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Developing spatially and thematically detailed backdated maps for land cover studies

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International Journal of Digital Earth 2017年第2期10卷 175-206页

作者： Juan JoséVidal-Macua Alaitz Zabala Miquel Ninyerola xavier pons Dep Geografia Grumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain Dep Biologia Animal Vegetal i EcologiaGrumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain

Global or regional land cover change on a decadal time scale can be studied at a high level of detail using the availability of remote sensing data such as that provided by ***,there are three main technical challenges in this ***,the generation of land cover maps without reference data is problematic(backdating).Second,it is important to maintain high accuracies in land cover change map products,requiring a reasonably rich legend within each ***,a high level of automation is necessary to aid the management of large volumes of *** paper describes a robust methodology for processing time series of satellite data over large spatial *** methodology includes a retrospective analysis used for the generation of training and test data for historical periods lacking reference *** methodology was developed in the context of research on global change in the Iberian *** this study we selected two scenes covering geographic regions that are representative of the Iberian *** each scene,we present the results of two classifications(1985-1989 and 2000-2004 quinquennia),each with a legend of 13 *** overall accuracy of over 92%was obtained for all 4 maps.

关键词： Land cover mapping Landsat statistical classifiers backdating Iberian Peninsula

Narrow band imaging and white light endoscopy in the characterization of a polypectomy scar:A single-blind observational study

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World Journal of Gastroenterology 2018年第45期24卷 5179-5188页

作者： Fausto Riu pons Montserrat Andreu Javier Gimeno Beltran Marco Antonioálvarez-Gonzalez Agustín Seoane Urgorri Josep Maria Dedeu Luis Barranco Priego xavier Bessa Gastroenterology Department Hospital del MarBarcelona 08003Spain IMIM(Hospital del Mar Medical Research Institute) Barcelona 08003Spain Department of Medicine Autonomous University of BarcelonaBarcelona 08003Spain Pompeu Fabra University Barcelona 08003Spain Pathology Department Hospital del MarBarcelona 08003Spain.

AIM To assess the incremental benefit of narrow band imaging(NBI) and white light endoscopy(WLE), randomizing the initial technique for the detection of residual neoplasia at the polypectomy scar after an endoscopic piecemeal mucosal resection(EPMR).METHODS We conducted an observational study in an academic center to assess the incremental benefit of NBI and WLE randomly applied 1:1(NBI-WLE or WLE-NBI) in the follow-up of a post-EPMR scar by the same *** A total of 112 EPMR scars were included. The median baseline polyp size was 20 mm(interquartile range: 14-30). At first review, NBI and WLE showed good sensitivity(85.0% vs 78.9%), specificity(77.1% vs 84.2%) and overall accuracy(80.0% vs 82.5%). NBI after WLE(WLE-NBI group) improved accuracy, but this difference was not statistically significant [area under the curve(AUC): 86.8% vs 81.6%, P = 0.15]. WLE after NBI(NBI-WLE group) did not improve accuracy(AUC: 81.4% vs 81.1%, P = 0.9). Overall, recurrence was found in 39/112(34.8%) *** Although no statistically significant differences were found between the two techniques at the first postEPMR assessment, the use of NBI after WLE may improve residual neoplasia detection. Nevertheless, biopsy is still required in the first scar review.

关键词： Colonoscopy Narrow band imaging Endoscopic mucosal resection

rate of adverse events of gastroduodenal snare polypectomy for non-flat polyp is low: A prospective and multicenter study

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World Journal of Gastroenterology 2017年第47期23卷 8405-8414页

作者： Henry Córdova Lidia Argüello Carme Loras Antonio Naranjo Rodríguez Faust Riu pons Joan B Gornals David Nicolás-Pérez xavier Andújar Murcia Luis Hernández Santos Santolaria Carles Leal Carles pons Enrique Pérez-Cuadrado-Robles Orlando García-Bosch Michel Papo Berger José Luis Ulla Rocha Cristina Sánchez-Montes Gloria Fernández-Esparrach Endoscopy Unit.Institut de Malalties Digestives Hospital ClínicIDIBAPSCIBERehdUniversitat de Barcelona Digestive Endoscopy Unit Digestive Diseases DepartmentGastrointestinal Endoscopy Research GroupIISLa Fe Polytechnic University Hospital Hospital Universitari Mútua de Terrassa CIBERehd Hospital Reina Sofía Hospital Del Mar Hospital Universitari de Bellvitge IDIBELLUniversitat de BarcelonaHospitalet de Llobregat Hospital Universitario de Canarias Hospital Santos Reyes Aranda de Duero Hospital San Jorge Consorci Hospitalari de Vic Universitat de Vic Hospital de Viladecans Hospital Morales Meseguer Hospital Moisès Broggi Sant Joan Despí Hospital Joan XXIII Complejo Hospitalario de Pontevedra

