Monte Carlo Simulation Used to Calculate Energy Correction Factor for Thermoluminescent Dosimeters Used by Occupational Workers on Pediatric Exams.

The main objective of this work is to simulate the X-ray scattered spectra by different pediatric phantoms (simulation of children subjected to barium meal procedures) to calculate an energy correction factor (ECF) to the reading of thermoluminescent dosimeters (TLDs). To perform this evaluation, the TLDs were positioned over three areas in two occupational workers: eyes, thyroid and hands. The Geant4 toolkit was used to define the spectra collected by TLDs, making possible to calculate the ECF.

EVALUATION OF THYROID RADIATION DOSE USING CONE BEAM COMPUTED TOMOGRAPHY.

Cone beam computed tomography (CBCT) became common in various dental specialties over the past decade. This technology is used by dental professionals regarding the investigation of maxillofacial structures. Due to the diagnostic quality and possibility of 3D view, this method has become an additional method of human exposure to ionizing radiation.

[Adrenal tumors: topical diagnosis and surgical outcomes].

A total of 128 adrenalectomies were made for catechol-producing tumor (n = 69), mineralocorticism (n = 27), primary and metastatic adrenal cancer (n = 20), other tumors (n = 12). A stable hypotensive result after adrenalectomy was observed in 97.1, 66.

Polynomial neural network for linear and non-linear model selection in quantitative-structure activity relationship studies on the internet.

This article presents a self-organising multilayered iterative algorithm that provides linear and non-linear polynomial regression models thus allowing the user to control the number and the power of the terms in the models. The accuracy of the algorithm is compared to the partial least squares (PLS) algorithm using fourteen data sets in quantitative-structure activity relationship studies. The calculated data show that the proposed method is able to select simple models characterized by a high prediction ability and thus provides a considerable interest in quantitative-structure activity relationship studies.

[The cartographic method in hygiene research].

Certain properties of the map as a model are briefly examined. Use of the cartographic model in hygiene largely depends on space characteristics of the events and processes being studied. Hygiene as a science introduces into the map new, specific contents and a methodology that includes analysis and evaluation of mapped processes and events from the viewpoint of their impact upon people's health.