A simulação como método de ensino de habilidades no curso de medicina: relato de uma experiência com punção lombar

The teaching of the lumbar puncture (LP) technique with simulator is not well systematized in the curricula of medical schools. Studies show that training in the simulator provides learning technical skills, acquisition and retention of knowledge, improve self-confidence of the learner and enables the transfer to clinical practice. We intend this study to introduce simulated training in LP in medical course at the Universidade Federal do Rio Grande do Norte evaluating the experience taking into account quantitative aspects (performance on standardized tests) and qualitative (perception of the students regarding the method and the teaching process learning). The study was conducted in two phases. In the first phase practical training in PL was introduced in the 3rd year of medical school. Seventy-seven students were trained in small groups, guided by a checklist developed in the model Objective Structured Assessment of Technical Skill (OSATS), at this moment they knew they were not under performance evaluation. They were also asked whether they had prior chances to make an LP in patients. At the end of the first phase the students evaluated training in the following areas: teaching technique, simulator realism, time available per group, number of participants per group and relevance to medical practice. In the second phase, two years later, 18 students trained in first stage performed a new LP on the mannequin simulator, and its performance was evaluated through the same checklist of training in order to verify the technical retention. In addition, they answered a multiple choice test about practical aspects of the LP technique. Each participant received individual feedback on their performance at the end of their participation in the study. In the first phase of the study we found that only 4% of students had performed a lumbar puncture in patients until the 3rd year. The training of LP technique with simulator mannequin was considered relevant and the teaching methods was thoroughly evaluated. In the second phase, all participants were successful in implementing the lumbar puncture on the mannequin simulator, compliance with the most steps in a reasonable time, suggesting that would be able to perform the procedure in a patient.

Estratégia de capacitação pedagógica do residente: uma perspectiva para melhoria do ensino na Universidade Federal do Rio Grande do Norte

Studies have shown that resident informally plays the role of teacher. It is estimated that up to 25% of the residents of the time is devoted to teaching, mainly contributing as a facilitator, however, almost the entire medical residency programs in Brazil did not offer teacher training during residency education. This paper aims to introduce educational content initiation to teaching as part of the training of resident physician inserted in residency program of the University Hospital Onofre Lopes (HUOL). It is an exploratory, descriptive and prospective study in HUOL the Federal University of Rio Grande do Norte. Three steps were developed: preparation and planning of a pedagogic course, associated with a motivating technical content (basic and advanced life support); second stage, testing of pedagogical model for medical students; and finally, replication to residents. The interventions were made two practice stations life support with performance evaluation in practical activity through OSPE (Objective Structured Practical Examination). The techniques presented teachings were one-minute preceptor and feedback. Data collection was conducted through a structured evaluation form during the life support stations and at the end of the course, and analyzed using descriptive statistics. The results showed that the feedback and one minute preceptor were considered important for teaching and learning for more than 85% of participants. The feedback from evaluators practices stations added information about the performance and were held appreciatively way, according to 100% of the participants. Positive aspects highlighted by the participants were related to educational content, especially the participants of the first intervention. The time of the lectures of motivating technical content was the most repeated negative. Based on the good acceptance of pedagogical contents, this pioneer teacher training strategy was included in the formal residency program in Cardiology of our institution. It is considered therefore that the educational training model with motivating technical content was feasible and had a good evaluation and acceptance by most participants in both interventions. Thus, we believe that the educational content can be inserted in the formal curriculum of medical residency of other programs at HUOL through the training model developed in this study.

