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Raposo A, Marques L, Correia R, Melo F, Valente J, Pereira T, Rosário LB, Froes F, Sanches J, da Silva HP. e-CoVig: A Novel mHealth System for Remote Monitoring of Symptoms in COVID-19. Sensors (Basel) 2021; 21:s21103397. [PMID: 34068131 PMCID: PMC8152780 DOI: 10.3390/s21103397] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/03/2021] [Accepted: 05/08/2021] [Indexed: 12/15/2022]
Abstract
In 2019, a new virus, SARS-CoV-2, responsible for the COVID-19 disease, was discovered. Asymptomatic and mildly symptomatic patients were forced to quarantine and closely monitor their symptoms and vital signs, most of the time at home. This paper describes e-CoVig, a novel mHealth application, developed as an alternative to the current monitoring paradigm, where the patients are followed up by direct phone contact. The e-CoVig provides a set of functionalities for remote reporting of symptoms, vital signs, and other clinical information to the health services taking care of these patients. The application is designed to register and transmit the heart rate, blood oxygen saturation (SpO2), body temperature, respiration, and cough. The system features a mobile application, a web/cloud platform, and a low-cost specific device to acquire the temperature and SpO2. The architecture of the system is flexible and can be configured for different operation conditions. Current commercial devices, such as oximeters and thermometers, can also be used and read using the optical character recognition (OCR) functionality of the system. The data acquired at the mobile application are sent automatically to the web/cloud application and made available in real-time to the medical staff, enabling the follow-up of several users simultaneously without the need for time consuming phone call interactions. The system was already tested for its feasibility and a preliminary deployment was performed on a nursing home showing promising results.
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Affiliation(s)
- Afonso Raposo
- Instituto Superior Técnico (IST), Av. Rovisco Pais n. 1, 1049-001 Lisboa, Portugal; (R.C.); (F.M.)
- Instituto de Sistemas e Robótica (ISR), Av. Rovisco Pais n. 1, Torre Norte—Piso 6, 1049-001 Lisboa, Portugal
- Correspondence: (A.R.); (J.S.); (H.P.d.S.)
| | - Luis Marques
- BrainAnswer, Lda., Rua Engenheiro Pires Marques, Lote 61, n. 5—Dto, 6000-406 Castelo Branco, Portugal; (L.M.); (J.V.)
| | - Rafael Correia
- Instituto Superior Técnico (IST), Av. Rovisco Pais n. 1, 1049-001 Lisboa, Portugal; (R.C.); (F.M.)
| | - Francisco Melo
- Instituto Superior Técnico (IST), Av. Rovisco Pais n. 1, 1049-001 Lisboa, Portugal; (R.C.); (F.M.)
| | - João Valente
- BrainAnswer, Lda., Rua Engenheiro Pires Marques, Lote 61, n. 5—Dto, 6000-406 Castelo Branco, Portugal; (L.M.); (J.V.)
- Escola Superior de Saúde Dr. Lopes Dias—Instituto Politécnico de Castelo Branco, Av. Pedro Alvares Cabral 12, 6000-084 Castelo Branco, Portugal
| | - Telmo Pereira
- Laboratory for Applied Health Research (LabinSaúde), Polytechnic Institute of Coimbra, Coimbra Health School, Rua 5 de Outubro—SM Bispo, Apartado 7006, 3046-854 Coimbra, Portugal;
| | - Luis Brás Rosário
- Centro Cardiovascular da Universidade de Lisboa (CCUL), Faculdade de Medicina da Universidade de Lisboa (FMUL), Av. Prof. Egas Moniz MB, 1649-028 Lisboa, Portugal;
| | - Filipe Froes
- Hospital Pulido Valente Intensive Care Unit, Alameda das Linhas de Torres, 117, 1769-001 Lisboa, Portugal;
| | - João Sanches
- Instituto Superior Técnico (IST), Av. Rovisco Pais n. 1, 1049-001 Lisboa, Portugal; (R.C.); (F.M.)
- Instituto de Sistemas e Robótica (ISR), Av. Rovisco Pais n. 1, Torre Norte—Piso 6, 1049-001 Lisboa, Portugal
- Correspondence: (A.R.); (J.S.); (H.P.d.S.)
| | - Hugo Plácido da Silva
- Instituto Superior Técnico (IST), Av. Rovisco Pais n. 1, 1049-001 Lisboa, Portugal; (R.C.); (F.M.)
- Instituto de Telecomunicações (IT), Av. Rovisco Pais n. 1, Torre Norte—Piso 10, 1049-001 Lisboa, Portugal
- Correspondence: (A.R.); (J.S.); (H.P.d.S.)
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Quaglino P, Prince H, Cowan R, Vermeer M, Papadavid L, Bagot M, Servitjie O, Berti E, Guenova E, Stadler R, Querfeld C, Busschots A, Hodak E, Patsatsi A, Sanches J, Maule M, Yoo J, Kevin M, Fava P, Ribero S, Zocchi L, Rubatto M, Fierro M, Wehkamp U, Marshalko M, Mitteldorf C, Akilov O, Ortiz-Romero P, Estrach T, Vakeva L, Enz P, Wobser M, Bayne M, Jonak C, Rubeta M, Forbes A, Bates A, Battistella M, Amel-Kashipaz R, Vydianath B, Combalia A, Georgiou E, Hauben E, Hong E, Jost M, Knobler R, Amitay-Laish I, Miyashiro D, Cury-Martins J, Martinez X, Muniesa C, Prag-Naveh H, Nikolaou V, Quint K, Ram-Wolff C, Rieger K, Stranzenbach R, Szepesi Á, Alberti-Violetti S, Felicity E, Cerroni L, Kempf W, Whittaker S, Willemze R, Kim Y, Scarisbrick J. Treatment of early-stage mycosis fungoides: results from the PROspective Cutaneous Lymphoma International Prognostic Index (PROCLIPI) study. Br J Dermatol 2021; 184:722-730. [PMID: 32479678 PMCID: PMC7704558 DOI: 10.1111/bjd.19252] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/22/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND The PROspective Cutaneous Lymphoma International Prognostic Index (PROCLIPI) study is a prospective analysis of an international database. Here we examine front-line treatments and quality of life (QoL) in patients with newly diagnosed mycosis fungoides (MF). OBJECTIVES To identify (i) differences in first-line approaches according to tumour-nodes-metastasis-blood (TNMB) staging; (ii) parameters related to a first-line systemic approach and (iii) response rates and QoL measures. METHODS In total, 395 newly diagnosed patients with early-stage MF (stage IA-IIA) were recruited from 41 centres in 17 countries between 1 January 2015 and 31 December 2018 following central clinicopathological review. RESULTS The most common first-line therapy was skin-directed therapy (SDT) (322 cases, 81·5%), while a smaller percentage (44 cases, 11·1%) received systemic therapy. Expectant observation was used in 7·3%. In univariate analysis, the use of systemic therapy was significantly associated with higher clinical stage (IA, 6%; IB, 14%; IIA, 20%; IA-IB vs. IIA, P < 0·001), presence of plaques (T1a/T2a, 5%; T1b/T2b, 17%; P < 0·001), higher modified Severity Weighted Assessment Tool (> 10, 15%; ≤ 10, 7%; P = 0·01) and folliculotropic MF (FMF) (24% vs. 12%, P = 0·001). Multivariate analysis demonstrated significant associations with the presence of plaques (T1b/T2b vs. T1a/T2a, odds ratio 3·07) and FMF (odds ratio 2·83). The overall response rate (ORR) to first-line SDT was 73%, while the ORR to first-line systemic treatments was lower (57%) (P = 0·027). Health-related QoL improved significantly both in patients with responsive disease and in those with stable disease. CONCLUSIONS Disease characteristics such as presence of plaques and FMF influence physician treatment choices, and SDT was superior to systemic therapy even in patients with such disease characteristics. Consequently, future treatment guidelines for early-stage MF need to address these issues.
