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Exploiting Deep Learning Techniques for Colon Polyp Segmentation

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Computers, Materials & Continua 2021年第5期67卷 1629-1644页

作者： Daniel Sierra-Sosa Sebastian Patino-Barrientos Begonya Garcia-Zapirain cristian castillo-oleam Adel Elmaghraby Department of Computer Science and Engineering University of LouisvilleLouisvilleKYUSA Centro de Computacion Cientifica Apolo at Universidad EAFIT MedelinColombia eVida Research Group University of DeustoBilbaoSpain

As colon cancer is among the top causes of death, there is a growinginterest in developing improved techniques for the early detection of colonpolyps. Given the close relation between colon polyps and colon cancer,their detection helps avoid cancer cases. The increment in the availability ofcolorectal screening tests and the number of colonoscopies have increasedthe burden on the medical personnel. In this article, the application of deeplearning techniques for the detection and segmentation of colon polyps incolonoscopies is presented. Four techniques were implemented and evaluated:Mask-RCNN, PANet, Cascade R-CNN and Hybrid Task Cascade (HTC).These were trained and tested using CVC-Colon database, ETIS-LARIBPolyp, and a proprietary dataset. Three experiments were conducted to assessthe techniques performance: (1) Training and testing using each databaseindependently, (2) Mergingd the databases and testing on each database independently using a merged test set, and (3) Training on each dataset and testingon the merged test set. In our experiments, PANet architecture has the bestperformance in Polyp detection, and HTC was the most accurate to segmentthem. This approach allows us to employ Deep Learning techniques to assisthealthcare professionals in the medical diagnosis for colon cancer. It is anticipated that this approach can be part of a framework for a semi-automatedpolyp detection in colonoscopies.

关键词： Colon polyps deep learning image segmentation

Natural variability of essential oil and antioxidants in the medicinal plant Turnera diffusa

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Asian Pacific Journal of Tropical Medicine 2017年第2期10卷 114-119页

作者： Ana Lucía Urbizu-González Octelina castillo-Ruiz Guillermo cristian Guadalupe Martínez-Ávila Jorge Ariel Torres-castillo Universidad Autónoma de Tamaulipas Instituto de Ecología AplicadaDivisión del Golfo 356Col.Libertad87019Ciudad VictoriaTamaulipasMéxico Universidad Autónoma de Tamaulipas Unidad Académica Multidisciplinaria Reynosa AztlánCalle 16 y Lago de Chápala s/n Col.AztlánC.P.88740ReynosaTamaulipasMéxico Universidad Autónoma de Nuevo León Facultad de AgronomíaFrancisco Villa s/n.Col.Ex Hacienda El Canadá66050General EscobedoNuevo LeónMéxico

Objective:To evaluate differences in yield and composition of the essential oil and antioxidant contents in *** plants from localities in central region of ***:Samples were collected in Tamaulipas,Mexico in the arid *** oil was obtained through steam distillation and analyzed using *** contents,antioxidant activities using ABTS and ferric reducing antioxidant power(FRAP) methods also were ***:A total of 21 compunds were identified in the essential oils;nevertheless,only Eucalyptol,1,4-Methanocycloocta[d]pyridazine,1,4,4a,5,6,9,10,10a-octahydro-11,11-dimethyl-,(1à,4à,4aà,10aà) y Ethanone,1-(1,3-dimethyl-3-cyclohexen-1-yl) were detected in the three *** contents were registered in the sample from Padrón y Juárez with phenolic content of 33.85 mg GAE/g of dry material and antioxidant activities with ABTS 72.32% and with FRAP 21.33 mg GAE/g of dry *** differences were observed in essential oil,phenolics and antioxidants contents between ***:Results suggest that climatic differences and origin influence the phytochemicals in the medicinal plant ***,and thus,it is worth to consider such effects for industrial and medicinal purposes.

