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Grygoryev K, Lu H, Sørensen S, Talebi Varnosfaderani O, Georgel R, Li L, Burke R, Andersson-Engels S. Miniature, multi-dichroic instrument for measuring the concentration of multiple fluorophores. BIOMEDICAL OPTICS EXPRESS 2024; 15:2377-2391. [PMID: 38633072 PMCID: PMC11019676 DOI: 10.1364/boe.516574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/05/2024] [Accepted: 03/06/2024] [Indexed: 04/19/2024]
Abstract
Identification of tumour margins during resection of the brain is critical for improving the post-operative outcomes. Due to the highly infiltrative nature of glioblastoma multiforme (GBM) and limited intraoperative visualization of the tumour margin, incomplete surgical resection has been observed to occur in up to 80 % of GBM cases, leading to nearly universal tumour recurrence and overall poor prognosis of 14.6 months median survival. This research presents a miniaturized, SiPMT-based optical system for simultaneous measurement of powerful DRS and weak auto-fluorescence for brain tumour detection. The miniaturisation of the optical elements confined the spatial separation of eight select wavelengths into footprint measuring 1.5 × 2 × 16 mm. The small footprint enables this technology to be integrated with existing surgical guidance instruments in the operating room. It's dynamic ability to subtract any background illumination and measure signal intensities across a broad range from pW to mWs make this design much more suitable for clinical environments as compared to spectrometer-based systems with limited dynamic ranges and high integration times. Measurements using optical tissue phantoms containing mixed fluorophores demonstrate correlation coefficients between the fitted response and actual concentration using PLS regression being 0.95, 0.87 and 0.97 for NADH, FAD and PpIX , respectively. These promising results indicate that our proposed miniaturized instrument could serve as an effective alternative in operating rooms, assisting surgeons in identifying brain tumours to achieving positive surgical outcomes for patients.
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Affiliation(s)
| | - Huihui Lu
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
| | - Simon Sørensen
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
| | | | - Rachel Georgel
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
| | - Liyao Li
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
| | - Ray Burke
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
| | - Stefan Andersson-Engels
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, Cork, Ireland
- Department of Physics, University College Cork, College Road, Cork, Ireland
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2
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Månefjord H, Li M, Brackmann C, Reistad N, Runemark A, Rota J, Anderson B, Zoueu JT, Merdasa A, Brydegaard M. A biophotonic platform for quantitative analysis in the spatial, spectral, polarimetric, and goniometric domains. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:113709. [PMID: 36461456 DOI: 10.1063/5.0095133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 10/21/2022] [Indexed: 06/17/2023]
Abstract
Advanced instrumentation and versatile setups are needed for understanding light interaction with biological targets. Such instruments include (1) microscopes and 3D scanners for detailed spatial analysis, (2) spectral instruments for deducing molecular composition, (3) polarimeters for assessing structural properties, and (4) goniometers probing the scattering phase function of, e.g., tissue slabs. While a large selection of commercial biophotonic instruments and laboratory equipment are available, they are often bulky and expensive. Therefore, they remain inaccessible for secondary education, hobbyists, and research groups in low-income countries. This lack of equipment impedes hands-on proficiency with basic biophotonic principles and the ability to solve local problems with applied physics. We have designed, prototyped, and evaluated the low-cost Biophotonics, Imaging, Optical, Spectral, Polarimetric, Angular, and Compact Equipment (BIOSPACE) for high-quality quantitative analysis. BIOSPACE uses multiplexed light-emitting diodes with emission wavelengths from ultraviolet to near-infrared, captured by a synchronized camera. The angles of the light source, the target, and the polarization filters are automated by low-cost mechanics and a microcomputer. This enables multi-dimensional scatter analysis of centimeter-sized biological targets. We present the construction, calibration, and evaluation of BIOSPACE. The diverse functions of BIOSPACE include small animal spectral imaging, measuring the nanometer thickness of a bark-beetle wing, acquiring the scattering phase function of a blood smear and estimating the anisotropic scattering and the extinction coefficients, and contrasting muscle fibers using polarization. We provide blueprints, component list, and software for replication by enthusiasts and educators to simplify the hands-on investigation of fundamental optical properties in biological samples.