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Affiliation(s)
- P. Quaglino
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - H.M. Prince
- Sir Peter MacCallum Department of Oncology, University of Melbourne, Australia
| | - R. Cowan
- Christie Hospital, Manchester UK
| | - M. Vermeer
- Leiden University Medical Centre, The Netherlands
| | | | - M. Bagot
- Hospital St Louis, Paris, France
| | - O. Servitjie
- Hospital Universitari de Bellvitge, Barcelona, Spain
| | | | | | - R. Stadler
- University Medical Centre, Johannes Wesling, Minden, Germany
| | - C. Querfeld
- City of Hope National Medical Center and Beckman Research Institute, Duarte, California, US
| | | | - E. Hodak
- Rabin Medical Center, Tel Aviv University, Israel
| | - A. Patsatsi
- Aristotle University of Thessaloniki, in Papageorgiou General Hospital, Greece
| | - J. Sanches
- University of Sao Paulo Medical School, Brazil, South America
| | - M. Maule
- Cancer Epidemiology Unit, Department Medical Sciences, University of Turin, Italy
| | - J. Yoo
- University Hospitals Birmingham, UK
| | - M. Kevin
- University Hospitals Birmingham, UK
| | - P. Fava
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - S. Ribero
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - L. Zocchi
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - M. Rubatto
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - M.T. Fierro
- Dermatologic Clinic, University of Turin Medical School, Torino, Italy
| | - U. Wehkamp
- University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | | | - C. Mitteldorf
- HELIOS Klinikum Hildesheim GmbH, University Medical Center Göttingen, Germany
| | - O. Akilov
- University of Pittsburgh School of Medicine, Pennsylvania, USA
| | | | - T. Estrach
- Hospital Clinico, University of Barcelona, Spain
| | - L. Vakeva
- Helsinki University Central Hospital, Finland
| | - P.A. Enz
- Hospital Italiano De Buenos Aires, Argentina, South America
| | - M. Wobser
- University Hospital Wuerzburg, Germany
| | | | - C. Jonak
- Dept of Dermatology, Medical University of Vienna, Austria
| | - M. Rubeta
- Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford UK
| | | | - A. Bates
- University Hospital Southampton, Southampton, UK
| | | | | | | | - A. Combalia
- Hospital Clinico, University of Barcelona, Spain
| | - E. Georgiou
- Aristotle University of Thessaloniki, in Papageorgiou General Hospital, Greece
| | - E. Hauben
- Belgium University Hospitals Leuven, Leuven, Belgium
| | | | - M. Jost
- University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - R. Knobler
- Dept of Dermatology, Medical University of Vienna, Austria
| | | | - D. Miyashiro
- University of Sao Paulo Medical School, Brazil, South America
| | - J. Cury-Martins
- University of Sao Paulo Medical School, Brazil, South America
| | - X. Martinez
- City of Hope National Medical Center and Beckman Research Institute, Duarte, California, US
| | - C. Muniesa
- Hospital Universitari de Bellvitge, Barcelona, Spain
| | | | | | - K. Quint
- Leiden University Medical Centre, The Netherlands
| | | | | | - R. Stranzenbach
- University Medical Centre, Johannes Wesling, Minden, Germany
| | - Á. Szepesi
- Semmelweis University, Budapest, Hungary
| | | | | | - L. Cerroni
- Department of Dermatology, Research Unit Dermatopathology, Medical University of Graz, Graz, Austria
| | - W. Kempf
- Kempf und Pfaltz, Histologische Diagnostik, Zurich, Switzerland
| | - S. Whittaker
- Kings College London, Guys and St Thomas NHS Foundation Trust, London
| | - R. Willemze
- Leiden University Medical Centre, The Netherlands
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Horwitz S, Scarisbrick J, Prince H, Whittaker S, Duvic M, Kim Y, Quaglino P, Zinzani P, Bechter O, Eradat H, Pinter-Brown L, Akilov O, Geskin L, Sanches J, Ortiz-Romero P, Lisano J, Brown L, Palanca-Wessels M, Gautam A, Bunn V, Little M, Dummer R. FINAL DATA FROM THE PHASE 3 ALCANZA STUDY: BRENTUXIMAB VEDOTIN (BV) VS PHYSICIAN'S CHOICE (PC) IN PATIENTS (PTS) WITH CD30-POSITIVE (CD30+) CUTANEOUS T-CELL LYMPHOMA (CTCL). Hematol Oncol 2019. [DOI: 10.1002/hon.96_2630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- S.M. Horwitz
- Department of Medicine; Memorial Sloan Kettering Cancer Center; New York United States
| | - J. Scarisbrick
- Department of Dermatology; University Hospital Birmingham; Birmingham United Kingdom
| | - H.M. Prince
- Division of Cancer Medicine; Peter MacCallum Cancer Centre and Sir Peter MacCallum Department of Oncology, The University of Melbourne; Melbourne Australia
| | - S. Whittaker
- St John's Institute of Dermatology; Guys and St Thomas NHS Foundation Trust; London United Kingdom
| | - M. Duvic
- Department of Dermatology; Division of Internal Medicine, The University of Texas MD Anderson Cancer Center; Houston United States
| | - Y.H. Kim
- Department of Dermatology; Stanford University School of Medicine and Stanford Cancer Institute; Stanford United States
| | - P. Quaglino
- Department of Medical Sciences; Dermatologic Clinic, University of Turin; Turin Italy
| | - P.L. Zinzani
- Institute of Haematology; University of Bologna; Bologna Italy
| | - O. Bechter
- Department of General Medical Oncology; University Hospitals Leuven; Leuven KU Belgium
| | - H. Eradat
- Division of Hematology-Oncology; David Geffen School of Medicine at UCLA; Los Angeles United States
| | - L. Pinter-Brown
- Division of Hematology Oncology; Chao Family Comprehensive Cancer Center, University of California; Irvine United States
| | - O. Akilov
- Department of Dermatology; University of Pittsburgh; Pittsburgh United States
| | - L. Geskin
- Department of Dermatology; Columbia University; New York United States
| | - J. Sanches
- Department of Dermatology; University of São Paulo Medical School; São Paulo Brazil
| | - P. Ortiz-Romero
- Department of Dermatology; University Hospital 12 de Octubre, Institute i+12 Medical School, University Complutense; Madrid Spain
| | - J. Lisano
- Medical Affairs; Seattle Genetics, Inc.; Bothell United States
| | - L. Brown
- Biostatistics; Seattle Genetics, Inc.; Bothell United States
| | | | - A. Gautam
- Global Medical Affairs; Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge United States
| | - V. Bunn
- Oncology Statistics; Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge United States
| | - M. Little
