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dc.contributor.authorPimenta, Sarapor
dc.contributor.authorCarmo, João Paulo Pereirapor
dc.contributor.authorCorreia, R. G.por
dc.contributor.authorMinas, Graçapor
dc.contributor.authorCastanheira, Elisabete M. S.por
dc.identifier.citationPimenta, S., Carmo, J. P., Correia, R. G., Minas, G., & Castanheira, E. M. S. (2015). Characterization of silicon photodiodes for diffuse reflectance signal extraction. Paper presented at the Proceedings - 2015 IEEE 4th Portuguese Meeting on Bioengineering, ENBENG 2015.por
dc.description.abstractEarly detection of gastrointestinal (GI) can cers is one of most important concerns in medical field. Its detection at the earliest stage is crucial to increase the patient survival chances. Optical signals extraction and analysis, specifically diffuse reflectance and intrinsic fluorescence, may impr ove the ability to detect GI dysplasia, once some morphological and biochemical changes on the tissues (related with early cancer progre ssion) can modify these signals’ shape and intensity. The project under th is paper aims to develop a chip - sized spectros copy microsystem for the early detection of GI cancer. This paper presents the characterization of silicon photodiodes (n+/p - epilayer type) fabricated in a standard 0.7 μm CMOS process, with different dimensions. The main goal is to conclude which photodio de must be fabricated for the microsystem implementation, taking into account its capacity to extract the signals in the relevant spectral band (350 nm – 750 nm), not comprising the microsystem dimensions. With this study , it can be conclude d that the suit able photodiodes for the detection of those spectroscopic signals are the ones with 125 × 125 μm 2 or 100 × 100 μm 2 active area , once their quantum efficiency varies between 20% and 55%, approximately, above 450 nm. In spite of the low photodiod es quantum efficiency (lower than 20%) below 450 nm, the viability of using the 100 × 100 μm 2 photodiode to extract the diffuse reflectance signal, between 350 nm and 750 nm, was proven using a test phantom representative of a GI tissue.por
dc.description.sponsorshipThis work is funded by FEDER funds through the "Eixo I do Programa Operacional Fatores de Competitividade (POFC) QREN, projects reference COMPETE: FCOMP-01-0124-FEDER-020241 and FCOMP-01-124-FEDER-037291 (PEst-C/FIS/UI0607/2013) and by FCT – Fundação para a Ciência e a Tecnologia, project reference PTDC/EBB-EBI/120334/2010. S. Pimenta thanks the FCT for the SFRH/BD/87605/2012 PhD grant.por
dc.subjectGastrointestinal cancerpor
dc.subjectGI cancer detectionpor
dc.subjectSpectroscopic signals extractionpor
dc.subjectOn chip integrationpor
dc.subjectPhotodiodes characterizationpor
dc.subjectQuantum efficiencypor
dc.titleCharacterization of silicon photodiodes for diffuse reflectance signal extractionpor
oaire.citationTitleProceedings of 2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)por
dc.subject.fosEngenharia e Tecnologia::Engenharia Médicapor
dc.subject.wosScience & Technologypor
sdum.conferencePublicationProceedings of 2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)por
Appears in Collections:CDF - FAMO - Comunicações/Communications (with refereeing)
DEI - Artigos em atas de congressos internacionais

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