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Affiliation(s)
- Hampus Månefjord
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
| | - Meng Li
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
| | - Christian Brackmann
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
| | - Nina Reistad
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
| | - Anna Runemark
- Department of Biology, Lund University, Sölvegatan 35, SE-223 63 Lund, Sweden
| | - Jadranka Rota
- Biological Museum, Department of Biology, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden
| | | | - Jeremie T Zoueu
- Laboratoire d'Instrumentation, Image et Spectroscopie, INP-HB, BP 1093 Yamoussoukro, Côte d'Ivoire
| | - Aboma Merdasa
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
| | - Mikkel Brydegaard
- Department of Physics, Lund University, Sölvegatan 14, SE-223 62 Lund, Sweden
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Use of Multispectral Microscopy in the Prediction of Coated Halftone Reflectance. J Imaging 2022; 8:jimaging8090243. [PMID: 36135408 PMCID: PMC9504082 DOI: 10.3390/jimaging8090243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/24/2022] [Accepted: 09/03/2022] [Indexed: 11/16/2022] Open
Abstract
When a print is coated with a transparent layer, such as a lamination film or a varnish layer, its color can be modified compared to the uncoated version due to multiple reflections between the layer-air interface and the inked substrate. These interreflections involve a multiple-convolution process between the halftone pattern and a ring-shaped luminous halo. They are described by an optical model which we have developed. The challenge at stake is to observe the impact of the coated layer on the print spectral reflectances and see if it can be predicted. The approach is based on pictures of the print captured with a multispectral microscope that are processed through the optical model to predict the spectral pictures of the coated print. The pictures averaged on the spatial dimension led to spectral reflectances which can be compared with macroscale measurements performed with a spectrophotometer. Comparison between macroscale measurements and microscale measurements with a multispectral microscope being delicate, specific care has been taken to calibrate the instruments. This method resulted in fairly conclusive predictions, both at the macroscale with the spectral reflectances, and at the microscale with an accurate prediction of the blurring effect induced by the multi-convolutive optical process. The tests carried out showed that the optical and visual effect of a coating layer on single-ink or multi-ink halftones with various patterns can be predicted with a satisfactory accuracy. Hence, by measuring the spatio-spectral reflectance of the uncoated print and predicting the spatio-spectral reflectance of the coating print, we can predict the color changes due to the coating itself. The model could be included in color management workflows for printing applications including a finishing coating.
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Cavalcanti TC, Kim S, Lee K, Lee SY, Park MK, Hwang JY. Smartphone-based spectral imaging otoscope: System development and preliminary study for evaluation of its potential as a mobile diagnostic tool. JOURNAL OF BIOPHOTONICS 2020; 13:e2452. [PMID: 32141237 DOI: 10.1002/jbio.201960213] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/30/2020] [Accepted: 02/29/2020] [Indexed: 05/28/2023]
Abstract
We develop a novel smartphone-based spectral imaging otoscope for telemedicine and examine its capability for the mobile diagnosis of middle ear diseases. The device was applied to perform spectral imaging and analysis of an ear-mimicking phantom and a normal and abnormal tympanic membrane for evaluation of its potential for the mobile diagnosis. Spectral classified images were obtained via online spectral analysis in a remote server. The phantom experimental results showed that it allowed us to distinguish four different fluids located behind a semitransparent membrane. Also, in the spectral classified images of normal ears (n = 3) and an ear with chronic otitis media (n = 1), the normal and abnormal regions in each ear could be quantitatively distinguished with high contrast. These preliminary results thus suggested that it might have the potentials for providing quantitative information for the mobile diagnosis of various middle ear diseases.
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Affiliation(s)
- Thiago C Cavalcanti
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Sewoong Kim
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Kyungsu Lee
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Moo Kyun Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
- Sensory Organ Research Institute, Seoul National University Medical Research Center, Seongnam, South Korea
| | - Jae Youn Hwang
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
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Optical Design of an LED Lighting Source for Fluorescence Microscopes. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9214574] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this study, we reveal an LED light source model applied in fluorescence microscopes. This optical model is composed of a confocal total internal reflection lens array system (CTLAS) with a nine-LED array. The CTLAS optical system that we designed consists of a total internal reflection (TIR) lens array and a confocal system. The electrical power of the nine-LED array is 7.9 watts, which is lower than traditional light sources, such as the original 120-watt halogen lamps used in fluorescence microscopes (Zeiss, Axio Imager 2). We have successfully applied the CTLAS system to an Axio Imager 2 fluorescence microscope to observe the vascular bundle organization, modified with Cy3 fluorescence molecules, and have found that in the process of system assembly, the fabrication errors of optical lenses could have a critical effect on the CTLAS system. The results of our experiment show that, in order to achieve the same illuminance as that of the halogen lamp, the displacement error tolerances of the lateral x-axis and the longitudinal z-axis must be controlled within 1.3 mm and 1.7 mm, respectively.