- Oncology Clinical Research; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge United States
| | - R. Dummer
- Department of Dermatology; University Hospital Zürich; Zürich Switzerland
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4
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Wehkamp U, Whittaker S, Servitje O, Berti E, Querfeld C, Bagot M, Stadler R, Stranzenbach R, Marschalko M, Busschots AM, Jost M, Sanches J, Ortiz-Romero P, Estrach T, Vakeva L, Jonak C, Akilov O, Hodak E, Mitteldorf C, Bates A, Beylot-Barry M, Cowan R, Pujol R, Matin R, Papadavid E, Quaglino P, Vermeer M, Kempf W, Kim Y, Scarisbrick J. T-cell receptor rearrangements in the skin and blood of patients in the PROCLIPI study: detection of clonal rearrangements in the skin (and blood) correlates with the B-class of MF and SS patients. Eur J Cancer 2019. [DOI: 10.1016/s0959-8049(19)30580-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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5
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Prince H, Dummer R, Whittaker S, Horwitz S, Duvic M, Scarisbrick J, Quaglino P, Zinzani P, Wolter P, Sanches J, Ortiz-Romero P, Akilov O, Geskin L, Huen A, Wang Y, Palanca-Wessels M, Richhariya A, Feliciano J, Zhu Y, Lin H, Liu Y, Little M, Zagadailov E, Dalal M, Kim Y. PATIENT-REPORTED OUTCOMES AND QUALITY OF LIFE IN PATIENTS WITH CUTANEOUS T CELL LYMPHOMA: RESULTS FROM THE PHASE 3 ALCANZA STUDY. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- H.M. Prince
- Division of Cancer Medicine, Peter MacCallum Cancer Centre and Sir Peter MacCallum Department of Oncology; The University of Melbourne; Melbourne Australia
| | - R. Dummer
- Department of Dermatology; University Hospital Zürich; Zürich Switzerland
| | - S. Whittaker
- St John's Institute of Dermatology; Guys and St Thomas NHS Foundation Trust; London UK
| | - S. Horwitz
- Department of Medicine; Memorial Sloan Kettering Cancer Center; New York USA
| | - M. Duvic
- Department of Dermatology; The University of Texas MD Anderson Cancer Center; Houston USA
| | - J. Scarisbrick
- Department of Dermatology; University Hospital Birmingham; Birmingham UK
| | - P. Quaglino
- Department of Medical Sciences, Dermatologic Clinic; University of Turin; Turin Italy
| | - P.L. Zinzani
- Institute of Haematology; University of Bologna; Bologna Italy
| | - P. Wolter
- Department of General Medical Oncology; University Hospitals Leuven; Leuven Belgium
| | - J. Sanches
- Department of Dermatology; University of São Paulo Medical School; São Paulo Brazil
| | - P. Ortiz-Romero
- Department of Dermatology; University Hospital 12 de Octubre, Institute i+12 Medical School, University Complutense; Madrid Spain
| | - O. Akilov
- Department of Dermatology; University of Pittsburgh; Pittsburgh USA
| | - L. Geskin
- Department of Dermatology; University of Pittsburgh; Pittsburgh USA
| | - A. Huen
- Department of Dermatology; The University of Texas MD Anderson Cancer Center; Houston USA
| | - Y. Wang
- Biometrics; Seattle Genetics, Inc.; Bothell USA
| | | | - A. Richhariya
- Market Access & Health Economics; Seattle Genetics, Inc.; Bothell USA
| | - J. Feliciano
- Value and Access; Seattle Genetics, Inc.; Bothell USA
| | - Y. Zhu
- Global Statistics; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - H. Lin
- Biostatistics; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - Y. Liu
- Biostatistics; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - M. Little
- Oncology Clinical Research; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - E. Zagadailov
- Global Outcomes Research; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - M. Dalal
- Global Outcomes Research; Millennium Pharmaceuticals Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - Y.H. Kim
- Department of Dermatology; Stanford University School of Medicine and Stanford Cancer Institute; Stanford USA
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Horwitz S, Whittaker S, Duvic M, Dummer R, Kim Y, Scarisbrick J, Quaglino P, Zinzani P, Wolter P, Eradat H, Sanches J, Ortiz-Romero P, Akilov O, Trotman J, Taylor K, Dalle S, Weichenthal M, Walewski J, Fisher D, Wang Y, Palanca-Wessels M, Lin H, Liu Y, Little M, Prince H. RESPONSE BY STAGE IN CD30-POSITIVE (CD30+) CUTANEOUS T CELL LYMPHOMA (CTCL) PATIENTS RECEIVING BRENTUXIMAB VEDOTIN (BV) VS PHYSICIAN'S CHOICE (PC) IN THE PHASE 3 ALCANZA STUDY. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- S. Horwitz
- Department of Medicine; Memorial Sloan Kettering Cancer Center; New York USA
| | - S. Whittaker
- St John's Institute of Dermatology, Guys and St Thomas NHS Foundation Trust; London UK
| | - M. Duvic
- Department of Dermatology; The University of Texas MD Anderson Cancer Center; Houston USA
| | - R. Dummer
- Department of Dermatology; University Hospital Zürich; Zürich Switzerland
| | - Y.H. Kim
- Department of Dermatology; Stanford University School of Medicine and Stanford Cancer Institute; Stanford USA
| | - J. Scarisbrick
- Department of Dermatology; University Hospital Birmingham; Birmingham UK
| | - P. Quaglino
- Department of Medical Sciences, Dermatologic Clinic; University of Turin; Turin Italy
| | - P. Zinzani
- Institute of Haematology; University of Bologna; Bologna Italy
| | - P. Wolter
- Department of General Medical Oncology; University Hospitals Leuven; Leuven Belgium
| | - H. Eradat
- Division of Hematology-Oncology; David Geffen School of Medicine at UCLA; Los Angeles USA
| | - J. Sanches
- Department of Dermatology; University of São Paulo Medical School; São Paulo Brazil
| | - P. Ortiz-Romero
- Department of Dermatology; University Hospital 12 de Octubre, Institute i+12 Medical School, University Complutense; Madrid Spain
| | - O. Akilov
- Department of Dermatology; University of Pittsburgh; Pittsburgh USA
| | - J. Trotman
- Haematology Department, Concord Repatriation General Hospital; University of Sydney; Sydney Australia
| | - K. Taylor
- Department of Haematology, ICON Cancer Care; South Brisbane Australia
| | - S. Dalle
- Department of Dermatology, Hospices Civils de Lyon; Claude Bernard Lyon 1 University; Lyon France
| | - M. Weichenthal
- Department of Dermatology; University Hospital of Schleswig-Holstein; Kiel Germany
| | - J. Walewski
- Department of Lymphoid Malignancies; Maria Sklodowska-Curie Institute and Oncology Centre; Warsaw Poland
| | - D. Fisher
