1
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Picart T, Gautheron A, Caredda C, Ray C, Mahieu-Williame L, Montcel B, Guyotat J. Fluorescence-Guided Surgical Techniques in Adult Diffuse Low-Grade Gliomas: State-of-the-Art and Emerging Techniques: A Systematic Review. Cancers (Basel) 2024; 16:2698. [PMID: 39123426 PMCID: PMC11311317 DOI: 10.3390/cancers16152698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Revised: 07/26/2024] [Accepted: 07/28/2024] [Indexed: 08/12/2024] Open
Abstract
Diffuse low-grade gliomas are infiltrative tumors whose margins are not distinguishable from the adjacent healthy brain parenchyma. The aim was to precisely examine the results provided by the intraoperative use of macroscopic fluorescence in diffuse low-grade gliomas and to describe the new fluorescence-based techniques capable of guiding the resection of low-grade gliomas. Only about 20% and 50% of low-grade gliomas are macroscopically fluorescent after 5-amino-levulinic acid (5-ALA) or fluorescein sodium intake, respectively. However, 5-ALA is helpful for detecting anaplastic foci, and thus choosing the best biopsy targets in diffuse gliomas. Spectroscopic detection of 5-ALA-induced fluorescence can detect very low and non-macroscopically visible concentrations of protoporphyrin IX, a 5-ALA metabolite, and, consequently, has excellent performances for the detection of low-grade gliomas. Moreover, these tumors have a specific spectroscopic signature with two fluorescence emission peaks, which is useful for distinguishing them not only from healthy brain but also from high-grade gliomas. Confocal laser endomicroscopy can generate intraoperative optic biopsies, but its sensitivity remains limited. In the future, the coupled measurement of autofluorescence and induced fluorescence, and the introduction of fluorescence detection technologies providing a wider field of view could result in the development of operator-friendly tools implementable in the operative routine.
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Affiliation(s)
- Thiebaud Picart
- Department of Neurosurgery, Hôpital Neurologique Pierre Wertheimer, Groupe Hospitalier Est, Hospices Civils de Lyon, 59 Boulevard Pinel, 69500 Bron, France
- Faculty of Medicine Lyon Est, Université Claude Bernard Lyon 1, 8 Avenue Rockefeller, 69003 Lyon, France
- Cancer Research Centre of Lyon (CRCL) Inserm 1052, CNRS 5286, 28 Rue Laennec, 69008 Lyon, France
| | - Arthur Gautheron
- Laboratoire Hubert Curien UMR 5516, Institut d’Optique Graduate School, CNRS, Université Jean Monnet Saint-Etienne, 42023 Saint-Etienne, France;
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
| | - Charly Caredda
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
| | - Cédric Ray
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
| | - Laurent Mahieu-Williame
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
| | - Bruno Montcel
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
| | - Jacques Guyotat
- Department of Neurosurgery, Hôpital Neurologique Pierre Wertheimer, Groupe Hospitalier Est, Hospices Civils de Lyon, 59 Boulevard Pinel, 69500 Bron, France
- Faculty of Medicine Lyon Est, Université Claude Bernard Lyon 1, 8 Avenue Rockefeller, 69003 Lyon, France
- CREATIS CNRS, Inserm, UMR 5220, U1294, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, 69100 Lyon, France; (C.C.); (C.R.); (L.M.-W.); (B.M.)
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2
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Saha PS, Yan J, Zhu C. Diffuse reflectance spectroscopy for optical characterizations of orthotopic head and neck cancer models in vivo. BIOMEDICAL OPTICS EXPRESS 2024; 15:4176-4189. [PMID: 39022549 PMCID: PMC11249676 DOI: 10.1364/boe.528608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 07/20/2024]
Abstract
We demonstrated an easy-to-build, portable diffuse reflectance spectroscopy device along with a Monte Carlo inverse model to quantify tissue absorption and scattering-based parameters of orthotopic head and neck cancer models in vivo. Both tissue-mimicking phantom studies and animal studies were conducted to verify the optical spectroscopy system and Monte Carlo inverse model for the accurate extraction of tissue optical properties. For the first time, we reported the tissue absorption and scattering coefficients of mouse normal tongue tissues and tongue tumor tissues. Our in vivo animal studies showed reduced total hemoglobin concentration, lower tissue vascular oxygen saturation, and increased tissue scattering in the orthotopic tongue tumors compared to the normal tongue tissues. Our data also showed that mice tongue tumors with different sizes may have significantly different tissue absorption and scattering-based parameters. Small tongue tumors (volume was ∼60 mm3) had increased absorption coefficients, decreased reduced-scattering coefficients, and increased total hemoglobin concentrations compared to tiny tongue tumors (volume was ∼18 mm3). These results demonstrated the potential of diffuse reflectance spectroscopy to noninvasively evaluate tumor biology using orthotopic tongue cancer models for future head and neck cancer research.
