The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform

Diogo Ayres-de-campos - One of the best experts on this subject based on the ideXlab platform.

  • Computer Analysis of foetal monitoring signals.
    Best practice & research. Clinical obstetrics & gynaecology, 2015
    Co-Authors: Inês Nunes, Diogo Ayres-de-campos
    Abstract:

    Five systems for Computer Analysis of foetal monitoring signals are currently available, incorporating the evaluation of cardiotocographic (CTG) or combined CTG with electrocardiographic ST data. All systems have been integrated with central monitoring stations, allowing the simultaneous monitoring of several tracings on the same Computer screen in multiple hospital locations. Computer Analysis elicits real-time visual and sound alerts for health care professionals when abnormal patterns are detected, with the aim of prompting a re-evaluation and subsequent clinical action, if considered necessary. Comparison between the CTG analyses provided by the Computer and clinical experts has been carried out in all systems, and in three of them, the accuracy of Computer alerts in predicting newborn outcomes was evaluated. Comparisons between these studies are hampered by the differences in selection criteria and outcomes. Two of these systems have just completed multicentre randomised clinical trials comparing them with conventional CTG monitoring, and their results are awaited shortly. For the time being, there is limited evidence regarding the impact of Computer Analysis of foetal monitoring signals on perinatal indicators and on health care professionals' behaviour.

  • Comparison of the effect of different sampling modes on Computer Analysis of cardiotocograms
    Computers in biology and medicine, 2015
    Co-Authors: Hernâni Gonçalves, Diogo Ayres-de-campos, Joana Chaves, Antónia Costa, João Bernardes
    Abstract:

    BackgroundCardiotocographic (CTG) monitors may provide fetal heart rate (FHR) signals as beat-to-beat (BTB) or alternatively at a fixed sampling rate. The aim of this study was to assess the effect of different sampling modes on the evaluation provided by a commercially available system for Computer Analysis of CTGs. MethodsInternal FHR signals were acquired during the last hour of labor in 27 singleton term cephalic pregnancies, using the STAN S31? fetal monitor (Neoventa, Gothemburg, Sweden). BTB and 4Hz sampling outputs of the monitor were compared using the Omniview-SisPorto? system for Computer Analysis of CTGs (Speculum, Lisbon, Portugal). The following parameters were analyzed: signal loss, signal quality, baseline, accelerations, decelerations, percentage of abnormal short-term variability (%aSTV), abnormal long-term variability (%aLTV), average short-term variability (avSTV) and the system's clinical alerts. Statistical inference was performed using the Spearman correlation coefficient, 95% nonparametric confidence intervals, Wilcoxon and McNemar statistical tests, setting significance at 0.05, and a non-parametric measure of disagreement (valued 0-1 from lowest to highest disagreement). ResultsComparing BTB with 4Hz sampling, the median values for signal quality (95% versus 96%), number of accelerations (5 versus 7) and %aSTV (31 versus 39) were significantly lower in the former. On the other hand, with BTB signals the median value of avSTV was significantly higher (3.1 versus 2.3). Nevertheless, BTB and 4Hz parameters were highly correlated (r=0.89-0.97), and there were no significant differences in the quantification of the number of decelerations or in the clinical alerts elicited by the system. ConclusionsIn conclusion, different sampling modes have a significant effect on the parameters provided by Computer Analysis of CTGs that are related with the quantification of STV, with a small impact on baseline estimation and on the subsequent quantification of accelerations. However, there does not seem to be significant impact on the quantification of decelerations or on the alerts provided by the system. FHR sampling mode affects usual Computer Analysis of CTGs.Effect of FHR sampling mode on Computer Analysis depends on parameters definition.Alerts in Computer Analysis of CTGs should take into account the FHR sampling mode.

André J. P. M. Smout - One of the best experts on this subject based on the ideXlab platform.

  • Computer Analysis of 24-h esophageal impedance signals
    Scandinavian journal of gastroenterology, 2010
    Co-Authors: Gerrit J. Hemmink, Albert J. Bredenoord, Marissa C. Aanen, Bas L. Weusten, Robin Timmer, André J. P. M. Smout
    Abstract:

    Abstract Objective. To assess the accuracy of newly developed software for detection of gastro-esophageal reflux episodes in ambulatory 24-h impedance tracings. Material and methods. 24-h esophageal impedance recordings obtained from 60 consecutive patients with reflux symptoms were used in this study. The impedance tracings of the first 10 consecutive patients were analyzed manually by three investigators. Liquid-containing reflux episodes and their proximal extent were scored. A consensus between the three investigators was used as a gold standard. Computer Analysis using dedicated software was performed, and the results were compared with the results of the consensus agreement. In addition, in order to assess the accuracy of symptom association Analysis 24-h impedance tracings of all 60 patients were analyzed both manually by one investigator and using Computer software. The number of reflux episodes and the results of symptom association Analysis obtained by the human and Computer Analysis software we...

B Van Ginneken - One of the best experts on this subject based on the ideXlab platform.

  • Computer Analysis of computed tomography scans of the lung a survey
    IEEE Transactions on Medical Imaging, 2006
    Co-Authors: Ingrid C Sluimer, Arnold M R Schilham, Mathias Prokop, B Van Ginneken
    Abstract:

    Current computed tomography (CT) technology allows for near isotropic, submillimeter resolution acquisition of the complete chest in a single breath hold. These thin-slice chest scans have become indispensable in thoracic radiology, but have also substantially increased the data load for radiologists. Automating the Analysis of such data is, therefore, a necessity and this has created a rapidly developing research area in medical imaging. This paper presents a review of the literature on Computer Analysis of the lungs in CT scans and addresses segmentation of various pulmonary structures, registration of chest scans, and applications aimed at detection, classification and quantification of chest abnormalities. In addition, research trends and challenges are identified and directions for future research are discussed.

Tomoaki Ikeda - One of the best experts on this subject based on the ideXlab platform.

Inês Nunes - One of the best experts on this subject based on the ideXlab platform.

  • Computer Analysis of foetal monitoring signals.
    Best practice & research. Clinical obstetrics & gynaecology, 2015
    Co-Authors: Inês Nunes, Diogo Ayres-de-campos
    Abstract:

    Five systems for Computer Analysis of foetal monitoring signals are currently available, incorporating the evaluation of cardiotocographic (CTG) or combined CTG with electrocardiographic ST data. All systems have been integrated with central monitoring stations, allowing the simultaneous monitoring of several tracings on the same Computer screen in multiple hospital locations. Computer Analysis elicits real-time visual and sound alerts for health care professionals when abnormal patterns are detected, with the aim of prompting a re-evaluation and subsequent clinical action, if considered necessary. Comparison between the CTG analyses provided by the Computer and clinical experts has been carried out in all systems, and in three of them, the accuracy of Computer alerts in predicting newborn outcomes was evaluated. Comparisons between these studies are hampered by the differences in selection criteria and outcomes. Two of these systems have just completed multicentre randomised clinical trials comparing them with conventional CTG monitoring, and their results are awaited shortly. For the time being, there is limited evidence regarding the impact of Computer Analysis of foetal monitoring signals on perinatal indicators and on health care professionals' behaviour.