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Gordon P, Venancio VP, Mertens-Talcott SU, Coté G. Portable bright-field, fluorescence, and cross-polarized microscope toward point-of-care imaging diagnostics. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-8. [PMID: 31564071 PMCID: PMC6997630 DOI: 10.1117/1.jbo.24.9.096502] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 09/04/2019] [Indexed: 05/16/2023]
Abstract
Emerging technologies are enabling the feasibility of new types of point-of-care diagnostic devices. A portable, multimodal microscopy platform intended for use in remote diagnostic applications is presented. Use of such a system could bring high-quality microscopy to field use for diseases such as malaria, allowing better diagnostic and surveillance information to be gathered. The microscope was designed using off-the-shelf components and a manual filter selection to generate bright-field, fluorescent, and cross-polarized images of samples mounted to microscopy slides. Design parameters for the system are discussed, and characterization is performed using standardized imaging targets, multimodal phantoms, and blood smears simulating those used in malaria diagnosis. The microscope is shown to be able to image below element 9-3 of a 1951 U.S. Air Force target, indicating that the system is capable of resolving features < 775 nm. Morphological indicators of Plasmodium falciparum can be visualized in images from each modality and combined into high-contrast composite images. To optimize parasitic feature contrast across all three imaging modes, several different staining techniques were compared, with results indicating that use of a single nucleic acid binding fluorophore is preferable.
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Affiliation(s)
- Paul Gordon
- Texas A&M University, Department of Biomedical Engineering, Optical Biosensing Laboratory, College Station, Texas, United States
| | - Vinicius Paula Venancio
- Texas A&M University, Department of Nutrition and Food Science, College Station, Texas, United States
| | | | - Gerard Coté
- Texas A&M University, Department of Biomedical Engineering, Optical Biosensing Laboratory, College Station, Texas, United States
- Texas A&M Engineering Experiment Station, Center for Remote Health Technologies and Systems, College Station, Texas, United States
- Address all correspondence to Gerard Coté, E-mail:
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Agnero MA, Konan K, Tokou ZGCS, Kossonou YTA, Dion BS, Kaduki KA, Zoueu JT. Malaria-Infected Red Blood Cell Analysis through Optical and Biochemical Parameters Using the Transport of Intensity Equation and the Microscope's Optical Properties. SENSORS (BASEL, SWITZERLAND) 2019; 19:E3045. [PMID: 31295927 PMCID: PMC6678084 DOI: 10.3390/s19143045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/07/2019] [Accepted: 06/09/2019] [Indexed: 11/16/2022]
Abstract
The accuracy, reliability, speed and cost of the methods used for malaria diagnosis are key to the diseases' treatment and eventual eradication. However, improvement in any one of these requirements can lead to deterioration of the rest due to their interdependence. We propose an optical method that provides fast detection of malaria-infected red blood cells (RBCs) at a lower cost. The method is based on the combination of deconvolution, topography and three-dimensional (3D) refractive index reconstruction of the malaria-infected RBCs by use of the transport of intensity equation. Using our method, healthy RBCs were identified by their biconcave shape, quasi-uniform spatial distribution of their refractive indices and quasi-uniform concentration of hemoglobin. The values of these optical and biochemical parameters were found to be in agreement with the values reported in the literature. Results for the malaria-infected RBCs were significantly different from those of the healthy RBCs. The topography of the cells and their optical and biochemical parameters enabled identification of their stages of infection. This work introduces a significant method of analyzing malaria-infected RBCs at a lower cost and without the use of fluorescent labels for the parasites.
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Affiliation(s)
- Marcel Akpa Agnero
- Laboratoire de Physique de la Matière Condensée et Technologie, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d'Ivoire.