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Affiliation(s)
- Pranto Soumik Saha
- Department of Biomedical Engineering, University of Kentucky
, Lexington, KY 40506, USA
| | - Jing Yan
- Department of Biomedical Engineering, University of Kentucky
, Lexington, KY 40506, USA
| | - Caigang Zhu
- Department of Biomedical Engineering, University of Kentucky
, Lexington, KY 40506, USA
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3
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Matthies L, Amir-Kabirian H, Gebrekidan MT, Braeuer AS, Speth US, Smeets R, Hagel C, Gosau M, Knipfer C, Friedrich RE. Raman difference spectroscopy and U-Net convolutional neural network for molecular analysis of cutaneous neurofibroma. PLoS One 2024; 19:e0302017. [PMID: 38603731 PMCID: PMC11008861 DOI: 10.1371/journal.pone.0302017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 03/26/2024] [Indexed: 04/13/2024] Open
Abstract
In Neurofibromatosis type 1 (NF1), peripheral nerve sheaths tumors are common, with cutaneous neurofibromas resulting in significant aesthetic, painful and functional problems requiring surgical removal. To date, determination of adequate surgical resection margins-complete tumor removal while attempting to preserve viable tissue-remains largely subjective. Thus, residual tumor extension beyond surgical margins or recurrence of the disease may frequently be observed. Here, we introduce Shifted-Excitation Raman Spectroscopy in combination with deep neural networks for the future perspective of objective, real-time diagnosis, and guided surgical ablation. The obtained results are validated through established histological methods. In this study, we evaluated the discrimination between cutaneous neurofibroma (n = 9) and adjacent physiological tissues (n = 25) in 34 surgical pathological specimens ex vivo at a total of 82 distinct measurement loci. Based on a convolutional neural network (U-Net), the mean raw Raman spectra (n = 8,200) were processed and refined, and afterwards the spectral peaks were assigned to their respective molecular origin. Principal component and linear discriminant analysis was used to discriminate cutaneous neurofibromas from physiological tissues with a sensitivity of 100%, specificity of 97.3%, and overall classification accuracy of 97.6%. The results enable the presented optical, non-invasive technique in combination with artificial intelligence as a promising candidate to ameliorate both, diagnosis and treatment of patients affected by cutaneous neurofibroma and NF1.
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Affiliation(s)
- Levi Matthies
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Mildred Scheel Cancer Career Center HaTriCS4, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hendrik Amir-Kabirian
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Medhanie T. Gebrekidan
- Institute of Thermal-, Environmental- and Resources‘ Process Engineering, Technische Universität Bergakademie Freiberg, Freiberg, Germany
| | - Andreas S. Braeuer
- Institute of Thermal-, Environmental- and Resources‘ Process Engineering, Technische Universität Bergakademie Freiberg, Freiberg, Germany
| | - Ulrike S. Speth
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Division of “Regenerative Orofacial Medicine”, Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Hagel
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Martin Gosau
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Knipfer
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Reinhard E. Friedrich
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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4
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Ndabakuranye JP, Belcourt J, Sharma D, O'Connell CD, Mondal V, Srivastava SK, Stacey A, Long S, Fleiss B, Ahnood A. Miniature fluorescence sensor for quantitative detection of brain tumour. LAB ON A CHIP 2024; 24:946-954. [PMID: 38275166 DOI: 10.1039/d3lc00982c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Fluorescence-guided surgery has emerged as a vital tool for tumour resection procedures. As well as intraoperative tumour visualisation, 5-ALA-induced PpIX provides an avenue for quantitative tumour identification based on ratiometric fluorescence measurement. To this end, fluorescence imaging and fibre-based probes have enabled more precise demarcation between the cancerous and healthy tissues. These sensing approaches, which rely on collecting the fluorescence light from the tumour resection site and its "remote" spectral sensing, introduce challenges associated with optical losses. In this work, we demonstrate the viability of tumour detection at the resection site using a miniature fluorescence measurement system. Unlike the current bulky systems, which necessitate remote measurement, we have adopted a millimetre-sized spectral sensor chip for quantitative fluorescence measurements. A reliable measurement at the resection site requires a stable optical window between the tissue and the optoelectronic system. This is achieved using an antifouling diamond window, which provides stable optical transparency. The system achieved a sensitivity of 92.3% and specificity of 98.3% in detecting a surrogate tumour at a resolution of 1 × 1 mm2. As well as addressing losses associated with collecting and coupling fluorescence light in the current 'remote' sensing approaches, the small size of the system introduced in this work paves the way for its direct integration with the tumour resection tools with the aim of more accurate interoperative tumour identification.