Estratégia de capacitação pedagógica do residente: uma perspectiva para melhoria do ensino na Universidade Federal do Rio Grande do Norte

Studies have shown that resident informally plays the role of teacher. It is estimated that up to 25% of the residents of the time is devoted to teaching, mainly contributing as a facilitator, however, almost the entire medical residency programs in Brazil did not offer teacher training during residency education. This paper aims to introduce educational content initiation to teaching as part of the training of resident physician inserted in residency program of the University Hospital Onofre Lopes (HUOL). It is an exploratory, descriptive and prospective study in HUOL the Federal University of Rio Grande do Norte. Three steps were developed: preparation and planning of a pedagogic course, associated with a motivating technical content (basic and advanced life support); second stage, testing of pedagogical model for medical students; and finally, replication to residents. The interventions were made two practice stations life support with performance evaluation in practical activity through OSPE (Objective Structured Practical Examination). The techniques presented teachings were one-minute preceptor and feedback. Data collection was conducted through a structured evaluation form during the life support stations and at the end of the course, and analyzed using descriptive statistics. The results showed that the feedback and one minute preceptor were considered important for teaching and learning for more than 85% of participants. The feedback from evaluators practices stations added information about the performance and were held appreciatively way, according to 100% of the participants. Positive aspects highlighted by the participants were related to educational content, especially the participants of the first intervention. The time of the lectures of motivating technical content was the most repeated negative. Based on the good acceptance of pedagogical contents, this pioneer teacher training strategy was included in the formal residency program in Cardiology of our institution. It is considered therefore that the educational training model with motivating technical content was feasible and had a good evaluation and acceptance by most participants in both interventions. Thus, we believe that the educational content can be inserted in the formal curriculum of medical residency of other programs at HUOL through the training model developed in this study.

Proposta de um sistema de avaliação de desempenho para o Restaurante Universitário da UFRN

The aim of this study was to propose a Performance Evaluation System for outsourced employees of the University Restaurant of the Federal University of Rio Grande do Norte to supply the lack of evaluative instruments. According to Provision of Services Contract nº050/2010 and nº055/2011 of FURN with SAFE LOCAÇÃO DE MÃO DE OBRA LTDA ME, it is the hired company to promote periodic functional performance evaluation of the outsourced employees, but this is not done. The performance evaluation process serves to evaluate if the employees are making their tasks according to the organizations’ objectives and goals, besides that helps to find service failures and capacity of employees demands, thus contributing to improve work conditions and the global performance of the organizations. To elaborate the proposal of evaluation, it was chosen an action research with the participation of all stakeholders, employees and managers from UR. On data collect, first, outsourced employees and management servers were interviewed, in order to raise existing perceptions about performance evaluation aspects. From these data and the work routine observation, a proposal of performance evaluation was elaborated, that was appreciated, criticized and adjusted by the actors involved (employees and managers) to the final formulation of the instrument. This study also presents the necessary steps to the implementation of the Performance Evaluation System. The proposed Performance Evaluation System can be applied to the FURN assuming this process, after modification of contract terms and the approval by the ADCON. It also can serve as an example to others units that works with the provision of outsourced services, enabling so the performance evaluation to be part of the management policy of all people working in FURN.

O comportamento eleitoral da nova classe trabalhadora no Rio Grande do Norte 2014: ideologia, avaliação de governo e voto

This thesis investigates the voting behavior of the fractions of the new working class in Rio Grande do Norte, more specifically in the cities of Natal, Mossoró and Caicó, from the presidential election of 2014. This research examined the ideology, the evaluation of government and guidance the vote of a portion of the working classes of RN voters. In Brazil, from 2003, socio-economic change has occurred perceptibly, especially in a part of the working classes who ascended socially and switched to the "C economic class." Thus, there was this period, a significant expansion of this social stratum. The expansion of the "class C" in the past decade in Brazil raised the academic debate and in the media about the emergence of a "new middle class". Neri (2008) termed the "class C" of the "new middle class" and that will be the central part of their studies. But the debate on the "new middle class" can not be simplistic to the point of considering that social mobility, the main variable income, entered this segment of the population in the middle class, because it has different specificities of the popular classes. To understand this phenomenon, the income variable was outdated, adding the importance of ownership of the means of production, control of labor power and the symbolic values in the division of social classes resulting in three fractions of the new working class: the management positions, non-heads and small fighters. In this study, using as a complement to the sociological approach (ideologies and social classes) and the performance evaluation was identified that the new working class (heads) mainly reproduced the ideological and political positioning of the middle class, resulting in the rejection of PT governments (2003-2014) and it’s social, compensatory and redistributive policies. From what has been seen, the new working class (chiefs) approaches the ideological and political behavior of the middle class that will reflect in their electoral choices and class interests. The new working class (not heads and small fighters who voted in the situation) because of its classist and ideological interests approached the Workers' Party positively evaluating the Lula-Dilma governments (2003-2014) due to the implementation of compensatory policies, and redistributive programs government turned to the popular classes. In a counterpoint, the voters of the new working class (not heads and small fighters) who voted null, reproduced the discourse of mainstream media and the middle class about the rejection of compensatory policies, redistribution and government programs of Lula-Dilma governments, and consequently they disapproved of the government Dilma and her candidacy.