| | - Kouakou Konan
- Laboratoire d'Instrumentation d'Image et Spectroscopie, Institut National Polytechnique Félix Houphouët-Boigny (INPH-B), BP 1093 Yamoussoukro, Côte d'Ivoire
| | | | - Yao Taky Alvarez Kossonou
- Laboratoire d'Instrumentation d'Image et Spectroscopie, Institut National Polytechnique Félix Houphouët-Boigny (INPH-B), BP 1093 Yamoussoukro, Côte d'Ivoire
| | - Bienvenue Sylvère Dion
- Laboratoire d'Instrumentation d'Image et Spectroscopie, Institut National Polytechnique Félix Houphouët-Boigny (INPH-B), BP 1093 Yamoussoukro, Côte d'Ivoire
| | | | - Jérémie Thouakesséh Zoueu
- Laboratoire d'Instrumentation d'Image et Spectroscopie, Institut National Polytechnique Félix Houphouët-Boigny (INPH-B), BP 1093 Yamoussoukro, Côte d'Ivoire
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8
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Mendoza-Yero O, Carbonell-Leal M, Lancis J, Garcia-Sucerquia J. Second-harmonic illumination to enhance multispectral digital lensless holographic microscopy. OPTICS LETTERS 2016; 41:1062-1065. [PMID: 26974116 DOI: 10.1364/ol.41.001062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Multispectral digital lensless holographic microscopy (MDLHM) operating with second-harmonic illumination is shown. Added to the improvement of the spatial resolution of the previously reported MDLHM operating with near-infrared illumination, this second-harmonic MDLHM shows promise as a tool to study the behavior of biological samples under a broad spectral illumination. This illumination is generated by focusing a highly spatially coherent ultrashort pulsed radiation into an uncoated Type 1 β-BaB2O4 (BBO) nonlinear crystal. The second-harmonic MDLHM allows achieving multispectral images of biological samples with enhanced micrometer spatial resolution. The illumination wavelength of the second-harmonic MDLHM can be tuned by displacing a focusing optics with respect to a pinhole; spatially resolved information at different wavelengths of the sample can then be retrieved.
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Brydegaard M, Merdasa A, Gebru A, Jayaweera H, Svanberg S. Realistic Instrumentation Platform for Active and Passive Optical Remote Sensing. APPLIED SPECTROSCOPY 2016; 70:372-385. [PMID: 26772187 DOI: 10.1177/0003702815620564] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 06/22/2015] [Indexed: 06/05/2023]
Abstract
We describe the development of a novel versatile optical platform for active and passive remote sensing of environmental parameters. Applications include assessment of vegetation status and water quality. The system is also adapted for ecological studies, such as identification of flying insects including agricultural pests. The system is based on two mid-size amateur astronomy telescopes, continuous-wave diode lasers at different wavelengths ranging from violet to the near infrared, and detector facilities including quadrant photodiodes, two-dimensional and line scan charge-coupled device cameras, and a compact digital spectrometer. Application examples include remote Ramanlaser-induced fluorescence monitoring of water quality at 120 m distance, and insect identification at kilometer ranges using the recorded wing beat frequency and its spectrum of overtones. Because of the low cost this developmental platform is very suitable for advanced research projects in developing countries and has, in fact, been multiplied during hands-on workshops and is now being used by a number of groups at African universities.
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Affiliation(s)
- Mikkel Brydegaard
- Lund Laser Center, Department of Physics, Lund University, Lund, Sweden Laser Research Institute, Department of Physics, Stellenbosch University, Matieland, South Africa Center for Animal Movement Research, Department of Biology, Lund University, Lund, Sweden
| | - Aboma Merdasa
- Lund Laser Center, Department of Physics, Lund University, Lund, Sweden
| | - Alem Gebru
- Lund Laser Center, Department of Physics, Lund University, Lund, Sweden Laser Research Institute, Department of Physics, Stellenbosch University, Matieland, South Africa
| | - Hiran Jayaweera
- Lund Laser Center, Department of Physics, Lund University, Lund, Sweden Department of Physics, University of Colombo, Colombo, Sri Lanka
| | - Sune Svanberg
- Lund Laser Center, Department of Physics, Lund University, Lund, Sweden Center of Optical and Electromagnetic Research, South China Normal University, Guangzhou, China
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Xie H, Xie Z, Mousavi M, Bendsoe N, Brydegaard M, Axelsson J, Andersson-Engels S. Design and validation of a fiber optic point probe instrument for therapy guidance and monitoring. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:71408. [PMID: 24623193 DOI: 10.1117/1.jbo.19.7.071408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 02/11/2014] [Indexed: 05/21/2023]
Abstract
Optical techniques for tissue diagnostics currently are experiencing tremendous growth in biomedical applications, mainly due to their noninvasive, inexpensive, and real-time functionality. Here, we demonstrate a hand-held fiber optic probe instrument based on fluorescence/reflectance spectroscopy for precise tumor delineation. It is mainly aimed for brain tumor resection guidance with clinical adaptation to minimize the disruption of the standard surgical workflow and is meant as a complement to the state-of-the-art fluorescence surgical microscopy technique. Multiple light sources with fast pulse modulation and detection enable precise quantification of protoporphyrin IX (PpIX), tissue optical properties, and ambient light suppression. Laboratory measurements show the system is insensitive to strong ambient light. Validation measurements of tissue phantoms using nonlinear least squares support vector machines (LS-SVM) regression analysis demonstrate an error of <5% for PpIX concentration ranging from 400 to 1000 nM, even in the presence of large variations in phantom optical properties. The mean error is 3% for reduced scattering coefficient and 5% for blood concentration. Diagnostic precision of 100% was obtained by LS-SVM classification for in vivo skin tumors with topically applied 5-aminolevulinic acid during photodynamic therapy. The probe could easily be generalized to other tissue types and fluorophores for therapy guidance and monitoring.