- Department of Medical Oncology; Dana-Farber Cancer Institute; Boston USA
| | - Y. Wang
- Biometrics; Seattle Genetics, Inc.; Bothell USA
| | | | - H. Lin
- Biostatistics; Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - Y. Liu
- Biostatistics; Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - M. Little
- Oncology Clinical Research; Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited; Cambridge USA
| | - H.M. Prince
- Division of Cancer Medicine, Peter MacCallum Cancer Centre and Sir Peter MacCallum Department of Oncology; The University of Melbourne; Melbourne Australia
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Ribeiro AS, Carvalho FA, Figueiredo J, Carvalho R, Mestre T, Monteiro J, Guedes AF, Fonseca M, Sanches J, Seruca R, Santos NC, Paredes J. Atomic force microscopy and graph analysis to study the P-cadherin/SFK mechanotransduction signalling in breast cancer cells. Nanoscale 2016; 8:19390-19401. [PMID: 27847941 DOI: 10.1039/c6nr04465d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Physical forces mediated by cell-cell adhesion molecules, as cadherins, play a crucial role in preserving normal tissue architecture. Accordingly, altered cadherins' expression has been documented as a common event during cancer progression. However, in most studies, no data exist linking pro-tumorigenic signaling and variations in the mechanical balance mediated by adhesive forces. In breast cancer, P-cadherin overexpression increases in vivo tumorigenic ability, as well as in vitro cell invasion, by activating Src family kinase (SFK) signalling. However, it is not known how P-cadherin and SFK activation impact cell-cell biomechanical properties. In the present work, using atomic force microscopy (AFM) images, cell stiffness and cell-cell adhesion measurements, and undirected graph analysis based on microscopic images, we have demonstrated that P-cadherin overexpression promotes significant alterations in cell's morphology, by decreasing cellular height and increasing its area. It also affects biomechanical properties, by decreasing cell-cell adhesion and cell stiffness. Furthermore, cellular network analysis showed alterations in intercellular organization, which is associated with cell-cell adhesion dysfunction, destabilization of an E-cadherin/p120ctn membrane complex and increased cell invasion. Remarkably, inhibition of SFK signaling, using dasatinib, reverted the pathogenic P-cadherin induced effects by increasing cell's height, cell-cell adhesion and cell stiffness, and generating more compact epithelial aggregates, as quantified by intercellular network analysis. In conclusion, P-cadherin/SFK signalling induces topological, morphological and biomechanical cell-cell alterations, which are associated with more invasive breast cancer cells. These effects could be further reverted by dasatinib treatment, demonstrating the applicability of AFM and cell network diagrams for measuring the epithelial biomechanical properties and structural organization.
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Affiliation(s)
- A S Ribeiro
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - F A Carvalho
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - J Figueiredo
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - R Carvalho
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | | | - J Monteiro
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - A F Guedes
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | | | | | - R Seruca
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal and Medical Faculty of the University of Porto, Porto, Portugal
| | - N C Santos
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - J Paredes
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal and Medical Faculty of the University of Porto, Porto, Portugal
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Saba L, Dey N, Ashour AS, Samanta S, Nath SS, Chakraborty S, Sanches J, Kumar D, Marinho R, Suri JS. Automated stratification of liver disease in ultrasound: An online accurate feature classification paradigm. Comput Methods Programs Biomed 2016; 130:118-134. [PMID: 27208527 DOI: 10.1016/j.cmpb.2016.03.016] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 02/17/2016] [Accepted: 03/15/2016] [Indexed: 06/05/2023]
Abstract
PURPOSE Fatty liver disease (FLD) is one of the most common diseases in liver. Early detection can improve the prognosis considerably. Using ultrasound for FLD detection is highly desirable due to its non-radiation nature, low cost and easy use. However, the results can be slow and ambiguous due to manual detection. The lack of computer trained systems leads to low image quality and inefficient disease classification. Thus, the current study proposes novel, accurate and reliable detection system for the FLD using computer-based training system. MATERIALS AND METHODS One hundred twenty-four ultrasound sample images were selected retrospectively from a database of 62 patients consisting of normal and cancerous. The proposed training system was generated offline parameters using training liver image database. The classifier applied transformation parameters to an online system in order to facilitate real-time detection during the ultrasound scan. The system utilized six sets of features (a total of 128 features), namely Haralick, basic geometric, Fourier transform, discrete cosine transform, Gupta transform and Gabor transform. These features were extracted for both offline training and online testing. Levenberg-Marquardt back propagation network (BPN) classifier was used to classify the liver disease into normal and abnormal categories. RESULTS Random partitioning approach was adapted to evaluate the classifier performance and compute its accuracy. Utilizing all the six sets of 128 features, the computer aided diagnosis (CAD) system achieved classification accuracy of 97.58%. Furthermore, the four performance metrics consisting of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) realized 98.08%, 97.22%, 96.23%, and 98.59%, respectively. CONCLUSION The proposed system was successfully able to detect and classify the FLD. Furthermore, the proposed system was benchmarked against previous methods. The comparison established an advanced set of features in the Levenberg-Marquardt back propagation network reports a significant improvement compared to the existing techniques.
