Marc Valero

Marc Valero

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43
Publications
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173
Citations

Publications

Publications (43)
Article
The ACCIRAD project, commissioned by the European Commission (EC) to develop guidelines for risk analysis of accidental and unintended exposures in external beam radiotherapy (EBRT), was completed in the year 2014. In 2015, the "General guidelines on risk management in external beam radiotherapy" were published as EC report Radiation Protection (RP...
Article
Purpose: To describe the current status of implementation of European directives for risk management in radiotherapy and to assess variability in risk management in the following areas: 1) in-country regulatory framework; 2) proactive risk assessment; (3) reactive analysis of events; and (4) reporting and learning systems. Material and methods:...
Article
Risk analysis is typically considered from two complementary points of view: predictive analysis performed prior, and retrospective analysis, which follows the internal reporting of adverse situations or malfunctions, both on the organizational and material or human aspects. The purpose of these additional analyzes is to ensure that planned or impl...
Article
Objectifs L’échelle AIEA-INES, destinée à faciliter la perception par les médias et le public de l’importance des incidents et accidents nucléaires, couvre également les événements de radioprotection concernant les travailleurs, ainsi que ceux liés au transport et à l’utilisation des sources radioactives quel que soit le domaine d’activité. Il est...
Poster
Full-text available
1. Objectifs du travail 2. Méthodes et moyens 3. Résultats, discussion 4. Synthèse et conclusion S. GARANDEL, M. VALERO, V. CAUDRELIER 1 spécialiste Facteurs Humaines et Organisationnels, 1 radiophysicien médical, 1 gestionnaire des risques 5. Résumé Evolutions technologiques en cours en radiothérapie : passage de la technique de radiothérapie conf...
Article
Full-text available
The French regulations concerning the involvement of medical physicists in medical imaging procedures are relatively vague. In May 2013, the ASN and the SFPM issued recommendations regarding Medical Physics Personnel for Medical Imaging: Requirements, Conditions of Involvement and Staffing Levels. In these recommendations, the various areas of acti...
Article
The analysis of events is crucial for accident prevention. In 2007, ASN set up a system for the notification of radiation protection events. The majority of them concern the exposure of patients undergoing therapeutic or diagnostic procedures and, to a lesser extent, occupational exposures and the management of radioactive effluents. The most signi...
Article
In 2011 the European Commission launched a tender to develop guidelines for risk analysis of accidental and unintended exposures in external beam radiotherapy. This tender was awarded to a consortium of 6 institutions, including the ESTRO, in late 2011. The project, denominated “ACCIRAD”, recently finished the data collection phase. Data were colle...
Conference Paper
Full-text available
The purpose of this communication is to present a preliminary study on the contribution of a human and organizational factors (HOF) approach to the risks management in radiotherapy. The human and organizational factors are considered as the set of components of a working situation which affects the human performance, and furthermore the system perf...
Article
Purpose: The objective of the study was to perform an EU-wide study on the implementation of the MED requirements aimed at the reduction of the probability and the magnitude of accidents in radiotherapy. Methods: The two-step questionnaire was carried out using internet-based facility (Lime survey, www.limesurvey.org) and was sent out to establi...
Poster
Full-text available
L’analyse présentée s’inscrit dans le contexte des évolutions technologiques en cours en radiothérapie. Cela concerne, notamment, le passage de la technique de radiothérapie conformationnelle 3D (RC3D), largement utilisée aujourd’hui, à des technologies innovantes telles que les techniques de radiothérapie avec modulation d’intensité (RCMI). La fin...
Article
Objectifs pédagogiques Donner aux participants les moyens de déterminer, par des méthodes simples, la dose délivrée au cours d’un examen radiologique (conventionnel ou numérique). Les cas suivants seront envisagés : Soit l’installation n’est équipée d’aucun dispositif indicateur de dose : on utilisera une méthode de calcul simplifiée pour évaluer l...
Article
Objectifs pédagogiques Donner aux participants les moyens de déterminer, par des méthodes simples, la dose délivrée au cours d’un examen radiologique (conventionnel ou numérique). Ceci leur permettra, d’une part, de répondre à une demande d’information croissante de la part des patients et, d’autre part, de se conformer à la réglementation. L’arrêt...
Article
Within the frame work of implementation of Directive 97/43, a French dosimetry campaign in diagnostic radiology was carried out, from April 2001 to February 2003, under supervision of a steering Committee, involving representatives of scientific and professional societies, of the Directorate-General for Nuclear Safety and Radiation Protection (DGSN...