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Affiliation(s)
| | | | - Deepak Sharma
- School of Engineering, RMIT University, VIC 3000, Australia.
- Photovoltaic Metrology Section, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Cathal D O'Connell
- School of Engineering, RMIT University, VIC 3000, Australia.
- Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, VIC 3065, Australia
| | - Victor Mondal
- School of Health and Biomedical Sciences, RMIT University, VIC 3000, Australia
| | - Sanjay K Srivastava
- Photovoltaic Metrology Section, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Alastair Stacey
- School of Science, RMIT University, VIC 3000, Australia
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - Sam Long
- Veterinary Referral Hospital, Victoria, Australia
| | - Bobbi Fleiss
- School of Health and Biomedical Sciences, RMIT University, VIC 3000, Australia
| | - Arman Ahnood
- School of Engineering, RMIT University, VIC 3000, Australia.
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5
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Kaynar G, Cakmakci D, Bund C, Todeschi J, Namer IJ, Cicek AE. PiDeeL: metabolic pathway-informed deep learning model for survival analysis and pathological classification of gliomas. Bioinformatics 2023; 39:btad684. [PMID: 37952175 PMCID: PMC10663986 DOI: 10.1093/bioinformatics/btad684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/19/2023] [Accepted: 11/10/2023] [Indexed: 11/14/2023] Open
Abstract
MOTIVATION Online assessment of tumor characteristics during surgery is important and has the potential to establish an intra-operative surgeon feedback mechanism. With the availability of such feedback, surgeons could decide to be more liberal or conservative regarding the resection of the tumor. While there are methods to perform metabolomics-based tumor pathology prediction, their model complexity predictive performance is limited by the small dataset sizes. Furthermore, the information conveyed by the feedback provided on the tumor tissue could be improved both in terms of content and accuracy. RESULTS In this study, we propose a metabolic pathway-informed deep learning model (PiDeeL) to perform survival analysis and pathology assessment based on metabolite concentrations. We show that incorporating pathway information into the model architecture substantially reduces parameter complexity and achieves better survival analysis and pathological classification performance. With these design decisions, we show that PiDeeL improves tumor pathology prediction performance of the state-of-the-art in terms of the Area Under the ROC Curve by 3.38% and the Area Under the Precision-Recall Curve by 4.06%. Similarly, with respect to the time-dependent concordance index (c-index), PiDeeL achieves better survival analysis performance (improvement of 4.3%) when compared to the state-of-the-art. Moreover, we show that importance analyses performed on input metabolite features as well as pathway-specific neurons of PiDeeL provide insights into tumor metabolism. We foresee that the use of this model in the surgery room will help surgeons adjust the surgery plan on the fly and will result in better prognosis estimates tailored to surgical procedures. AVAILABILITY AND IMPLEMENTATION The code is released at https://github.com/ciceklab/PiDeeL. The data used in this study are released at https://zenodo.org/record/7228791.
