Reconstructed image quality analysis of an industrial instant non-scanning tomography system with different types of collimators by the Monte Carlo Simulation

• Autor(a) principal: VELO, ALEXANDRE F.
• Data de Publicação: 2018
• Outros Autores: CARVALHO, DIEGO V., ALVAREZ, ALEXANDRE G., HAMADA, MARGARIDA M., MESQUITA, CARLOS H., INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
• Tipo de documento: Artigo de conferência
• Título da fonte: Repositório Institucional do IPEN
• Texto Completo: http://repositorio.ipen.br/handle/123456789/28309
• topic: collimators; computerized tomography; image processing; monte carlo method; quality assurance; quality management; shielding; signal-to-noise ratio; spatial resolution

The greatest impact of the tomography technology application currently occurs in medicine. The great success of medical tomography is due to the human body presents reasonably standardized dimensions with wellestablished chemical composition. Generally, these favorable conditions are not found in large industrial objects. In the industry there is much interest in using the information of the tomograph in order to know the interior of: (i) manufactured industrial objects or (ii) machines and their means of production. In these cases, the purpose of the tomograph is to: (a) control the quality of the final product and (b) optimize production, contributing to the pilot phase of the projects and analyzing the quality of the means of production. In different industrial processes, e. g. in chemical reactors and distillation columns, the phenomena related to multiphase processes are usually fast, requiring high temporal resolution of the computed tomography (CT) data acquisition. In this context, Instant non-scanning tomograph and fifth generation tomograph meets these requirements. An instant nonscanning tomography system is being developed at the IPEN/CNEN. In this work, in order to optimize the system, this tomograph comprised different collimators was simulated, with Monte Carlo method using the MCNP4C. The image quality was evaluated with Matlab?? 2013b, by analysis of the following parameters: contrast to noise (CNR), root mean square ratio (RMSE), signal to noise ratio (SNR) and the spatial resolution by the Modulation Transfer Function (MTF(f)), to analyze which collimator fits better to the instant nonscanning tomography. It was simulated three situations; (i) with no collimator; (ii) ?25 mm x 50 mm cylindrical collimator with a septum of ??5.0 mm x 50 mm; (iii) ??25mm x 50 mm cylindrical collimator with a slit septum of 24 mm x 5.0 mm x 50 mm.