AIM To evaluate the rate of adverse events(AEs) during consecutive gastric and duodenal polypectomies in several Spanish centers. METHODS Polypectomies of protruded gastric or duodenal polyps ≥ 5 mm using hot snare were prospectively included. Prophylactic measures of hemorrhage were allowed in predefined cases. AEs were defined and graded according to the lexicon recommended by the American Society for Gastrointestinal Endoscopy. Patients were followed for 48 h, one week and 1 mo after theprocedure. RESULTS308 patients were included and a single polypectomy was performed in 205. Only 36(11.7%) were on prior anticoagulant therapy. Mean polyp size was 15 ± 8.9 mm(5-60) and in 294 cases(95.4%) were located in the stomach. Hemorrhage prophylaxis was performed in 219(71.1%) patients. Nine patients presented AEs(2.9%), and 6 of them were bleeding(n = 6, 1.9%)(in 5 out of 6 AE, different types of endoscopic treatment were performed). Other 24 hemorrhagic episodes could be managed without any change in the outcome of the endoscopy and, consequently, were considered incidents. We did not find any independent risk factor of *** Gastroduodenal polypectomy using prophylactic measures has a rate of AEs small enough to consider this procedure a safe and effective method for polyp resection independently of the polyp size and location.

关键词： Polypectomy Bleeding Adverse events Protruded polyps Gastroduodenal Foregut

Role of capsule endoscopy in suspected celiac disease: A European multi-centre study

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World Journal of Gastroenterology 2017年第4期23卷 703-711页

作者： Marisol Luján-Sanchis Enrique Pérez-Cuadrado-Robles Javier Garcia-Lledo José-Francisco Juanmartinena Fernandez Luca Elli Victoria-Alejandra Jiménez-García Juan Egea-Valenzuela Julio Valle-Munoz Cristina Carretero-Ribón Ignacio Fernández-Urién-Sainz Antonio López-Higueras Noelia Alonso-Lazaro Mileidis Sanjuan-Acosta Francisco Sanchez-Ceballos Bruno Rosa Santiago González-Vázquez Federica Branchi Lucía Ruano-Díaz César Prieto-de-Frías Vicente pons-Beltrán Pilar Borque-Barrera Begona González-Suárez Sofía xavier Federico Argüelles-Arias Juan-Manuel Herrerías-Gutiérrez Enrique Pérez-Cuadrado-Martínez Javier Sempere-García-Argüelles Digestive Diseases Unit General University Hospital of Valencia Small Bowel Unit Hospital Morales Meseguer Digestive Diseases Unit General University Gregorio Maranón Unit of Gastroenterology and Endoscopy Complejo Hospitalario de Navarra Center for prevention and Diagnosis of Celiac Disease Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico Unit of Gastroenterology and Endoscopy University Hospital Virgen Macarena Gastroenterology department Hospital Virgen de la Arrixaca Department of Gastroenterology Complejo Hospitalario de Toledo Department of Gastroenterology University of Navarra Clinic1 Endoscopy Digestive Unit Digestive Diseases AreaUniversitari i Politècnic La Fe Hospital1 Digestive Diseases Unit University Hospital Nuestra Senora de Candelaria1 Digestive Diseases Unit Clinical Hospital San Carlos1 Digestive Diseases Unit Hospital da Senhora da Oliveira-Guimaraes1 Endoscopy Digestive Unit Hospital Clinic de Barcelona

AIM To analyze the diagnostic yield(DY), therapeutic impact(TI) and safety of capsule endoscopy(CE).METHODS This is a multi-centre, observational, analytical, retrospective study. A total of 163 patients with suspicion of celiac disease(CD)(mean age = 46.4 ± 17.3 years, 68.1% women) who underwent CE from 2003 to 2015 were included. Patients were divided into four groups: seronegative CD with atrophy(Group-Ⅰ, n = 19), seropositive CD without atrophy(Group-Ⅱ, n = 39), contraindication to gastroscopy(Group-Ⅲ, n = 6), seronegative CD without atrophy, but with a compatible context(Group-Ⅳ, n = 99). DY, TI and the safety of CE were *** The overall DY was 54% and the final diagnosis was villous atrophy(n = 65, 39.9%), complicated CD(n = 12, 7.4%) and other enteropathies(n = 11, 6.8%; 8 Crohn's). DY for groups Ⅰ to Ⅳ was 73.7%, 69.2%, 50% and 44.4%, respectively. Atrophy was located in duodenum in 24 cases(36.9%), diffuse in 19(29.2%), jejunal in 11(16.9%), and patchy in 10 cases(15.4%). Factors associated with a greater DY were positive serology(68.3% vs 49.2%, P = 0.034) and older age(P = 0.008). On the other hand, neither sex nor clinical presentation, family background, positive histology or HLA status were associated with DY. CE resultschanged the therapeutic approach in 71.8% of the cases. Atrophy was associated with a greater TI(92.3% vs 45.3%, P < 0.001) and 81.9% of the patients responded to diet. There was one case of capsule retention(0.6%). Agreement between CE findings and subsequent histology was 100% for diagnosing normal/other conditions, 70% for suspected CD and 50% for complicated *** CE has a high DY in cases of suspicion of CD and it leads to changes in the clinical course of the disease. CE is safe procedure with a high degree of concordance with histology and it helps in the differential diagnosis of CD.

关键词：囊内视镜检查法腹的疾病 Anti-transglutaminase 抗体没有面筋的饮食非腹的面筋敏感