1,721,008 research outputs found
Feasibility study of intraoperative surgical navigation with focus on ureteral identification using the EVA system on an animal model.
No full textBackground: Ureteral injury (UI) stands as one of the most prevalent forms of iatrogenic urological injury.
Currently, there is no non-invasive prevention strategy available to mitigate the risk of UI. Encouraging,
though still in the preclinical phase, are investigations into the identification of ureters using ureter-specific
vital dyes. Numerous studies are delving into the application of extended reality in the surgical fild. Our
research team is in the process of validating surgical navigation utilizing the EVA system. This system introduces
a dynamic extended reality (XR) environment that presents real-time 3D models of patient-specific
organs superimposed and synchronized with the endoscopic view during surgery. Our aims is to validate
surgical navigation with the EVA system in a biological context and apply it for ureters identification.
Materials and Methods: A trained surgeon evaluated the setting and the calibration between the images
from the endoscope and 3D models. The startup and installation times, integration into the operating room,
system usability and calibration errors were analyzed. Than four surgeons identified the ureters with and
without the EVA system. Their experience was assessed through questionnaires.
Results: The system is safe and easily integrable with the operating room instruments. The error after automatic
calibration remains significant but is easily correctable with manual calibration. The virtual ureter
overlaps with the real ureter. The questionnaires highlight that surgeons appreciated the EVA navigation
system, integrating well as a supportive tool alongside traditional instrumentation.
Conclusions: This study demonstrates how surgical navigation in a biological and in vivo setting is possible
through the EVA system. The virtual ureter overlaps with the real ureter, leading us to consider it
as a valuable aid for its identification in complex fields. Further studies are needed to reduce the error of
automatic calibration and minimize the need for manual calibration
DIVERTICULITIS. EMERGENCY SURGERY WITH OR WITHOUT RESECTION?
No full textIn patients with purulent or feculent peritonitis operative therapy without resection is generally not an appropriate alternative to colectomy
DIVERTICULITIS. RESECTION AND COLORECTAL ANASTOMOSIS WITH OR WTHOUT DIVERTING OSTOMY OR RESECTION AND END-COLOSTOMY ?
No full textFollowing resection, the decision to restore bowel continuity must incorporate patient factors, intraoperative factors, and surgeon preference
DIVERTICULITIS. WHEN URGENT SIGMOID COLECTOMY?
No full textUrgent sigmoid colectomy is required for patients with diffuse peritonitis or for those in whom non-operative management of acute diverticulitis fails
PUPPET MENTORING: A NEW SIMULATION SCENARIO FOR LEARNING SURGICAL ABILITIES
No full textSurgical simulators are now able to teach in a way that the learning curve of young surgeons can progress in a lab faster than when using other teaching models (cadaveric or animal) or real patients. The impact of surgical simulators is confirmed by the fact that, in the US, standardized training courses are needed to acquire the Board of Surgery certification. The virtual simulator set up at the University of Genoa (eLaparo4D) is based on two key features: a convincing haptic feedback and a limited cost. Nevertheless, the main issue of eLaparo4D is the “simplicity” of the virtual scenario. To improve it, a new model of simulation is proposed in this project: the “puppet mentoring”, that might enhance its characteristics. The “puppet mentoring” is based on the
recording of the movements of the surgeon in the real clinical scenario, that are transferred to the virtual machine. The apprentice, in his learning session, could be led through the operation by the simulator itself, in a scenario and in a way is the same of the real one
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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