Tarcisio Passos Ribeiro de Campos

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This work analyzes SiO2 and SiO2-CaO glasses incorporated with samarium atoms produced by sol-gel synthesis. The goal is to provide biocompatible and biodegradable radioactive seeds as an alternative to be used in brachytherapy for the treatment of prostate cancer. The chemical and physical characteristics of the obtained glasses were analyzed by energy(More)
Ceramic seeds were synthesized by the sol-gel technique with Si:Sm:Ca and Si:Ho:Ca. One set of seeds was irradiated in the TRIGA type nuclear reactor IPR-R1 and submitted to instrumental neutron activation analysis (INAA), K(0) method, to determine mass percentage concentration of natural samarium and holmium in the seed as well as to determine all existing(More)
The present paper investigates the phenotypic parameters of stimulation markers and cell immunosuppression markers in an animal model using flow cytometry analysis. Six dogs were exposed to 2, 4 or 6 Gy following a head and neck protocol. Samples of peripheral blood mononuclear cells (PBMCs) were collected before irradiation, representing standard values(More)
Transforming Growth Factor-beta (TGF-beta) and Matrix metalloproteinases (MMPs) especially MMP-2 and MMP-9, secreted by a pool of cells from dermic-epidermic tissue, might be associated with a poor prognosis of cancer. We examined the effect of solar radiation on the secretion of TGF-beta, MMP-2 and MMP-9 by ex vivo PBMC and dermic-epidermic cell pool. The(More)
Objective: The present paper describes a procedure for conversion of computed tomography or magnetic resonance images into a three-dimensional voxel model for dosimetry purposes. Such model is a personalized representation of the patient that can be utilized in nuclear particle transport simulations by means of the MCNP (Monte Carlo N-Particle) code,(More)
This article investigates the dosimetry of a radioactive stent and radioactive liquid balloon placed into the heart vasculature to prevent restenosis after atherosclerosis treatment. The research aims to know the dosages to establish a suitable activity which achieves restenosis control and thereafter minimize radiation effects in the cardiac muscle. In(More)
This article presents a dosimetric investigation of boron neutron capture therapy (BNCT) combined with (252)Cf brachytherapy for brain tumour control. The study was conducted through computational simulation in MCNP5 code, using a precise and discrete voxel model of a human head, in which a hypothetical brain tumour was incorporated. A boron concentration(More)
Intensity Modulated Radiation Therapy (IMRT) is an advanced treatment technique, widely used in external radiotherapy. This paper presents the SOFT-RT which allows the simulation of an entire IMRT treatment protocol. The SOFT-RT performs a full three-dimensional renderization of a set of patient images, including the definitions of region of interest with(More)
The self-organizing adaptive map algorithm is adopted to learn all possible postures for an artificial arm of arbitrary configuration placed in a three-dimensional workspace. Arm postures are represented through their projections onto a set of image planes. Based on the link orientation and link length extracted from these images, a topological state space(More)