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Affiliation(s)
- Luca Saba
- Department of Radiology, Azienda Ospedaliero Universitaria (A.O.U.) di Cagliari - Polo di Monserrato, Università di Cagliari, Italy
| | - Nilanjan Dey
- Point-of-Care Devices, Global Biomedical Technologies, Inc., Roseville, CA, USA
| | - Amira S Ashour
- Department of Electronics and Electrical Communications Engineering, Faculty of Engineering, Tanta University, Egypt
| | - Sourav Samanta
- Point-of-Care Devices, Global Biomedical Technologies, Inc., Roseville, CA, USA
| | | | - Sayan Chakraborty
- Point-of-Care Devices, Global Biomedical Technologies, Inc., Roseville, CA, USA
| | - João Sanches
- Institute for Systems and Robotics (ISR), Instituto Superior Técnico (IST), Lisbon, Portugal
| | - Dinesh Kumar
- Point-of-Care Devices, Global Biomedical Technologies, Inc., Roseville, CA, USA
| | - RuiTato Marinho
- Liver Unit, Department of Gastroenterology and Hepatology, Hospital de Santa Maria, Medical School of Lisbon, Portugal
| | - Jasjit S Suri
- Point-of-Care Devices, Global Biomedical Technologies, Inc., Roseville, CA, USA; Electrical Engineering Department (Affl.), Idaho State University, ID, USA.
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Reis C, Domingues A, Mestre C, Ribeiro J, Sanches J, Paiva T. Individual variability to biological, hormonal and psychological responses to sleep deprivation. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.1486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Stockfleth E, Peris K, Guillen C, Cerio R, Basset‐Seguin N, Foley P, Sanches J, Culshaw A, Erntoft S, Lebwohl M. Physician perceptions and experience of current treatment in actinic keratosis. J Eur Acad Dermatol Venereol 2014; 29:298-306. [DOI: 10.1111/jdv.12530] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 03/21/2014] [Indexed: 11/30/2022]
Affiliation(s)
| | - K. Peris
- Department of Dermatology Catholic University of Rome, Italy
| | - C. Guillen
- Instituto Valenciano de Oncologia Valencia Spain
| | - R. Cerio
- Skin Centre Barts and The London NHS Trust London UK
| | | | - P. Foley
- Department of Medicine (Dermatology) The University of Melbourne St Vincent's Hospital Melbourne and Skin & Cancer Foundation Inc Carlton Australia
| | - J. Sanches
- Universidade de Sao Paulo Sao Paulo Brazil
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Ferreira L, Rebocho S, Oliveira T, Sanches J, Paiva T. Dissociated sleep states in fibromyalgia: Prevalence and correlations. Sleep Med 2013. [DOI: 10.1016/j.sleep.2013.11.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Acharya UR, Faust O, S VS, Alvin APC, Krishnamurthi G, Seabra JCR, Sanches J, Suri JS. Understanding symptomatology of atherosclerotic plaque by image-based tissue characterization. Comput Methods Programs Biomed 2013; 110:66-75. [PMID: 23122720 DOI: 10.1016/j.cmpb.2012.09.008] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 09/07/2012] [Accepted: 09/24/2012] [Indexed: 06/01/2023]
Abstract
Characterization of carotid atherosclerosis and classification into either symptomatic or asymptomatic is crucial in terms of diagnosis and treatment planning for a range of cardiovascular diseases. This paper presents a computer-aided diagnosis (CAD) system (Atheromatic) that analyzes ultrasound images and classifies them into symptomatic and asymptomatic. The classification result is based on a combination of discrete wavelet transform, higher order spectra (HOS) and textural features. In this study, we compare support vector machine (SVM) classifiers with different kernels. The classifier with a radial basis function (RBF) kernel achieved an average accuracy of 91.7% as well as a sensitivity of 97%, and specificity of 80%. Thus, it is evident that the selected features and the classifier combination can efficiently categorize plaques into symptomatic and asymptomatic classes. Moreover, a novel symptomatic asymptomatic carotid index (SACI), which is an integrated index that is based on the significant features, has been proposed in this work. Each analyzed ultrasound image yields on SACI number. A high SACI value indicates that the image shows symptomatic and low value indicates asymptomatic plaques. We hope this SACI can support vascular surgeons during routine screening for asymptomatic plaques.
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Affiliation(s)
- U Rajendra Acharya
- Department of Electrical and Computer Engineering, Ann Polytechnic, Singapore 599489, Singapore
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13
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Khan S, DSouza A, Sanches J, Ventura R. Geometric correction of deformed chromosomes for automatic Karyotyping. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2012:4438-41. [PMID: 23366912 DOI: 10.1109/embc.2012.6346951] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Automatic Karyotyping is the process of classifying chromosomes from an unordered karyogram into their respective classes to create an ordered karyogram. Automatic karyotyping algorithms typically perform geometrical correction of deformed chromosomes for feature extraction; these features are used by classifier algorithms for classifying the chromosomes. Karyograms of bone marrow cells are known to have poor image quality. An example of such karyograms is the Lisbon-K(1) (LK(1)) dataset that is used in our work. Thus, to correct the geometrical deformation of chromosomes from LK(1), a robust method to obtain the medial axis of the chromosome was necessary. To address this problem, we developed an algorithm that uses the seed points to make a primary prediction. Subsequently, the algorithm computes the distance of boundary from the predicted point, and the gradients at algorithm-specified points on the boundary to compute two auxiliary predictions. Primary prediction is then corrected using auxiliary predictions, and a final prediction is obtained to be included in the seed region. A medial axis is obtained this way, which is further used for geometrical correction of the chromosomes. This algorithm was found capable of correcting geometrical deformations in even highly distorted chromosomes with forked ends.