Asymmetric 3D video coding based on regions of perceptual relevance

This dissertation presents a study and experimental research on asymmetric coding of stereoscopic video. A review on 3D technologies, video formats and coding is rst presented and then particular emphasis is given to asymmetric coding of 3D content and performance evaluation methods, based on subjective measures, of methods using asymmetric coding. The research objective was de ned to be an extension of the current concept of asymmetric coding for stereo video. To achieve this objective the rst step consists in de ning regions in the spatial dimension of auxiliary view with di erent perceptual relevance within the stereo pair, which are identi ed by a binary mask. Then these regions are encoded with better quality (lower quantisation) for the most relevant ones and worse quality (higher quantisation) for the those with lower perceptual relevance. The actual estimation of the relevance of a given region is based on a measure of disparity according to the absolute di erence between views. To allow encoding of a stereo sequence using this method, a reference H.264/MVC encoder (JM) has been modi ed to allow additional con guration parameters and inputs. The nal encoder is still standard compliant. In order to show the viability of the method subjective assessment tests were performed over a wide range of objective qualities of the auxiliary view. The results of these tests allow us to prove 3 main goals. First, it is shown that the proposed method can be more e cient than traditional asymmetric coding when encoding stereo video at higher qualities/rates. The method can also be used to extend the threshold at which uniform asymmetric coding methods start to have an impact on the subjective quality perceived by the observers. Finally the issue of eye dominance is addressed. Results from stereo still images displayed over a short period of time showed it has little or no impact on the proposed method.

Parallel Problem Solving from Nature – PPSN XIV:14th International Conference, Edinburgh, UK, September 17-21, 2016, Proceedings

This book constitutes the refereed proceedings of the 14th International Conference on Parallel Problem Solving from Nature, PPSN 2016, held in Edinburgh, UK, in September 2016. The total of 93 revised full papers were carefully reviewed and selected from 224 submissions. The meeting began with four workshops which offered an ideal opportunity to explore specific topics in intelligent transportation Workshop, landscape-aware heuristic search, natural computing in scheduling and timetabling, and advances in multi-modal optimization. PPSN XIV also included sixteen free tutorials to give us all the opportunity to learn about new aspects: gray box optimization in theory; theory of evolutionary computation; graph-based and cartesian genetic programming; theory of parallel evolutionary algorithms; promoting diversity in evolutionary optimization: why and how; evolutionary multi-objective optimization; intelligent systems for smart cities; advances on multi-modal optimization; evolutionary computation in cryptography; evolutionary robotics - a practical guide to experiment with real hardware; evolutionary algorithms and hyper-heuristics; a bridge between optimization over manifolds and evolutionary computation; implementing evolutionary algorithms in the cloud; the attainment function approach to performance evaluation in EMO; runtime analysis of evolutionary algorithms: basic introduction; meta-model assisted (evolutionary) optimization. The papers are organized in topical sections on adaption, self-adaption and parameter tuning; differential evolution and swarm intelligence; dynamic, uncertain and constrained environments; genetic programming; multi-objective, many-objective and multi-level optimization; parallel algorithms and hardware issues; real-word applications and modeling; theory; diversity and landscape analysis.