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Affiliation(s)
- Haiyan Xie
- Lund University, Department of Physics, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Zhiyuan Xie
- Lund University, Department of Physics, P.O. Box 118, SE-221 00 Lund, Sweden
| | | | - Niels Bendsoe
- Skåne University Hospital, Department of Dermatology and Venereology, Lasarettsgatan 15, SE-221 85 Lund, Sweden
| | - Mikkel Brydegaard
- Lund University, Department of Physics, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Johan Axelsson
- Lund University, Department of Physics, P.O. Box 118, SE-221 00 Lund, Sweden
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Herrera-Ramírez J, Vilaseca M, Pujol J. Portable multispectral imaging system based on light-emitting diodes for spectral recovery from 370 to 1630 nm. APPLIED OPTICS 2014; 53:3131-3141. [PMID: 24922036 DOI: 10.1364/ao.53.003131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/14/2014] [Indexed: 06/03/2023]
Abstract
To expand and investigate the potential of spectral imaging, we developed a portable multispectral system using light-emitting diodes. This system recovers spectral information from the UV to the near IR over a large area using two different image sensors synchronized with 23 bands of illumination. The system was assessed for spectral reconstruction through simulations and experimental measurements by means of two methods of spectral reconstruction and three different evaluation metrics. The results over a Macbeth ColorChecker chart and other samples, including pigments usually employed in art paintings, are compared and discussed. The portable multispectral system using LEDs constitutes a cost-effective and versatile method for spectral imaging.
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Brydegaard M, Samuelsson P, Kudenov MW, Svanberg S. On the exploitation of mid-infrared iridescence of plumage for remote classification of nocturnal migrating birds. APPLIED SPECTROSCOPY 2013; 67:477-490. [PMID: 23643036 DOI: 10.1366/12-06860] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A challenging task in ornithology lies in identifying high-altitude nocturnal migrating bird species and genders. While the current approaches including radar, lunar obscuration, and single-band thermal imaging provide means of detection, a more detailed spectral or polarimetric analysis of light has the potential for retrieval of additional information whereby the species and sex could be determined. In this paper, we explore remote classification opportunities provided by iridescent features within feathers in the mid-infrared region. Our approach first involves characterizing the microstructural features of the feather by using rotation and straining, and a scheme for their remote detection is proposed by correlating these microstructural changes to spectral and polarimetric effects. Furthermore, we simulate the spectral signature of the entire bird by using a model that demonstrates how classification would be achieved. Finally, we apply infrared hyperspectral polarization imaging, showing that the net iridescent effect persists for the bird as a whole.
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Affiliation(s)
- Mikkel Brydegaard
- Atomic Physics Division, Lund University, P.O. Box 118, 221 00 Lund, Sweden.
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Dabo-Niang S, Zoueu JT. Combining kriging, multispectral and multimodal microscopy to resolve malaria-infected erythrocyte contents. J Microsc 2013; 247:240-51. [PMID: 22906011 DOI: 10.1111/j.1365-2818.2012.03637.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this communication, we demonstrate how kriging, combine with multispectral and multimodal microscopy can enhance the resolution of malaria-infected images and provide more details on their composition, for analysis and diagnosis. The results of this interpolation applied to the two principal components of multispectral and multimodal images illustrate that the examination of the content of Plasmodium falciparum infected human erythrocyte is improved.
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Affiliation(s)
- S Dabo-Niang
- Laboratoire EQUIPPE, Université Charles De Gaulle, Lille 3, Maison de la Recherche, Domaine du Pont de Bois, BP 60149, 59653 Villeneuve d'Ascq Cedex, France
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