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Affiliation(s)
- Shadab Khan
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.
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14
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Acharya UR, Faust O, Sree SV, Alvin APC, Krishnamurthi G, Seabra JCR, Sanches J, Suri JS. Atheromatic™: symptomatic vs. asymptomatic classification of carotid ultrasound plaque using a combination of HOS, DWT & texture. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:4489-92. [PMID: 22255336 DOI: 10.1109/iembs.2011.6091113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Quantitative characterization of carotid atherosclerosis and classification into either symptomatic or asymptomatic is crucial in terms of diagnosis and treatment planning for a range of cardiovascular diseases. This paper presents a computer-aided diagnosis (CAD) system (Atheromatic™, patented technology from Biomedical Technologies, Inc., CA, USA) which analyzes ultrasound images and classifies them into symptomatic and asymptomatic. The classification result is based on a combination of discrete wavelet transform, higher order spectra and textural features. In this study, we compare support vector machine (SVM) classifiers with different kernels. The classifier with a radial basis function (RBF) kernel achieved an accuracy of 91.7% as well as a sensitivity of 97%, and specificity of 80%. Encouraged by this result, we feel that these features can be used to identify the plaque tissue type. Therefore, we propose an integrated index, a unique number called symptomatic asymptomatic carotid index (SACI) to discriminate symptomatic and asymptomatic carotid ultrasound images. We hope this SACI can be used as an adjunct tool by the vascular surgeons for daily screening.
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Affiliation(s)
- U Rajendra Acharya
- Department of Electrical and Computer Engineering, Ann Polytechnic, Singapore 599489.
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Acharya UR, Sree SV, Ribeiro R, Krishnamurthi G, Marinho RT, Sanches J, Suri JS. Data mining framework for fatty liver disease classification in ultrasound: A hybrid feature extraction paradigm. Med Phys 2012; 39:4255-4264. [DOI: 10.1118/1.4725759] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Faria J, Lima A, Mendes M, Leiria R, Geraldes D, Figueiredo A, Trindade H, Pedro L, Barroso J, Sanches J. EUCALYPTUS FROM MATA EXPERIMENTAL DO ESCAROUPIM (PORTUGAL): EVALUATION OF THE ESSENTIAL OIL COMPOSITION FROM SIXTEEN SPECIES. ACTA ACUST UNITED AC 2011. [DOI: 10.17660/actahortic.2011.925.7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Luiz O, Gianini R, Francisco G, Toledo F, Souza S, Sanches J, Festa-Neto C, Gattas G, Chammas R, Eluf-Neto J. P2-442 European ancestry, phenotypic characteristics and risk of cutaneous melanoma: a case-control study in Sao Paulo, Brazil. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976l.72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Seabra JC, Ciompi F, Pujol O, Mauri J, Radeva P, Sanches J. Rayleigh Mixture Model for Plaque Characterization in Intravascular Ultrasound. IEEE Trans Biomed Eng 2011; 58:1314-24. [DOI: 10.1109/tbme.2011.2106498] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Gafaniz R, Sanches J. ATP consumption and neural electrical activity: a physiological model for brain imaging. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2010:5480-3. [PMID: 21096289 DOI: 10.1109/iembs.2010.5626524] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The relation between neural electrical activity and oxygen consumption is the key issue in almost all brain image modalities based on perfusion. Despite the large amount of physiological information available in the literature about the processes involved in neural activation, a practical, tractable and simultaneously accurate mathematical model to describe this relation is needed.
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Affiliation(s)
- Rita Gafaniz
- Institute for Systems and Robotics at Instituto Superior Técnico, 1049-001 Lisbon, Portugal.
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20
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Abstract
Cytogenetics plays a central role in the detection of chromosomal abnormalities and in the diagnosis of genetic diseases. A karyogram is an image representation of human chromosomes arranged in order of decreasing size and paired in 23 classes. In this paper we propose an approach to automatically pair the chromosomes into a karyogram, using the information obtained in a rough SVM-based classification step, to help the pairing process mainly based on similarity metrics between the chromosomes. Using a set of geometric and band pattern features extracted from the chromosome images, the algorithm is formulated on a Bayesian framework, combining the similarity metric with the results from the classifier. The solution is obtained solving a mixed integer program. Two datasets with contrasting quality levels and 836 chromosomes each were used to test and validate the algorithm. Relevant improvements with respect to the algorithm described by the authors in [1] were obtained with average paring rates above 92%, close to the rates obtained by human operators.
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Affiliation(s)
- Rodrigo Ventura
- Institute for Systems and Robotics at the Instituto Superior Técnico, Lisbon Portugal.
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21
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Abstract
A typical characteristic of images of bone marrow cells taken during mitosis is poor quality. This renders the task of extraction of accurate band profile, representative of intensity distribution over each chromosome, more challenging. A robust method is hence required to tackle this problem. An algorithm was thus developed, which estimates a single-line medial axis, the basis for computation of band profile. Medial axis was generated by computing a final prediction, using primary and secondary predictions obtained by a nonparametric machine learning algorithm trained with data from chromosome's skeleton, and geometrical properties of medial axis, respectively. Experiments were performed using the LK(1) dataset. The algorithm was found capable of estimating a satisfactory single-line medial axis. Band profile obtained was found to be a good representation of intensity levels in different regions of chromosomes. Additionally, this algorithm is robust in terms of growing a very small seed region into desired medial axis and also handling highly irregular chromosomes.
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Affiliation(s)
- Shadab Khan
- Institute for Systems and Robotics, Technical Superior Institute, Lisbon 1049-001, Portugal.
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22
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23
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Rodrigues I, Sanches J. Denoising of LSFCM images with compensation for the photoblinking/photobleaching effects. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2010:4292-4295. [PMID: 21095753 DOI: 10.1109/iembs.2010.5626159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluorescence confocal microscopy images present a low signal to noise ratio and a time intensity decay due to the so called photoblinking and photobleaching effects. These effects, together with the Poisson multiplicative noise that corrupts the images, make long time biological observation processes very difficult.