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Affiliation(s)
- Gun Kaynar
- Computer Engineering Department, Bilkent University, 06800 Ankara, Turkey
| | - Doruk Cakmakci
- School of Computer Science, McGill University, Montreal, QC, H3A 0E9, Canada
| | - Caroline Bund
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg 67098, France
- ICube, University of Strasbourg, CNRS UMR, 7357, Strasbourg 67000, France
- Department of Nuclear Medicine and Molecular Imaging, ICANS, Strasbourg 67000, France
| | - Julien Todeschi
- Department of Neurosurgery, University Hospitals of Strasbourg, Strasbourg, 67091, France
| | - Izzie Jacques Namer
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg 67098, France
- ICube, University of Strasbourg, CNRS UMR, 7357, Strasbourg 67000, France
- Department of Nuclear Medicine and Molecular Imaging, ICANS, Strasbourg 67000, France
| | - A Ercument Cicek
- Computer Engineering Department, Bilkent University, 06800 Ankara, Turkey
- Computational Biology Department, Carnegie Mellon University, Pittsburgh, PA 15213, United States
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6
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Walke A, Black D, Valdes PA, Stummer W, König S, Suero-Molina E. Challenges in, and recommendations for, hyperspectral imaging in ex vivo malignant glioma biopsy measurements. Sci Rep 2023; 13:3829. [PMID: 36882505 PMCID: PMC9992662 DOI: 10.1038/s41598-023-30680-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 02/28/2023] [Indexed: 03/09/2023] Open
Abstract
The visualization of protoporphyrin IX (PPIX) fluorescence with the help of surgical microscopes during 5-aminolevulinic acid-mediated fluorescence-guided resection (FGR) of gliomas is still limited at the tumor margins. Hyperspectral imaging (HI) detects PPIX more sensitively but is not yet ready for intraoperative use. We illustrate the current status with three experiments and summarize our own experience using HI: (1) assessment of HI analysis algorithm using pig brain tissue, (2) a partially retrospective evaluation of our experience from HI projects, and (3) device comparison of surgical microscopy and HI. In (1), we address the problem that current algorithms for evaluating HI data are based on calibration with liquid phantoms, which have limitations. Their pH is low compared to glioma tissue; they provide only one PPIX photo state and only PPIX as fluorophore. Testing the HI algorithm with brain homogenates, we found proper correction for optical properties but not pH. Considerably more PPIX was measured at pH 9 than at pH 5. In (2), we indicate pitfalls and guide HI application. In (3), we found HI superior to the microscope for biopsy diagnosis (AUC = 0.845 ± 0.024 (cut-off 0.75 µg PPIX/ml) vs. 0.710 ± 0.035). HI thus offers potential for improved FGR.
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Affiliation(s)
- Anna Walke
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, A1, 48149, Münster, Germany.,Core Unit Proteomics, Interdisciplinary Centre for Clinical Research, University of Münster, Münster, Germany
| | - David Black
- Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada
| | - Pablo A Valdes
- Department of Neurosurgery, University of Texas Medical Branch, Galveston, TX, USA
| | - Walter Stummer
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, A1, 48149, Münster, Germany
| | - Simone König
- Core Unit Proteomics, Interdisciplinary Centre for Clinical Research, University of Münster, Münster, Germany
| | - Eric Suero-Molina
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, A1, 48149, Münster, Germany.
