Encontrados 6 documentos, a visualizar página 1 de 1
Reconstrução tomográfica em SPECT: correcção da atenuação
Silvia De Francesco; Paulo J. S. G. FerreiraThis paper studies certain reconstruction algorithms which find application in computerized tomography. Special attention is devoted to SPECT and to the problem of attenuation and its correction. Several algorithms that have been proposed to perform attenuation correction are reviewed and compared. ; Neste artigo estudam-se certas classes de algoritmos de reconstrução que são especialmente...
Tomographic Techniques and Tomography Reconstruction Algorithms. The SPECT Case
Silvia De Francesco; Paulo Jorge S. G. FerreiraNowadays, different tomographic techniques are largely utilised in clinical practice, giving a precious contribution to diagnosis. From the clinical point of view, each of these techniques has a big potential, for instance to plan therapeutic strategies. (...)Keywords: tomography; tomographic techniques; tomographic reconstruction algorithms; spect; attenuation; attenuation correction algorithmsM.S.,...
Fourier methods in tomography, a review
Silvia de Francesco; Augusto SilvaFourier theory plays a central role in tomography and a special class of reconstruction methods, known as direct Fourier methods, belongs directly from this theory. Recently, related to the demand for 3D reconstruction, the interest for these methods has been growing due to their reduced computational complexity.In this paper we are going to review the application of Fourier theory to the field of tomograghy, b...
User Interface for a Dentist Office Management Tool
Silvia De Francesco; Carlos Loff Barreto; Beatriz Sousa Santos; José Alberto RafaelIn this paper the prototype of a user interface for a dentist office management tool is described. Accordingly to the rules of the human-computer software interface design, as a first step, the study of the needs and the profile of thepossible users was performed. Using the results of this study a prototype was developed, consisting basically on three tightly linked environments: the Agenda, the Patients’...
Reconstrução tomográfica em SPECT: aspectos gerais
Silvia De Francesco; Paulo J. S. G. FerreiraThis paper is the first of two works devoted to the study of certain reconstruction algorithms which find application in computerized tomography. In this first paper we will study general aspects and computational issues in reference to tomographic reconstruction. The follow up paper will be exclusively concerned with the problem of attenuation in SPECTand its correction. ; Este artigo é o primeiro...
State of the Art on X-Ray CT Reconstruction Methods
Silvia De Francesco; Augusto SilvaThe goal of this paper is to give a short overview to the complex field of x-ray CT reconstruction methods, focusing on the main classes of reconstruction methods and on some of the methods actually in use in modern x-ray CT systems. ; The goal of this paper is to give a short overview to the complex field of x-ray CT reconstruction methods, focusing on the main classes of reconstruction methods and on some of...
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