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Affiliation(s)
- Isabel Rodrigues
- Institute for Systems and Robotics and with Instituto Superior de Engenharia de Lisboa, Portugal.
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24
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Santos N, Sanches J, Figueiredo P. Bayesian optimization of perfusion and transit time estimation in PASL-MRI. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2010:4284-4287. [PMID: 21095751 DOI: 10.1109/iembs.2010.5626174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Pulsed Arterial Spin Labeling (PASL) techniques potentially allow the absolute, non-invasive quantification of brain perfusion and arterial transit time. This can be achieved by fitting a kinetic model to the data acquired at a number of inversion time points (TI). The intrinsically low SNR of PASL data, together with the uncertainty in the model parameters, can hinder the estimation of the parameters of interest. Here, a two-compartment kinetic model is used to estimate perfusion and transit time, based on a Maximum a Posteriori (MAP) criterion. A priori information concerning the physiological variation of the multiple model parameters is used to guide the solution. Monte Carlo simulations are performed to compare the accuracy of our proposed Bayesian estimation method with a conventional Least Squares (LS) approach, using four different sets of TI points. Each set is obtained either with a uniform distribution or an optimal sampling strategy designed based on the same MAP criterion. We show that the estimation errors are minimized when our proposed Bayesian estimation method is employed in combination with an optimal set of sampling points. In conclusion, our results indicate that PASL perfusion and transit time measurements would benefit from a Bayesian approach for the optimization of both the sampling strategy and the estimation algorithm, whereby prior information on the parameters is used.
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Affiliation(s)
- Nuno Santos
- Siemens SA, Healthcare Sector and with Instituto Superior Técnico, Lisboa, Portugal.
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25
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Seabra J, Sanches J. Three-dimensional labeling of vulnerable regions in carotid plaques using Graph-Cuts. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2008:3150-3. [PMID: 19163375 DOI: 10.1109/iembs.2008.4649872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Carotid plaque morphology assessed through high resolution ultrasound is nowadays an important diagnostic approach in the evaluation of stroke risk. The literature describes several methods for the characterization of plaque echogenicity and texture by using overall statistics across the carotid plaques. However, this averaged indicators may not be enough for a correct diagnosis of plaque instability. Therefore, it has been suggested that a local characterization of plaque morphology, where the extension and location of vulnerable regions inside the plaques is taken into account, could lead to significant improvements in the assessment of stroke risk. In this paper, a new method to characterize the morphology of carotid plaques in three-dimensions (3D) is proposed. The local characterization of carotid plaques is performed by using a 3D Graph-Cuts (GraphC) robust labeling method. This methodology allows to binary segment the data by minimizing an energy function that uses spatial correlation among neighboring pixels/voxels in order to remove small misclassified regions. The method is efficient since it is able to find the global minimum of the energy function in a very short time interval. Results show that this labeling procedure is less noisier and favors clustering, being more meaningful from a clinical point of view than the one obtained with simple thresholding. This paper shows that the use of GraphC may improve the 3D morphological characterization of carotid plaques, namely by providing a more appropriate identification of unstable foci inside the plaque.
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Affiliation(s)
- José Seabra
- Systems and Robotics Institute / Instituto Superior Técnico, Lisbon, Portugal.
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Abstract
Cytogenetics is a key tool in the detection of acquired chromosomal abnormalities and in the diagnosis of genetic diseases such as leukemia. The karyotyping is a set of procedures, in the scope of the cytogenetics, that produces a visual representation of the 46 chromosomes (called karyogram), paired and arranged in decreasing order of size. The pairing procedure aims to identify all pairs of homologous chromosomes.The pairing criterion is based on dimensional, morphological,and textural features similarity. This process is time consuming when performed manually, and demanding from a technical point of view. An automatic pairing algorithm would thus bring benefits, but it remains an open problem to date.In this paper a new strategy for automatic pairing of homologous chromosomes is proposed. Besides the traditional features described in the literature, the Mutual Information (MI) is used to discriminate chromosome textural differences. A supervised non-linear classifier is trained by using manual classifications provided by expert technicians, combining the different features computed from each pair.Simulations using 836 real chromosome images, obtained with a Leica Optical Microscope DM 2500, in a leave-one-out cross validation fashion, were performed for training and testing the algorithm.Promising and relevant results were found, despite the poor quality of the original chromosome images, contrasting with state-of the-art algorithms and datasets found in the literature.
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Affiliation(s)
- Artem Khmelinskii
- Institute for Systems and Robotics / Instituto Superior Técnico, 1049-001 Lisbon, Portugal
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Abstract
Image reconstruction from noisy and incomplete observations is usually an ill-posed problem. A Bayesian framework may be adopted do deal with this such inverse task by well posing the reconstruction problem. In this approach, the ill poseness nature of the reconstruction is removed by minimizing a two-term energy function. The first term pushes the solution toward the data and the second regularizes the solution. A Bayesian algorithm for ultrasound image reconstruction and de-noising is proposed where an edge preserving prior is used to reduce the smoothing effect at the transitions. The prior distribution is based on log-Euclidean potential functions that are particular suitable in reconstruction problems under the constraint of positivity, that is, when the unknowns to be estimated should be positive, which is the case, where the noisy observations are modeled by a Rayleigh distribution. In this paper, the reconstruction procedure is formulated as the optimization of a convex function and a Newton method is adopted to obtain the minimizer. This strategy guarantees a convergence to the global minimum in a small number of iterations. Experimental results, using synthetic and real medical images are shown. The proposed method produces images where speckle noise is effectively suppressed and important clinical details (organ and tissue transitions) are preserved.
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Affiliation(s)
- José Seabra
- Systems and Robotics Institute/Instituto Superior Técnico, 1049-001 Lisbon, Portugal.
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Abstract
This paper presents an algorithm for recovering the radio frequency (RF) signal provided by the ultrasound probe from the log-compressed ultrasound images displayed in ultrasound equipment. Commercial ecographs perform nonlinear image compression to reduce the dynamic range of the Ultrasound (US) signal in order to improve image visualization. Moreover, the clinician may adjust other parameters, such as brightness, gain and contrast, to improve image quality of a given anatomical detail. These operations significantly change the statistical distribution of the original RF raw signal, which is assumed, based on physical considerations on the signal formation process, to be Rayleigh distributed. Therefore, the image pixels are no longer Rayleigh distributed and the RF signal is not usually available in the common ultrasound equipment. For statistical data processing purposes, more important than having "good looking" images, it is important to have realistic models to describe the data. In this paper, a nonlinear compression parametric function is used to model the pre-processed image in order to recover the original RF image as well the contrast and brightness parameters. Tests using synthetic and real data and statistical measures such as the Kolmogorov-Smirnov and Kullback-Leibler divergences are used to assess the results. It is shown that the proposed estimation model clearly represents better the observed data than by taking the general assumption of the data being modeled by a Rayleigh distribution.