NON-FULL-TIME COLLEGE PROFESSORS: A NARRATIVE INQUIRY INTO THE NON-FULL-TIME FACULTY ROLE

The rate of non-full-time faculty members has increased rapidly over the last decade (Louis, 2009; MacKay, 2014; Meranze & Newfield, 2013), as the post-secondary landscape of fluctuating enrolment, fiscal and operational challenges, and the requirement to hire specialized skill sets have required institutions to rely heavily on this demographic. In the Ontario Colleges of Applied Arts and Technology (CAATs) system, institutions have tried to preserve and enhance educational quality with fewer resources through greater reliance on non-full-time faculty. The purpose of this study was to explore the perceptions and experiences of teaching and support of non-full-time faculty at one Eastern Ontario college. Employing a narrative inquiry methodology, data were collected from four participants through their writing three individual letters at the end of each month and participating in one interview at the end of the contract period. The data were analyzed and coded. This analysis revealed five themes: motivation, connection and engagement, compensation, teaching and development, and performance evaluation. Differences in the participants’ perceptions tended to reflect divergences across career stage: retired versus early career. The compensation package provided to non-full-time faculty was considered inadequate for those in the early career stage, especially comparing it to that of full-time faculty. In addition, the amount of previous teaching experience was an important indicator for the appropriate level of teaching resources and support provided by the institution. The newer faculty members required a higher level of support to combat feelings of role isolation. The temporary nature of the role made it difficult to establish a feeling of a strong connection to the institution and subsequently opportunities to engage further to deepen the relationship. Despite these differences across participants, autonomous motivators were consistent across all narratives, as participants expressed their desire to teach and share their knowledge to help students achieve their goals. Participants concluded their narratives by sharing future advice for faculty interested in pursuing the role. The narratives provided areas for improvement that would help increase the level of job satisfaction for non-full-time college faculty members: (a) establishing a more thorough performance evaluation process to align with institutional supports, (b) offering more diverse teaching resources to better prepare faculty and enhance teaching practices, (c) overhauling the compensation package to better recognize the amount of time and effort spent in the role and aligning with the compensation provided to full-time faculty, and (d) including rewards and incentives as part of the compensation package to enhance the level of commitment and availability for the role. These changes might well increase the job satisfaction and improve the retention of non-full-time faculty members.

Fast and robust face finding via local context

[EN]In visual surveillance face detection can be an important cue for initializing tracking algorithms. Recent work in psychophics hints at the importance of the local context of a face for robust detection, such as head contours and torso. This paper describes a detector that actively utilizes the idea of local context. The promise is to gain robustness that goes beyond the capabilities of traditional face detection making it particularly interesting for surveillance. The performance of the proposed detector in terms of accuracy and speed is evaluated on data sets from PETS 2000 and PETS 2003 and compared to the object-centered approach. Particular attention is paid to the role of available image resolution.

