Inflammatory myofibroblastic tumor of the lung: a rare cause of atelectasis in children

Although rare, inflammatory myofibroblastic tumor is the most common primary lung mass in children. We report the case of an 11-year-old boy investigated for persistent cough and dyspnea with complete left lung atelectasis mimicking pneumonia. CT and MRI showed an endobronchial mass of the left main bronchus. The boy underwent endoscopic resection of the tumor and histology was in favor of an inflammatory myofibroblastic tumor of the lung. This diagnosis should be suspected in children with recurrent pneumonia. The prognosis is good after complete resectio

Acoustic radiation force impulse imaging—normal values of liver stiffness in healthy children

Background: Acoustic radiation force impulse imaging (ARFI) is a recent ultrasound technique to assess tissue stiffness. Objective: Our aim was to describe the feasibility and to define normal ARFI values in liver in children. Materials and methods: ARFI values were measured in 103 children (ages 2weeks to 17years) divided into four age groups, at a minimum depth of 3cm. In 20 children, measurements were done at 3-, 4- and 5-cm depth in the liver to assess the suitability of measurement location. The impact of age groups and of depth groups was examined using multilevel models. The precision of the measurements was determined using intraclass correlation coefficient (ICC). Results: There was no statistical difference between measurements taken at different ages, with a mean propagation velocity of 1.12m/s (range: 0.73 to 1.45m/s). There was no significant difference according to the depth of the regions of interest (up to 5cm). The ICC was 0.77 (95% CI 0.69-0.83). Conclusion: ARFI is feasible in children at any age with an acceptable reliability. The depth of measurements in the liver seems to have no influence on test results. We set the standard ARFI elastography values for healthy liver in childre

Integration of Multi-criteria Decision Analysis in the Evaluation Process of Interactive Adaptive Systems based on ISO/IEC 25040 Standard

During the evaluation process of Interactive Adaptive Systems (IAS), there are some tasks that require making decisions in favor of the appropriate solution(s) out of several decision options that can be available. Numerous influencing factors should be considered surrounding these tasks. The aim of this thesis consists in supporting decision-making during the evaluation process of interactive adaptive systems, based on the international standard ISO/IEC 25040. In this way, a multi-criteria decision analysis approach and a Web-based multi-criteria decision support system are proposed in order to support a decision aid for a range of different possible stakeholders involved in the evaluation process. Firstly, the priorities of evaluation (sub)attributes to be assessed are identified. Then, the appropriate evaluation method(s) for the layered evaluation and the evaluation as a whole are proposed. Finally, we have investigated the application of our proposal through a case study following this evaluation processLors du processus d'évaluation des Systèmes Interactifs Adaptatifs (SIA), il existe certaines tâches qui nécessitent d'effectuer un choix d'une ou plusieurs solutions appropriées. Divers facteurs peuvent influencer ces décisions. L'objectif de cette thèse consiste à aider différents intervenants impliqués dans le processus d'évaluation à prendre des décisions appropriées en se basant sur la norme ISO/IEC 25040. Dans ce cadre, nous proposons une approche d'aide à la décision multicritère, ainsi qu'un système d'aide à la décision multicritère basé sur le Web. D’abord, nous nous intéressons à l’identification des niveaux de priorité des (sous)attributs d'évaluation qui doivent être évalués dans les SIA. Par la suite, nous nous focalisons sur la sélection des méthodes appropriées pour l'évaluation structurée et l'évaluation traditionnelle. De plus, nous proposons un processus d'évaluation adapté aux SIA, basé sur la norme ISO/IEC 25040. Enfin, un système interactif adaptatif dans le domaine du transport est étudié afin de valider notre proposition en se basant sur ce processus d'évaluation

