Print Email Facebook Twitter PDMS Microlenses for Focusing Light in Narrow Band Imaging Diagnostics Title PDMS Microlenses for Focusing Light in Narrow Band Imaging Diagnostics Author Costa, Adriana C. (University of Minho; Chongqing Technology and Business University) Pimenta, Sara (University of Minho) Ribeiro, João F. (University of Minho) Silva, Manuel F. (University of Minho) Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation) Dong, Tao (Chongqing Technology and Business University; University of South-Eastern Norway) Yang, Zhaochu (Chongqing Technology and Business University) Correia, José H. (University of Minho; Chongqing Technology and Business University) Date 2019 Abstract Minimally invasive medical devices can greatly benefit from Narrow Band Imaging (NBI) diagnostic capabilities, as different wavelengths allow penetration of distinct layers of the gastrointestinal tract mucosa, improving diagnostic accuracy and targeting different pathologies. An important performance parameter is the light intensity at a given power consumption of the medical device. A method to increase the illumination intensity in the NBI diagnostic technique was developed and applied to minimally invasive medical devices (e.g., endoscopic capsules), without increasing the size and power consumption of such instruments. Endoscopic capsules are generally equipped with light-emitting diodes (LEDs) operating in the RGB (red, green, and blue) visible light spectrum. A polydimethylsiloxane (PDMS) µ-lens was designed for a maximum light intensity at the target area of interest when placed on top of the LEDs. The PDMS µ-lens was fabricated using a low-cost hanging droplet method. Experiments reveal an increased illumination intensity by a factor of 1.21 for both the blue and green LEDs and 1.18 for the red LED. These promising results can increase the resolution of NBI in endoscopic capsules, which can contribute to early gastric lesions diagnosis. Subject minimally invasive medical devicesNarrow Band Imaging (NBI)Polydimethylsiloxane (PDMS) µ-lens To reference this document use: http://resolver.tudelft.nl/uuid:0eef3141-4a1d-4bfe-aab2-a3d5cf9bcb64 DOI https://doi.org/10.3390/s19051057 ISSN 1424-8220 Source Sensors, 19 (5), 1-11 Part of collection Institutional Repository Document type journal article Rights © 2019 Adriana C. Costa, Sara Pimenta, João F. Ribeiro, Manuel F. Silva, R.F. Wolffenbuttel, Tao Dong, Zhaochu Yang, José H. Correia Files PDF sensors_19_01057_v2.pdf 2.25 MB Close viewer /islandora/object/uuid:0eef3141-4a1d-4bfe-aab2-a3d5cf9bcb64/datastream/OBJ/view