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7
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Cakmakci D, Kaynar G, Bund C, Piotto M, Proust F, Namer IJ, Cicek AE. Targeted metabolomics analyses for brain tumor margin assessment during surgery. BIOINFORMATICS (OXFORD, ENGLAND) 2022; 38:3238-3244. [PMID: 35512389 DOI: 10.1093/bioinformatics/btac309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 04/13/2022] [Accepted: 05/02/2022] [Indexed: 01/17/2023]
Abstract
MOTIVATION Identification and removal of micro-scale residual tumor tissue during brain tumor surgery are key for survival in glioma patients. For this goal, High-Resolution Magic Angle Spinning Nuclear Magnetic Resonance (HRMAS NMR) spectroscopy-based assessment of tumor margins during surgery has been an effective method. However, the time required for metabolite quantification and the need for human experts such as a pathologist to be present during surgery are major bottlenecks of this technique. While machine learning techniques that analyze the NMR spectrum in an untargeted manner (i.e. using the full raw signal) have been shown to effectively automate this feedback mechanism, high dimensional and noisy structure of the NMR signal limits the attained performance. RESULTS In this study, we show that identifying informative regions in the HRMAS NMR spectrum and using them for tumor margin assessment improves the prediction power. We use the spectra normalized with the ERETIC (electronic reference to access in vivo concentrations) method which uses an external reference signal to calibrate the HRMAS NMR spectrum. We train models to predict quantities of metabolites from annotated regions of this spectrum. Using these predictions for tumor margin assessment provides performance improvements up to 4.6% the Area Under the ROC Curve (AUC-ROC) and 2.8% the Area Under the Precision-Recall Curve (AUC-PR). We validate the importance of various tumor biomarkers and identify a novel region between 7.97 ppm and 8.09 ppm as a new candidate for a glioma biomarker. AVAILABILITY AND IMPLEMENTATION The code is released at https://github.com/ciceklab/targeted_brain_tumor_margin_assessment. The data underlying this article are available in Zenodo, at https://doi.org/10.5281/zenodo.5781769. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Doruk Cakmakci
- School of Computer Science, McGill University, Montreal, QC H3A 0E9, Canada
| | - Gun Kaynar
- School of Computer Science, McGill University, Montreal, QC H3A 0E9, Canada
| | - Caroline Bund
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg 67098, France.,ICube, University of Strasbourg/CNRS UMR 7357, Strasbourg 67000, France.,Department of Nuclear Medicine and Molecular Imaging, ICANS, Strasbourg 67000, France
| | | | - Francois Proust
- Department of Neurosurgery, University Hospitals of Strasbourg, Strasbourg 67091, France
| | - Izzie Jacques Namer
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg 67098, France.,ICube, University of Strasbourg/CNRS UMR 7357, Strasbourg 67000, France.,Department of Nuclear Medicine and Molecular Imaging, ICANS, Strasbourg 67000, France
| | - A Ercument Cicek
- Computer Engineering Department, Bilkent University, Ankara 06800, Turkey.,Computational Biology Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
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8
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Mehidine H, Devaux B, Varlet P, Abi Haidar D. Comparative Study Between a Customized Bimodal Endoscope and a Benchtop Microscope for Quantitative Tissue Diagnosis. Front Oncol 2022; 12:881331. [PMID: 35686105 PMCID: PMC9171499 DOI: 10.3389/fonc.2022.881331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 03/31/2022] [Indexed: 12/24/2022] Open
Abstract
Nowadays, surgical removal remains the standard method to treat brain tumors. During surgery, the neurosurgeon may encounter difficulties to delimitate tumor boundaries and the infiltrating areas as they have a similar visual appearance to adjacent healthy zones. These infiltrating residuals increase the tumor recurrence risk, which decreases the patient’s post-operation survival time. To help neurosurgeons improve the surgical act by accurately delimitating healthy from cancerous areas, our team is developing an intraoperative multimodal imaging tool. It consists of a two-photon fluorescence fibered endomicroscope that is intended to provide a fast, real-time, and reliable diagnosis information. In parallel to the instrumental development, a large optical database is currently under construction in order to characterize healthy and tumor brain tissues with their specific optical signature using multimodal analysis of the endogenous fluorescence. Our previous works show that this multimodal analysis could provide a reliable discrimination response between different tissue types based on several optical indicators. Here, our goal is to show that the two-photon fibered endomicroscope is able to provide, based on the same approved indicators in the tissue database, the same reliable response that could be used intraoperatively. We compared the spectrally resolved and time-resolved fluorescence signal, generated by our two-photon bimodal endoscope from 46 fresh brain tissue samples, with a similar signal provided by a standard reference benchtop multiphoton microscope that has been validated for tissue diagnosis. The higher excitation efficiency and collection ability of an endogenous fluorescence signal were shown for the endoscope setup. Similar molecular ratios and fluorescence lifetime distributions were extracted from the two compared setups. Spectral discrimination ability of the bimodal endoscope was validated. As a preliminary step before tackling multimodality, the ability of the developed bimodal fibered endoscope to excite and to collect efficiently as well as to provide a fast exploitable high-quality signal that is reliable to discriminate different types of human brain tissues was validated.