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Affiliation(s)
- José Seabra
- Systems and Robotics Institute/Instituto Superior Técnico, 1049-001 Lisbon, Portugal.
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Nascimento J, Sanches J. Total variation with automatic hyper-parameter estimation. Annu Int Conf IEEE Eng Med Biol Soc 2008; 2008:443-446. [PMID: 19162688 DOI: 10.1109/iembs.2008.4649185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Medical diagnosis is often hampered by the quality of the images. This happens in a wide range of image modalities. Image noise reduction is a crucial step, however difficult to be accomplished. Bayesian algorithms have been commonly used with success, namely with additive white Gaussian noise (AWGN) model. In fact, the noise corrupting some of the most used medical imaging modalities is not additive neither Gaussian but multiplicative described by Poisson or Rayleigh distributions. This paper proposes a unified framework with automatic hyper parameters estimation. The proposed framework deals with AWGN but also with both Poisson and Rayleigh distributions. The algorithm proposed herein, is based on a maximum a posteriori (MAP) criterion with the edge preserving prior based on the total variation (TV), which avoids the distortion of relevant anatomical details. The denoising technique is performed via single parametric iterative scheme parameterized for each noise model considered. Tests with real data from several medical imaging modalities testify the performance of the algorithm.
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Sanches J, Marques JS, Pinto F, Ferreira PJ. A 3D Ultrasound System for Medical Diagnosis. Pattern Recognition and Image Analysis 2003. [DOI: 10.1007/978-3-540-44871-6_103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Moraes MF, Ventura FA, Araujo C, Tavares NJ, Oliveira CR, Sanches J, Champalimaud JL. [Broncho-splenic fistula caused by hydatidosis]. ACTA MEDICA PORT 1995; 8:451-5. [PMID: 7484259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
To our knowledge, this is the first case report of a broncho-splenic fistula of hydatid origin. We discuss the clinical, radiological and therapeutic aspects of this rare complication of hydatid disease.
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Affiliation(s)
- M F Moraes
- Serviłco de Medicina Interna e Radiologia do Hospital de Egas Moniz, Unidade de Doenças Infecciosas e Parasitárias (UDIP-H.E.M.), Lisboa
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Strecht J, Macedo P, Pereira JL, Sanches J, Afonso AG. [The imaging of acute pancreatitis. The current outlook]. ACTA MEDICA PORT 1995; 8 Suppl 1:S55-61. [PMID: 7653308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- J Strecht
- Serviço de Imagiologia, Hospital de São Francisco Xavier, Lisboa
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Sanches J. [Important landmarks in the diagnosis and treatment of pancreatic disease]. ACTA MEDICA PORT 1995; 8 Suppl 1:S3-4. [PMID: 7653302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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36
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Sanches J. [The centenary of x-rays]. ACTA MEDICA PORT 1995; 8:202-5. [PMID: 7625213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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37
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Strecht J, Amaral I, Pereira JA, Sanches J, Gargaté A. [Imaging of aortic aneurysms and dissections. Part 2. Aortic dissections]. ACTA MEDICA PORT 1993; 6:385-92. [PMID: 8279276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The authors review the main imaging findings of aneurysms and dissections of the aorta. Based on the experience and imaging techniques available in their institution (Conventional Radiology, Sonography and Computed Tomography), they try to make a decision tree of radiologic procedures in ambulatory and emergency patients. Nowadays, in the majority of situations, these techniques allow the Radiologist to make the correct diagnosis, detect the complications and evaluate the patients in the pre and post-surgical phases. Other imaging techniques not available in their institution, such as Magnetic Resonance Imaging and Aortography, will be mentioned in view of their usefulness in some specific situations.
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Affiliation(s)
- J Strecht
- Serviço de Imagiologia do Hospital de S. Francisco Xavier, Lisboa
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Amaral I, Strecht J, Pereira JA, Sanches J, Gargaté A. [Imaging of aneurysms and dissections of the aorta. Part 1--Aneurysms of the abdominal aorta]. ACTA MEDICA PORT 1993; 6:319-25. [PMID: 8379351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The authors review the main imaging findings of aneurysms and dissections of the aorta. Based on the experience and imaging techniques available in their institution (Conventional Radiology, Sonography and Computed Tomography), they try to make a decision tree of radiologic procedures in ambulatory and emergency patients. Nowadays, in the majority of situations, these techniques allow the Radiologist to make the correct diagnosis, detect the complications and evaluate the patients in the pre and post-surgical phases. Other imaging techniques not available in their institution, such as Magnetic Resonance Imaging and Aortography, will be mentioned in view of their usefulness in some specific situations.
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Affiliation(s)
- I Amaral
- Serviço de Imagiologia do Hospital de S. Francisco Xavier, Lisboa
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Abstract
The magnetic resonance (MR) imaging findings of 18 surgically proved posterior fossa hemangioblastomas (15 patients) were retrospectively analyzed and correlated with computed tomographic (ten patients) and angiographic (eight patients) findings. Thirteen tumors were located in the cerebellar hemisphere, three in the vermis, and two in the medulla with associated syrinxes. Three patients had von Hippel-Lindau disease, two of whom had multiple cerebellar hemangioblastomas. Seven hemangioblastomas appeared as solid tumors, six as solid masses with central cysts, and five as cysts with mural nodules. Abnormal tumor vessels, with characteristic signal void, were demonstrated in 13 tumors. Associated hemorrhage was present in four tumors. Although angiography is usually required for the diagnosis and preoperative assessment of this tumor, MR imaging demonstration of a posterior fossa mass with abnormal vessels should suggest the diagnosis of hemangioblastoma. Moreover, the combination of a peripheral posterior fossa cyst with a mural nodule supplied by enlarged vessels may be pathognomonic.
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Affiliation(s)
- S R Lee
- Department of Radiology, Hanyang University, Seoul, Korea
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