Espaço Mudança

O “Espaço de Mudança”, projecto gerido pela Santa Casa da Misericórdia do Concelho de Oliveira do Bairro, tem um Programa de Educação Parental (PEP) que funciona por encaminhamento e sinalização de entidades deste Concelho. Neste sentido, o PEP é construído de forma a responder às características e especificidades da população-alvo que atende, não se baseando em nenhum programa- -modelo. Por este motivo, o presente estudo constituiu-se num estudo de caso com o objectivo de avaliar se o PEP está a responder aos fins para os quais foi construído. Neste sentido, incorpora a caracterização e avaliação familiar de cada participante, a avaliação do seu desempenho no decorrer das sessões, a análise de mudanças significativas ao nível das variáveis adaptabilidade e coesão familiar, recursos familiares, coping familiar e suporte social, e também a análise de mudanças nas dificuldades e/ou nos problemas identificados na sinalização. Através deste estudo foi possível verificar que as mulheres participantes do PEP constituem um grupo com baixas qualificações, com percursos de pobreza, sendo beneficiárias da prestação de Rendimento Social de Inserção (RSI), e com problemáticas que se encadeiam e influenciam várias áreas das suas vidas. Contudo, constituem-se num grupo heterogéneo a nível de competências e necessidades. Tidas no seu conjunto, podemos concluir que 4 das 5 participantes tiveram um bom desempenho, concluindo-se que o PEP foi adequado para esta maioria Ao nível das variáveis adaptabilidade e coesão familiar, recursos familiares, coping familiar e suporte social não foram identificadas diferenças estatisticamente significativas ao longo do programa, porém é de realçar que, de forma global, as participantes melhoraram os seus resultados. É ainda possível verificar que o PEP teve um impacte positivo nas mesmas 4 formandas, as quais conseguiram ultrapassar algumas das dificuldades e/ou problemas que motivaram o encaminhamento. Foi possível concluir que o facto de se tratar de um grupo heterogéneo veio trazer ganhos para as participantes, contudo um dos elementos, que tinha uma problemática associada ao alcoolismo, deveria ter sido integrado num grupo com características diferentes, razão pela qual o PEP não se constituiu como uma resposta adequada para este elemento. O estudo revela ainda que o PEP no Espaço Mudança constitui uma mais-valia para colaborar na activação das competências pessoais, sociais e parentais das mães que passam por dificuldades acrescidas, sendo de promover e potenciar este tipo de intervenções construídas a partir das características e necessidades da população-alvo. /

Gestão de Recursos Humanos no Terceiro Setor: O Caso das Instituições Particulares de Solidariedade Social