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Affiliation(s)
| | - Bertrand Devaux
- Université Paris Cité - Faculté de Médecine Paris Descartes, Paris, France.,Service de Neurochirurgie, Hôpital Lariboisière, Paris, France.,Department of Neurosurgery, GHU Paris Psychiatrie et Neuroscience, Paris, France
| | - Pascale Varlet
- Université Paris Cité - Faculté de Médecine Paris Descartes, Paris, France.,Department of Neuropathology, GHU Paris-Psychiatrie et Neurosciences, Sainte-Anne Hospital, Paris, France.,IMA BRAIN, INSERM UMR S1266, Centre de Psychiatrie et de Neurosciences, Paris, France
| | - Darine Abi Haidar
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.,Université Paris Cité, IJCLab, Orsay, France
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9
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Shapey J, Xie Y, Nabavi E, Ebner M, Saeed SR, Kitchen N, Dorward N, Grieve J, McEvoy AW, Miserocchi A, Grover P, Bradford R, Lim YM, Ourselin S, Brandner S, Jaunmuktane Z, Vercauteren T. Optical properties of human brain and tumour tissue: An ex vivo study spanning the visible range to beyond the second near-infrared window. JOURNAL OF BIOPHOTONICS 2022; 15:e202100072. [PMID: 35048541 DOI: 10.1002/jbio.202100072] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 12/15/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
Neuro-oncology surgery would benefit from detailed intraoperative tissue characterization provided by noncontact, contrast-agent-free, noninvasive optical imaging methods. In-depth knowledge of target tissue optical properties across a wide-wavelength spectrum could inform the design of optical imaging and computational methods to enable robust tissue analysis during surgery. We adapted a dual-beam integrating sphere to analyse small tissue samples and investigated ex vivo optical properties of five types of human brain tumour (meningioma, pituitary adenoma, schwannoma, low- and high-grade glioma) and nine different types of healthy brain tissue across a wavelength spectrum of 400 to 1800 nm. Fresh and frozen tissue samples were analysed. All tissue types demonstrated similar absorption spectra, but the reduced scattering coefficients of tumours show visible differences in the obtained optical spectrum compared to those of surrounding normal tissue. These results underline the potential of optical imaging technologies for intraoperative tissue characterization.
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Affiliation(s)
- Jonathan Shapey
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, London, UK
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - Yijing Xie
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - Elham Nabavi
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - Michael Ebner
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - Shakeel R Saeed
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
- The Ear Institute, University College London, London, UK
- The Royal National Throat, Nose and Ear Hospital, London, UK
| | - Neil Kitchen
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Neil Dorward
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Joan Grieve
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Andrew W McEvoy
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Anna Miserocchi
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Patrick Grover
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Robert Bradford
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Yau-Mun Lim
- Division of Neuropathology, UCL Queen Square Institute of Neurology, and The National Hospital for Neurology and Neurosurgery, University College Hospitals NHS Foundation Trust, London, UK
| | - Sebastien Ourselin
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - Sebastian Brandner
- Division of Neuropathology, UCL Queen Square Institute of Neurology, and The National Hospital for Neurology and Neurosurgery, University College Hospitals NHS Foundation Trust, London, UK
| | - Zane Jaunmuktane
- Division of Neuropathology, UCL Queen Square Institute of Neurology, and The National Hospital for Neurology and Neurosurgery, University College Hospitals NHS Foundation Trust, London, UK
| | - Tom Vercauteren
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
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10
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Zhang WQ, Sorvina A, Morrison JL, Darby JRT, Brooks DA, Plush SE, Afshar Vahid S. Development of an optical fiber-based redox monitoring system for tissue metabolism. JOURNAL OF BIOPHOTONICS 2022; 15:e202100304. [PMID: 35038239 DOI: 10.1002/jbio.202100304] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 01/11/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
An optical redox ratio can potentially be used to report on the dynamics of cell and tissue metabolism and define altered metabolic conditions for different pathologies. While there are methods to measure the optical redox ratio, they are not particularly suited to real-time in situ or in vivo analysis. Here, we have developed a fiber-optic system to measure redox ratios in cells and tissues and two mathematical models to enable real-time, in vivo redox measurements. The optical redox ratios in tissue explants are correlated directly with endogenous NADH/FAD fluorescence emissions. We apply the mathematical models to the two-photon microscopy data and show consistent results. We also used our fiber-optic system to measure redox in different tissues and show consistent results between the two models, hence demonstrating proof-of-principle. This innovative redox monitoring system will have practical applications for defining different metabolic disease states.