Article
Objectifs pédagogiques Donner aux participants les moyens de déterminer, par des méthodes simples, la dose délivrée au cours d’un examen radiologique (conventionnel ou numérique). Les cas suivants seront envisagés: -soit l’installation n’est équipée d’aucun dispositif indicateur de dose : on utilisera une méthode de calcul simplifiée pour évaluer l...
Article
Between 1998 and 1999, 160 incidents with possible consequences in terms of external or internal exposure of workers or members of the public and with recorded estimation and/or measure of exposure were reported to the former French public radiation protection institute "Office de protection contre les rayonnements ionisants". This study describes...
Article
The objective of this study was to compare the radiation exposure delivered by helical CT and pulmonary angiography (PA) for the detection of pulmonary embolism (PE), with an anthropomorphic phantom. A preliminary survey defined a representative standard procedure for helical CT and PA ( n=148) by choosing the exposure settings most frequently used...
Article
Full-text available
The study of naturally-occurring radiation and its associated risk is one of the preoccupations of bodies responsible for radiation protection. Cosmic particle flux is significantly higher on board aircraft that at ground level. Furthermore, its intensity depends on solar activity and eruptions. Due to their professional activity, flight crews and...
Article
Full-text available
Le concept de niveau de référence diagnostique (NRD) introduit dans la ClPR 73 < Protection et sûreté radiologique en médecine n est spécifique aux expositions médicales. Dans ce domaine, en effet, l'un des trois principes de la radioprotection, la limitation réglementaire des doses, ne peut s'appliquer comme pour les expositions professionnelles e...
Article
ICRP publication 73 (Radiological Protection and Safety in Medicine) introduced the concept of "diagnostic reference levels" (DRL), for medical exposures specifically. Because dose limits should not be applied for diagnostic or therapeutic irradiation, the approach to radiological protection is slightly different from that in occupational or public...
Article
Operational dosimetry has been established as a regulatory mean for the protection of workers exposed to ionizing radiations in France (Decree 98-1186 of 24 décembre 1998). It concerns all workers entering into a controled zone which characteristics are analyzed in details. The implementation of operational dosimetry implies the choice of an electo...
Article
The information system on the surveillance of exposures to ionizing radiations (SISERI) is the fundamental tool of management of the surveillance of workers exposed to ionizing radiations. It has been progressively develpped by OPRI to respond and to adapt at all times to the French regulations, from simple archiving to dynamic management of doses....
Article
To determine the fetal and maternal exposure to radiation by use of thermoluminescent dosimeters in order to compare conventional and CT-scan X-ray. Materials and methods. Dosimetry was performed with an anthropomorph phantom. Thermoluminescent dosimeters were positioned on the surface and in the depth of the phantom. Digital radiography of the pel...
Article
Study of the dose absorbed by the fetus during CT pelvimetry. Twenty consecutive pelvimetries on pregnant women showed the mean fetal location in regard of the maternal pelvic skeleton (retrospective study). Then, thermoluminescent radiation detectors were put in the antropomorph phantom slices, in housing correspondent to the fetal's volume. The l...
Article
The purpose of this document is to provide radiologists with a simple, but realistic means of determining the individual dose delivered to a patient during a radiological examination both in the region under investigation and at any other particularly sensitive organs. Fourteen types of examinations were considered corresponding to those most frequ...
Article
The characteristics of swept electron beams produced by Sagittaire or Saturne type accelerators were investigated by film dosimetry. Beam sections perpendicular to the beam limiting system (BLS) axis are fully described by Gaussian curves close to the centre of the field defined by the BLS, but they become more and more distorted as the elementary...
Article
Boag's theory is applied to thimble and plane parallel ionisation chambers using previously determined swept area dimensions and electron beam characteristics. The results obtained were compared with those obtained by measurements performed with lithium borate discs, by application of the 'equivalent dose per pulse' empirical method and the 'two vo...
Article
We have undertaken a computer study that explores the conditions under which seed ribbons may replace iridium 192 wires in the Paris System. Compared with continuous iridium 192 wires, seed ribbons demonstrate greater inhomogeneity and loss of flexibility, simplicity, and other advantages. Nonetheless, we have defined the conditions where seed ribb...

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Archived project