O presente trabalho tem como objetivo geral estudar a gestão de recursos humanos (GRH) no terceiro setor, focando-se especificamente nas Instituições Particulares de Solidariedade Social (IPSS). Estas organizações têm vindo a demonstrar um papel cada vez mais relevante nas comunidades em que se inserem, pela sua missão em prestar serviços de cariz social e pela atual relevância como entidades empregadoras. A diversidade presente nas IPSS ao nível da estrutura, funcionamento, dimensão, organização e dinâmicas internas, proporciona o estudo e reflexão das especificidades na GRH. Para isso, abordam-se um conjunto de aspetos: i) diferenças entre meio empresarial e terceiro setor na GRH; ii) implicações da diversidade de respostas sociais e suas especificidades na gestão de pessoas; iii) o papel do Instituto de Segurança Social e as implicações legais na gestão de pessoas; iv) a localização geográfica e acesso a recursos humanos qualificados; v) a perspetiva das IPSS sobre os recursos humanos; vi) o perfil profissional dos colaboradores das IPSS; vii) práticas quotidianas na gestão de recursos humanos nas IPSS; viii) características da GRH nas IPSS (administrativa ou estratégica); ix) responsáveis pela GRH nas IPSS; x) o papel dos órgãos sociais na GRH; xi) profissionalização versus voluntariado; xii) a GRH, certificação e qualidade; xiii) as tendências do terceiro setor na gestão de pessoas. Foi utilizada uma metodologia qualitativa e aplicada a técnica de entrevista para recolher o conhecimento, experiências e perspetivas de diferentes interlocutores do terceiro setor, dirigentes, técnicos superiores, diretores de serviço, investigadores e representantes nacionais e distritais das IPSS. Da sistematização e análise dos dados recolhidos retiraram-se várias conclusões. As pessoas são consideradas o recurso mais importante para estas organizações, pela natureza social e humana das atividades desenvolvidas, prestadas por pessoas e destinadas a pessoas. Neste sentido, é demonstrada a importância do potencial humano aquando do recrutamento e seleção, pela primazia de requisitos como o relacionamento interpessoal em detrimento das qualificações. O perfil profissional característico das IPSS reconhece a importância da polivalência, disponibilidade, comprometimento, confiança, proximidade afetiva, voluntarismo e sentido de missão dos colaboradores, os quais tendem a ser são vistos como investimento tanto quanto reúnam estes aspetos; caso contrário podem ser encarados como custo. Quanto à acessibilidade a recursos humanos, surgem diferentes modalidades, consoante fatores de localização, dimensão, formação e estrutura organizacional, bem como o fenómeno da fuga de mão de obra, indício da dificuldade em captar e reter recursos humanos. O modelo de GRH nas IPSS é de cariz tradicional, caracterizado por uma gestão porimproviso com diferentes níveis de sensibilidade e capacidade das IPSS, no que concerne à implementação de processos de GRH, tais como sistemas de progressão na carreira, recrutamento interno e sistemas de avaliação de desempenho. Quanto aos aspetos da motivação e satisfação profissional, é assumida a importância da proximidade e apoio aos colaboradores, indicativos de um sistema de recompensas informal. É percetível a resistência na aplicação de técnicas de desenvolvimento organizacional, comprovada pela limitação na formação dos quadros de colaboradores. No entanto as IPSS são confrontadas com a rigidez dos instrumentos legais. A responsabilidade pela GRH é mais ou menos partilhada entre a direção técnica e os órgãos sociais, condicionada pelo estilo de liderança e relação de confiança entre si, em norma, pouco clara quanto aos papéis e funções desempenhadas. Por fim, é percebida a necessidade de coexistência de uma gestão profissionalizada e de direções voluntárias mais capacitadas e sensibilizadas para o desenvolvimento de metodologias e estratégias de gestão de pessoas, adaptadas às especificidades das IPSS. Este trabalho pretende contribuir com um espaço de reflexão para a elaboração de respostas mais eficazes e inovadoras que proporcionem o desenvolvimento organizacional, face às necessidades e transformações do terceiro setor. / This work main objective is the study of human resource management (HRM) in the third sector. It is focused specifically on Instituições Particulares de Solidariedade Social [Private Institutions for Social Solidarity] (IPSS). These kind of organizations have demonstrated an increased value in the communities they are inserted in, by providing social care services and by generating new jobs in the local communities. The study and reflection of HRM specificities is based on the variety in the structure, the purpose, the size, the internal organization and the dynamics of the different IPSS. For this purpose we explored the following aspects : i) the differences between business community and the third sector in HRM; ii) the implications of social responses diversity in people management; iii) the role of the National Insurance Institute and the legal impact on people management; iv) the geographic location and the IPSS access to skilled human resources; v) the understanding of IPSS on human resources; vi) the professional profile of IPSS employees; vii) the daily practices in human resource management on the IPSS; viii) the characteristics of HRM in IPSS (managerial or strategic); ix) who is responsible for HRM in IPSS; x) the role of executive board in HRM; xi) professionalization versus voluntary work; xii) HRM, quality and certification; xiii) the third sector trends in people management. The qualitative method and the interview technique were applied in order to gather knowledge, experiences and perspectives from several sources such as, different partners of the third sector, managers, service directors, technicians, researchers and national and local IPSS representatives. The results indicate several conclusions. Firstly the human resources are the most important resource of IPSS organizations due to the social nature of the services provided by them but also the importance of, the individual and social, skills required for these activities that are provided by people and are directed to people. This demonstrates the importance of interpersonal skills over professional qualifications during recruitment and selection. The IPSS recognize in their professionals the importance of versatility, availability, commitment, confidence, emotional proximity, voluntarism and sense of mission. If an employee fulfills these requirements, is considered an investment; otherwise might be seen as a cost. Regarding the accessibility of IPSS to qualified human resources, we consider different models, depending on location, size and training and organizational structure as well as the phenomenon run of hand labor, defined as the index of difficulty in capturing and retaining human resources. The model of HRM in IPSS is traditional in its nature and is characterized by management based on improvisation at different levels, regarding the implementation ofHRM processes such as career advancement systems, internal recruitment and performance evaluation. In regards to motivation and job satisfaction, it is valued the proximity and the support to the employees, showing therefore an informal system of rewards. There is a noticeable resistance to the application of organizational techniques which is demonstrated by controlling the formation of employees. However the IPSS are required to face the rigidity of legal instruments. The responsibility for HRM is shared between the technical direction and the management bodies, which depends on leadership style and mutual trust, and is generally unclear about the roles and duties performed. Finally, it becomes evident the need for coexistence between a professional management and a voluntary management, more capable and more sensible to the development of methods and strategies for people management, specifically adapted to each IPSS. This paper aims to contribute with space for reflection in the development of more effective and innovative responses for the organizational development, given the needs and transformations of the third sector.