Corrélation pré et post natale de l'imagerie cérébrale en IRM

L'imagerie par résonance magnétique (IRM) fœtale n'a cessé de connaître des progrès durant les trente dernières années, notamment l'imagerie du cerveau fœtal. Bien que l'IRM cérébrale fœtale ait fait couler beaucoup d'encre, la performance de cette technique n'a jamais été évaluée sur de larges séries. La majorité des articles publiés sur ce sujet, ont comparé les résultats de l'IRM fœtale avec les données échographiques et neuropathologiques et rarement avec l'imagerie IRM post natale. Pourtant il semble important d'évaluer la performance de l'imagerie anténatale car elle joue un rôle dans l'établissement du pronostic, du risque de récurrence des malformations ainsi que dans les options de prise en charge des enfants à la naissance. Le but de notre étude a été d'évaluer la pertinence du diagnostic fait par l'IRM fœtale sur une large cohorte de fœtus, en comparant les images anténatales avec celles obtenues en postnatal. Nos résultats ont montré une excellente concordance dans 85 % des cas et un impact sur le pronostic dans seulement 9% des cas

Towards a Web-based Multi-Criteria Decision Support System for the Layered Evaluation of Interactive Adaptive Systems

IF=3.078International audienceThe choice of suitable evaluation methods for the layered evaluation of Interactive Adaptive Systems (IAS) needs the consideration of different factors, leading to a multi-criteria decision analysis problem. This paper proposes the first step toward a Web-based Multi-Criteria Decision Support System (MCDSS). Our proposal is based on a recent multi-criteria decision method called ELECTRE TRI-B-H (Elimination and Choice Translating Reality) to guide the layered evaluation of IAS. The goal is to support the choice of appropriate evaluation methods for individual layers taking into account constraints of the layered evaluation and the individual layers. The appropriateness of each evaluation method is analyzed for the layered evaluation in general and each layer in particular. The use of ELECTRE TRI-B-H method allows decomposing a decision problem into intermediate sub-problems through a hierarchy model and sorting alternative evaluation methods at different levels of the hierarchy. A case study of an adaptive hypermedia system is presented; in this study, the ELECTRE TRI-B-H method has been applied to select the most suitable evaluation methods for each of its layers taking into account the layered evaluation context. The promising results show the feasibility of the proposed approach, leading to various research perspective

EvalCHOICE: A Decision Support Approach for the Usability Evaluation of Interactive Adaptive Systems

International audienceSuccessful usability evaluation of interactive adaptive systems requires the use of appropriate methods. Different usability evaluation methods exist in the literature. These methods can be applied in association with the individual layers and with the whole adaptive system. In each situation, it is essential to apply the appropriate evaluation methods. In this paper, we propose a novel decision support approach called EvalCHOICE. It guides evaluators in the choice of appropriate usability evaluation methods for individual layers and the adaptive system as a whole. Our proposal is applied to determine the suitable evaluation methods for a given Web-based adaptive system in the field of transport

Modification of the alignment between the tibial tubercle and the trochlear groove induced by temporary hemiepiphysiodesis for lower extremity angular deformities: a trigonometric analysis

This study aimed to predict the modification of the alignment between the tibial tubercle (TT) and the trochlear groove (TG) that occurs during femoral or tibial hemiepiphysiodesis. MRI scans of 541 knees were retrospectively reviewed to determine the distances between the cranial insertion of the patellar tendon on the TT and the femoral physis (FP)/tibial physis (TP). Thereafter, we developed a trigonometric formula to calculate the predicted change of the TT-TG distance that occurs during hemiepiphysiodesis around the knee using both the planned angular correction as well as the length between the physis (both distal femoral and proximal tibial) and the insertion of the patellar tendon of the TT. This study showed that TT-FP and TT-TP distances vary very little with sex and age during growth and the mean values of FP-TT and TP-TT distances (55 and 7 mm, respectively) can thus be used in clinical settings for calculating a rough estimate of the translation of the TT position that will occur during 'guided growth'. On this subject, one can expect a 1 mm simultaneous lateral or medial transfer of the TT for every 1° of angular correction during distal femoral hemiepiphysiodesis. For proximal tibial hemiepiphysiodesis, an angular correction of 8° should roughly translate into a simultaneous 1 mm transfer of the TT. This study puts forward the hypothesis that a simultaneous modification of the TT-TG distance has to be expected following hemiepiphysiodesis, whether femoral or tibial