关键词： Essential oil Antioxidants Phytochemicals Chemical variation

Seroprevalence study of infection with influenza A(H1N1)pdm09 virus in San Felipe Town, Chile

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World Journal of Cardiovascular Diseases 2013年第7期3卷 476-482页

作者： olea Andrea Fasce Rodrigo Aguilera Ximena Oliva Otavio Munoz Sergio Garcia Maritza Pedroni Elena Najera Manuel Guerrero Andrea Bustos Patricia Mora Judith Vega Jeanette Cerda Jaime Abarca Katia McCarron Meg Widdowson Marc-Alain castillo Ernesto Alvarado Sergio Quijada Sandra Gallegos Doris Gonzalez Claudia Center of Epidemiology and Health Policies Department Faculty of MedicineUniversidad del DesarrolloConcepcionChile Section of Respiratory and Exanthematous viruses Sub-Department of Clinical VirologyInstitute of Public HealthMinistry of HealthSantiagoChile Center of Epidemiology and Health Policies of the Universidad del Desarrollo ConcepcionChile Panamerican Health Organization Washington DCUSA Public Health Department and Pediatrics Division Faculty of MedicinePontifical Catholic University of ChileSantiagoChile Centers for Diseases Control and Prevention AtlantaUSA Center for Micro Data Economics DepartmentUniversity of ChileSantiagoChile Epidemiology and Health Policies Department Universidad del DesarrolloConcepcionChile

Objective: To know the natural history of the first wave of pandemic influenza A(H1N1)pdm09 in the Southern hemisphere, through the detection of antibodies against influenza A(H1N1)pdm09 in a selected community, to estimate the population attack rate and its variations, the consultation rates, hospitallization and mortality rates. Methodology: A representative random sample of the population of a commune in Chile (San Felipe) was interviewed and taken blood samples between January and March 2010. A study against the antibodies of the influenza A(H1N1) pdm09 virus was conducted, by the technique of the Hemaglutination Inhibition (HAI) according to standardized methodology. Subjects with antibody titers ≥1:40 were considered positive. Results: 13.5% of the population of San Felipe had antibodies against influenza A(H1N1)pdm09;this percentage reached 30% of the population between 0 and 18 years and 6.1% among those over 19 years. The age variable was the only factor that evidenced significant differences in the prevalence of antibodies. There were no significant differences related to gender, vaccination history against seasonal inluenza, or comorbidity. 51% of people with positive serology showed IN-FLUENZA-LIKE SYMPTOMS. Conclusions: A relevant percentage of subclinical disease was detected in the first pandemic wave in Chile and the proportion of people with SARI and deaths was small. Data from epidemiological surveillance were useful to estimate the trend of TSI but not its magnitude.

关键词： Influenza A(H1N1)pdm09 Influenza Seroprevalence

Quick Review and Technical Approach for Regenerative Peripheral Nerve Interface Surgery

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Modern Plastic Surgery 2023年第4期13卷 126-131页

作者： Obed H Grajeda Chávez Andres Gallardo castillo Samantha Colchado Mariscal Xunaxi Guadalupe Vázquez Orozco Dulce Sánchez Dauth Carlos Javier Mata Quintero Jorge Montalvo Hernández Ricardo Palacios Merino Minerva Irene Hernandez cristian Diaz Solleiro Department of Surgery Pemex Hospital Central Norte Mexico City Mexico

Regenerative peripheral nerve interface RPNI’s surgery was originally designed for prosthetic control. RPNI’s has demonstrated to be an effective tool to prevent neuroma formation by providing free muscle grafts as physiological targets for peripheral nerve ingrowth. Nerve transection injuries can result in painful neuromas that adversely affect patient recovery. This is especially significant following amputation surgeries, but they can also be used in surgeries in which the nerves can be visualized with a noticeable lesion. The first series of patients undergoing RPNI implantation for treatment of symptomatic postamputation neuromas was published in 2016. The series included a report of 46 patients undergoing RPNI. The clinical outcomes of RPNI have been optimistic with a reduction in neuroma pain up to 73% and phantom pain reduction of 53% along the uniformly high patient satisfaction. Since then, studies have been expanded, and knowledge regarding physiology has increased, providing us with new tools for a better understanding and giving these procedures more benefits and applications.

关键词： Component Formatting Style Styling Insert