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Affiliation(s)
- Wen Qi Zhang
- Laser Physics and Photonic Devices Laboratories, School of Engineering, University of South Australia, Adelaide, South Australia, Australia
| | - Alexandra Sorvina
- Clinical and Health Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Janna L Morrison
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Jack R T Darby
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Doug A Brooks
- Clinical and Health Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Sally E Plush
- Clinical and Health Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Shahraam Afshar Vahid
- Laser Physics and Photonic Devices Laboratories, School of Engineering, University of South Australia, Adelaide, South Australia, Australia
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11
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Dubal J, Arce P, South C, Florescu L. Cherenkov light emission in molecular radiation therapy of the thyroid and its application to dosimetry. BIOMEDICAL OPTICS EXPRESS 2022; 13:2431-2449. [PMID: 35519238 PMCID: PMC9045923 DOI: 10.1364/boe.448139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/07/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Numerical experiments based on Monte Carlo simulations and clinical CT data are performed to investigate the spatial and spectral characteristics of Cherenkov light emission and the relationship between Cherenkov light intensity and deposited dose in molecular radiotherapy of hyperthyroidism and papillary thyroid carcinoma. It is found that Cherenkov light is emitted mostly in the treatment volume, the spatial distribution of Cherenkov light at the surface of the patient presents high-value regions at locations that depend on the symmetry and location of the treatment volume, and the surface light in the near-infrared spectral region originates from the treatment site. The effect of inter-patient variability in the tissue optical parameters and radioisotope uptake on the linear relationship between the dose absorbed by the treatment volume and Cherenkov light intensity at the surface of the patient is investigated, and measurements of surface light intensity for which this effect is minimal are identified. The use of Cherenkov light measurements at the patient surface for molecular radiation therapy dosimetry is also addressed.
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Affiliation(s)
- Jigar Dubal
- Centre for Vision, Speech and Signal Processing, University of Surrey, GU2 7XH, United Kingdom
| | - Pedro Arce
- CIEMAT (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas), 28040 Madrid, Spain
| | - Christopher South
- Department of Medical Physics, Royal Surrey County Hospital NHS Foundation Trust, Guildford GU2 7XX, United Kingdom
| | - Lucia Florescu
- Centre for Vision, Speech and Signal Processing, University of Surrey, GU2 7XH, United Kingdom
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12
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Fisher C, Harty J, Yee A, Li CL, Komolibus K, Grygoryev K, Lu H, Burke R, Wilson BC, Andersson-Engels S. Perspective on the integration of optical sensing into orthopedic surgical devices. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:010601. [PMID: 34984863 PMCID: PMC8727454 DOI: 10.1117/1.jbo.27.1.010601] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
SIGNIFICANCE Orthopedic surgery currently comprises over 1.5 million cases annually in the United States alone and is growing rapidly with aging populations. Emerging optical sensing techniques promise fewer side effects with new, more effective approaches aimed at improving patient outcomes following orthopedic surgery. AIM The aim of this perspective paper is to outline potential applications where fiberoptic-based approaches can complement ongoing development of minimally invasive surgical procedures for use in orthopedic applications. APPROACH Several procedures involving orthopedic and spinal surgery, along with the clinical challenge associated with each, are considered. The current and potential applications of optical sensing within these procedures are discussed and future opportunities, challenges, and competing technologies are presented for each surgical application. RESULTS Strong research efforts involving sensor miniaturization and integration of optics into existing surgical devices, including K-wires and cranial perforators, provided the impetus for this perspective analysis. These advances have made it possible to envision a next-generation set of devices that can be rigorously evaluated in controlled clinical trials to become routine tools for orthopedic surgery. CONCLUSIONS Integration of optical devices into surgical drills and burrs to discern bone/tissue interfaces could be used to reduce complication rates across a spectrum of orthopedic surgery procedures or to aid less-experienced surgeons in complex techniques, such as laminoplasty or osteotomy. These developments present both opportunities and challenges for the biomedical optics community.
