1,860 research outputs found
The Importance of the Cardiac Cycle in the Imaging Criteria for Left Ventricular Noncompaction
Journals’ policies of storage and reuse of raw research data and their impact in five scientific areas
Analisys of journals' policies about storage and re-use of raw research data
Bibliometric profile of the global scientific research on multiple sclerosis (2003–2012)
Abstract
Background and objectives: The aim of this paper is to analyse the scientific research on multiple
sclerosis using a bibliographic analysis of articles published during the period 2003–2012.
Methods: The items under study were obtained from the Science Citation Index-Expanded (SCI-E)
database, which was accessed through the Web of Science (WOS) platform. All records with the term
‘multiple sclerosis’ in the title, plus all articles published in the journals Multiple Sclerosis and Multiple
Sclerosis Journal, were analysed.
Results: A total of 9778 articles, with 160,966 citations, were retrieved on multiple sclerosis, and the
majority of the articles were published in Multiple Sclerosis Journal (n = 1511). The articles were published
in journals belonging to 135 different subject areas, with the greatest number of papers falling
under the category of clinical neurology. The countries that published the largest numbers of articles
were the United States (US) (n = 2786), Italy (n = 1263), the United Kingdom (n = 1147) and Germany
(n = 1018). International collaborations produced 20.4% of the papers.
Conclusions: We emphasise the progressive growth of publications worldwide, the publication of articles
in a wide variety of journals covering numerous subject areas, and the research leadership of Western
countries, most notably European countries, the US and Canad
Social media in cardiology: Reasons to learn how to use it
Social media has changed the way we learn, educate, and interact with our peers. The dynamic nature of social media and their immediate availability through our portable devices (smartphones, tablets, smartwatches, etc.) is quickly transforming the way we participate in society. The scope of these digital tools is broad as they deal with many different aspects: Teaching and learning, case discussion, congresses coverage, peer to peer interaction, research are examples worth mentioning. The scientific societies considered more innovative, are promoting these tools between their members. These new concepts need to be known by the cardiologists to stay updated, as countless information is moving rapidly through these channels. We summarize the main reasons why learning how to use these tools to be part of the conversation is essential for the cardiologist in training or fully stablished
Home Blood Pressure Management Intervention in Low- to Middle-Income Countries: Protocol for a Mixed Methods Study.
BACKGROUND: Control of hypertension in low- and middle-income countries (LMICs) is poor, often less than 10%. A strong body of evidence demonstrates that home blood pressure management lowers blood pressure, and recent guidelines from the National Institute for Clinical Health and Excellence recommends home blood pressure monitoring. However, the preponderance of data on the benefits of home blood pressure management comes from studies in high-income countries. OBJECTIVE: The objective of the study is to examine whether an intervention of home blood pressure management is feasible in LMICs. Home blood pressure management is defined as self-monitoring of blood pressure and self-titration of antihypertensive medications. We will identify barriers and facilitators of home blood pressure management and explore unique contextual factors in LMICs that influence implementation of home blood pressure management. METHODS: Participants will be recruited from 6 sites from 2015 to 2018. Patients and health care workers will be included. We will use mixed methods including focus groups, interviews, and standardized checklists. When possible, we will adapt materials from prior successful studies so that they are culturally and contextually appropriate. RESULTS: This ongoing study is funded by the World Heart Federation. The information that is obtained will be used to develop a randomized clinical trial of home blood pressure management in LMICs. CONCLUSIONS: The data generated from this qualitative study will provide much needed information from patients and health care workers about barriers and facilitators of home blood pressure management and unique contextual factors that might influence implementation of home blood pressure management in LMICs
Composition of Constraint, Hypothesis and Error Models to improve interaction in Human-Machine Interfaces
We use Weighted Finite-State Transducers (WFSTs) to represent the different sources of information available: the initial hypotheses, the possible errors, the constraints imposed by the task (interaction language) and the user input. The fusion of these models to find the most probable output string can be performed efficiently by using carefully selected transducer operations. The proposed system initially suggests an output based on the set of hypotheses, possible errors and Constraint Models. Then, if human intervention is needed, a multimodal approach, where the user input is combined with the aforementioned models, is applied to produce, with a minimum user effort, the desired output. This approach offers the practical advantages of a de-coupled model (e.g. input-system + parameterized rules + post-processor), keeping at the same time the error-recovery power of an integrated approach, where all the steps of the process are performed in the same formal machine (as in a typical HMM in speech recognition) to avoid that an error at a given step remains unrecoverable in the subsequent steps. After a presentation of the theoretical basis of the proposed multi-source information system, its application to two real world problems, as an example of the possibilities of this architecture, is addressed. The experimental results obtained demonstrate that a significant user effort can be saved when using the proposed procedure. A simple demonstration, to better understand and evaluate the proposed system, is available on the web https://demos.iti.upv.es/hi/. (C) 2015 Elsevier B.V. All rights reserved.Navarro Cerdan, JR.; Llobet Azpitarte, R.; Arlandis, J.; Perez-Cortes, J. (2016). Composition of Constraint, Hypothesis and Error Models to improve interaction in Human-Machine Interfaces. Information Fusion. 29:1-13. doi:10.1016/j.inffus.2015.09.001S1132
Diagnostic and Prognostic Value of Cardiac Imaging in Amyloidosis
[Abstract]
Amyloidosis is an infiltrative disease caused by extracellular protein deposition
