develop a nondestructive test (NDT) of absorbing coatings. At present, common methods of NDT include rays [3], ultrasonics [4], infrared thermography [5] and eddy currents [6]. Among these, infrared thermography has been widely used in NDT due to its advantages of safety, high accuracy and of being non-contact.…”

Over and beyond the Primate baubellum Surface: A “Jewel Bone” Shielded in Museums

“…Recently, its importance and potential have become increasingly evident even when applied to other areas, such as industry and Cultural Heritage [1]. A growing number of authors have reported the successful use of CT as an efficient and non-destructive tool for the study of, for example, archaeological findings and works of art [2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”