Project, construction and test of a mini computerized tomograph

Abstract

Computed Tomography (CT) refers to the cross-sectional imaging of an object from both transmission or reflection data collected by illuminating the object from many different directions. CT is an imaging technique that has revolutionized the field of medical diagnostics. There are many others applications for CT images, such as, nondestructive evaluation of industrial products and analysis of biological specimens. A mini computerized tomograph was projected, constructed and tested. It operates with a gamma ray source of 241 Am (photons of 60 keV and 100 mCi of intensity) and a NaI(Tl) solid state detector. The system features translation and rotation scanning modes, a 100 mm effective field of view, and 1 mm spatial resolution. The preliminary results indicated a resolution between 5 % to 7 % to detect mass attenuation coefficient variations. The total cost of the Mini Computerized Tomograph of UNISO (MTCU) was about US$ 20.000,00.

Analysis of concrete material through gamma ray computerized tomography

“…The gamma ray CT miniscanner employed in this experiment [18], is a first-generation system with a fixed sourcedetector set up in which samples of concrete are translated and rotated. The data acquisition system and the movement of translation and rotation of sample are controlled by a PC.…”

Caracterizacao De Materiais Usando Dados De Tomografia Computadorizada Por Transmissao De Raios Gama

“…O Mini Tomógrafo Computadorizado de Raios-Gama, empregado no experimento (MTCU) (OLIVEIRA JR., 2003), foi construído e instalado no Laboratório de Física Nuclear Aplicada, da Universidade de Sorocaba (LAFINAU); e como importante ferramenta de ensaios não destrutivos, permite visualizar o interior de objetos opacos. O MTCU é um tomógrafo de primeira geração, operando com um único detector, podendo, cada imagem tomográfi ca obtida após a amostra, realizar uma serie de movimentos de translação e de rotação, na frente do feixe radioativo.…”

Construction and Test of Low Cost X-Ray Tomography Scanner for Physical-Chemical Analysis and Nondestructive Inspections

“…CT methods have been used in many areas in recent years such as: application in soil science [2], study of porous structure of amorphous materials [3], etc. Since the presentation of the medical tomography, a great number of scanners have been projected and constructed [4,5]. Our project has some similarity from that proposed by Naime [6], since we use the same kind of radiation detection.…”