that has accumulated a lot of scientific production in recent years. Different types
of amyloidosis can affect the heart. Transthyretin amyloidosis and light chain
amyloidosis are the two most common types of cardiac amyloidosis. These
entities have a poor prognosis, so accurate diagnostic techniques are imperative
for determining an early therapeutic approach. Recent advances in cardiac
imaging and diagnostic strategies show that these tools are safe and can avoid the
use of invasive diagnostic techniques to histological confirmation, such as
endomyocardial biopsy. We performed a review on the diagnostic and prognostic
implications of different cardiac imaging techniques in cardiac amyloidosis. We
mainly focus on reviewing echocardiography, cardiac magnetic resonance,
computed tomography and nuclear imaging techniques and the different safety
measurements that can be done with each of them
Antecipação da diagnose foliar em arroz de sequeiro
The objective of this work was to evaluate the possibility of anticipation of foliar sampling in upland rice, in order to enable nutritional diagnosis for timely intervention. One hundred and seven leaf samples were collected from genotype trials of Embrapa Rondônia, in the state of Rondônia, Brazil, in three sampling times: anticipated, at 30 and 40 days after sowing (DAS); and standard, at 65 DAS. Composition nutrient diagnosis (CND) norms were obtained for each evaluated time and used for diagnosis on all evaluation times, comparing the results from the potential response to fertilization under two or three nutritional sufficiency classes, and checking the degree of agreement between the diagnostics. The use of two sufficiency classes increases the possibility of anticipating sampling time for foliar diagnosis, which would enable timely nutritional diagnosis to correct or mitigate eventual nutritional deficiencies. The anticipation of foliar diagnosis in upland rice depends on the development of specific nutritional diagnosis norms for each sampling time.O objetivo deste trabalho foi avaliar a possibilidade de antecipar a amostragem foliar em arroz de sequeiro, para viabilizar o diagnóstico nutricional em tempo hábil para intervenção. Foram coletadas 107 amostras foliares em ensaios de materiais genéticos da Embrapa Rondônia, no Estado de Rondônia, em três épocas de amostragem: antecipada, aos 30 e 40 dias após a semeadura (DAS); e padrão, aos 65 DAS. Foram obtidas as normas de diagnose da composição nutricional (CND) para cada época avaliada, as quais foram utilizadas para o diagnóstico em todas as épocas, tendo-se comparado os resultados do potencial de resposta à adubação sob duas ou três classes de suficiência nutricional, e verificado o grau de concordância entre os diagnósticos. O uso de duas classes de suficiência aumenta a possibilidade da antecipação da época de amostragem para diagnose foliar, o que viabilizaria o diagnóstico nutricional em tempo hábil para a correção ou a mitigação de eventuais deficiências nutricionais. A antecipação da diagnose foliar em arroz de sequeiro depende do desenvolvimento de normas de diagnose especÃficas para cada perÃodo amostral
Journals’ policies of storage and reuse of raw research data and their impact in five scientific areas
Analisys of journals' policies about storage and re-use of raw research data
Monte Carlo flattening filter design to high energy intraoperative electron beam homogenization
[EN] Intraoperative radiotherapy using mobile linear accelerators is used for a wide variety of malignancies. However, when large fields are used in combination with high energies, a deterioration of the flatness dose profile is measured with respect to smaller fields and lower energies. Indeed, for the LIAC HWL of Sordina, this deterioration is observed for the 12 MeV beam combined with 10 cm (or larger) diameter applicator. Aimed to solve this problem, a flattening filter has been designed and validated evaluating the feasibility of its usage at the upper part of the applicator. The design of the filter was based on Monte Carlo simulations because of its accuracy in modeling components of clinical devices, among other purposes. The LIAC 10 cm diameter applicator was modeled and simulated independently by two different research groups using two different MC codes, reproducing the heterogeneity of the 12 MeV energy beam. Then, an iterative process of filter design was carried out. Finally, the MC designed conical filter with the optimal size and height to obtain the desired flattened beam was built in-house using a 3D printer. During the experimental validation of the applicator-filter, percentage depth dose, beam profiles, absolute and peripheral dose measurements were performed to demonstrate the effectiveness of the filter addition in the applicator. These measurements conclude that the beam has been flattened, from 5.9% with the standard configuration to 1.6% for the configuration with the filter, without significant increase of the peripheral dose. Consequently, the new filter-applicator LIAC configuration can be used also in a conventional surgery room. A reduction of 16% of the output dose and a reduction of 1.1 mm in the D50 of the percentage depth dose was measured with respect to the original configuration. This work is a proof-of-concept that demonstrates that it is possible to add a filter able to flatten the beam delivered by the Sordina LIAC HWL. Future studies will focus on more refined technical solutions fully compatible with the integrity of the applicator, including its sterilization, to be safely introduced in the clinical practice.The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Giuseppe Felici reports a relationship with S.I.T. Sordina IORT Technologies S.p.A. that includes: employment. We thank the professionals and facilities at the 3D printing and metrology department in the Mechanics Unit at IFIC. JV thanks I. Diaz for measuring the PLA density. We thank S.I.T. SORDINA IORT Tech-nologies SpA for providing the applicator used for testing the filter during the measurements. JV, FB, and JP would like to acknowledge the Spanish "Ministerio de Ciencia e Innovacion" (MCIN) grant PID2021-125096NB-I00 funded by MCIN/AEI/10.13039 and the "Generalitat Valenciana" (GVA) grant PROMETEO/2021/064.Oliver-Gil, S.; Vijande, J.; Tejedor-Aguilar, N.; Miró Herrero, R.; Rovira-Escutia, JJ.; Ballester, F.; Juste-Vidal, B.... (2023). Monte Carlo flattening filter design to high energy intraoperative electron
beam homogenization. Radiation Physics and Chemistry. 212. https://doi.org/10.1016/j.radphyschem.2023.11110221
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