Asset Management and Investment Banking

We find evidence that conflicts of interest are pervasive in the asset management business owned by investment banks. Using data from 1990 to 2008, we compare the alphas of mutual funds, hedge funds, and institutional funds operated by investment banks and non-bank conglomerates. We find that, while no difference exists in performance by fund type, being owned by an investment bank reduces alphas by 46 basis points per year in our baseline model. Making lead loans increases alphas, but the dispersion of fees across portfolios decreases alphas. The economic loss is $4.9 billion per year.

Random Access over Multi-Packet Reception Channels: A Mean-Field Approach

Thesis (Ph.D.)--University of Washington, 2016-06

Conception et caractérisation d'un dosimètre à fibre scintillante pour des applications en imagerie diagnostique et interventionnelle

Cette thèse a pour sujet le développement d’un détecteur à fibre scintillante plastique pour la dosimétrie des faisceaux de photons de basses énergies. L’objectif principal du projet consiste à concevoir et caractériser cet instrument en vue de mesurer la dose de radiation reçue au cours des examens d’imagerie diagnostique et interventionnelle. La première section est consacrée à la conception de six différents systèmes et à l’évaluation de leur performance lorsqu’ils sont exposés à des rayonnements de hautes et basses énergies. Tous les systèmes évalués présentaient un écart type relatif (RSD) de moins de 5 % lorsqu’ils étaient exposés à des débits de dose de plus de 3 mGy/s. Cette approche systématique a permis de déterminer que le tube photomultiplicateur répondait le mieux aux conditions d’exposition propres à la radiologie. Ce dernier présentait une RSD de moins de 1 % lorsque le débit de dose était inférieur à 0.10 mGy/s. L’étude des résultats permis également de suggérer quelques recommandations dans le choix d’un système en fonction de l’application recherchée. La seconde partie concerne l’application de ce détecteur à la radiologie interventionnelle en procédant à des mesures de dose à la surface d’un fantôme anthropomorphique. Ainsi, plusieurs situations cliniques ont été reproduites afin d’observer la précision et la fiabilité du détecteur. Ce dernier conserva une RSD inférieure à 2 % lorsque le débit de dose était supérieur à 3 mGy/min et d’environ 10 % au débit le plus faible (0.25 mGy/min). Les mesures sur fantôme montrèrent une différence de moins de 4 % entre les mesures du détecteur et celles d’une chambre d’ionisation lors du déplacement de la table ou du bras de l’appareil de fluoroscopie. Par ailleurs, cette différence est demeurée sous les 2 % lors des mesures de débit de dose en profondeur. Le dernier sujet de cette thèse porta sur les fondements physiques de la scintillation dans les scintillateurs plastiques. Les différents facteurs influençant l’émission lumineuse ont été analysés afin d’identifier leur contribution respective. Ainsi, la réponse du détecteur augmente de près d’un facteur 4 entre un faisceau de 20 kVp et 250 kVp. De ce signal, la contribution de la fluorescence produite dans la fibre claire était inférieure à 0.5 % lorsque les fibres étaient exposées sur 10 cm par des faisceaux de 20 à 250 kVp. Le phénomène d’extinction de la fluorescence par ionisation a également été étudié. Ainsi, l’atténuation du signal variait en fonction de l’énergie du faisceau et atteignit environ 20 % pour un faisceau de 20 kVp. En conclusion, cette étude suggère que les détecteurs à fibres scintillantes peuvent mesurer avec précision la dose de radiation reçue en imagerie diagnostique et interventionnelle, mais une calibration rigoureuse s’avère essentielle.