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Affiliation(s)
- Carl Fisher
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - James Harty
- Cork University Hospital and South Infirmary Victoria University Hospital, Department of Orthopaedic Surgery, Cork, Ireland
| | - Albert Yee
- University of Toronto, Sunnybrook Research Institute, Department of Surgery, Holland Bone and Joint Program, Division of Orthopaedic Surgery, Sunnybrook Health Sciences; Orthopaedic Biomechanics Laboratory, Physical Sciences Platform, Toronto, Canada
| | - Celina L. Li
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - Katarzyna Komolibus
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - Konstantin Grygoryev
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - Huihui Lu
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - Ray Burke
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
| | - Brian C. Wilson
- University of Toronto, Princess Margaret Cancer Centre/University Health Network, Department of Medical Biophysics, Toronto, Canada
| | - Stefan Andersson-Engels
- Biophotonics@Tyndall, IPIC, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
- University College Cork, Department of Physics, Cork, Ireland
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13
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Tucker M, Ma G, Ross W, Buckland DM, Codd PJ. Creation of an Automated Fluorescence Guided Tumor Ablation System. IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE-JTEHM 2021; 9:4300109. [PMID: 34765325 PMCID: PMC8577571 DOI: 10.1109/jtehm.2021.3097210] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 06/05/2021] [Accepted: 06/24/2021] [Indexed: 01/03/2023]
Abstract
OBJECTIVE Create a device that improves the identification and extent of resection at the interface between healthy and tumor tissue; ultimately, using this device would improve surgical outcomes for patients and increase survival. METHODS We have created a contactless tumor removal system that utilizes endogenous fluorescence feedback to inform a laser ablation system to execute autonomous removal of phantom tumor tissue. RESULTS This completely non-contact surgical system is capable of resecting the tumor boundary of a tissue phantom with an average root mean square error (RMSE) of approximately 1.55 mm and an average max error of approximately 2.15 mm. There is no difference in the performance of the system when changing the size of the internal tumor from 7.5-12.5 mm in diameter. DISCUSSION Future research steps include creating a more intelligent spectral search strategy to increase the density of points around the resection boundary, and to develop a more sophisticated classifier to predict pathologic diagnosis and tissue subtypes located regionally around the tumor boundaries. We envision this device being used to resect the boundaries of tumors identified by exogenously delivered tumor-labeling fluorophores, such as fluorescein or 5-ALA, in addition to approaches relying on autofluorescence of endogenous fluorophores.
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Affiliation(s)
- Matthew Tucker
- Department of Mechanical Engineering and Materials ScienceDuke University Durham NC 27708 USA
| | - Guangshen Ma
- Department of Mechanical Engineering and Materials ScienceDuke University Durham NC 27708 USA
| | - Weston Ross
- Department of NeurosurgeryDuke University Durham NC 27708 USA
| | - Daniel M Buckland
- Department of Mechanical Engineering and Materials ScienceDuke University Durham NC 27708 USA.,Division of Emergency MedicineDuke University Durham NC 27708 USA
| | - Patrick J Codd
- Department of Mechanical Engineering and Materials ScienceDuke University Durham NC 27708 USA.,Division of Emergency MedicineDuke University Durham NC 27708 USA
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14
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Connolly PWR, Valli J, Shah YD, Altmann Y, Grant J, Accarino C, Rickman C, Cumming DRS, Buller GS. Simultaneous multi-spectral, single-photon fluorescence imaging using a plasmonic colour filter array. JOURNAL OF BIOPHOTONICS 2021; 14:e202000505. [PMID: 33829644 DOI: 10.1002/jbio.202000505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/25/2021] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
We present the first realisation of simultaneous multi-spectral fluorescence imaging using a single-photon avalanche diode (SPAD) array, where the spectral unmixing is facilitated by a plasmonic metasurface mosaic colour filter array (CFA). A 64 × 64 pixel format silicon SPAD array is used to record widefield fluorescence and brightfield data from four biological samples. A plasmonic metasurface composed of an arrangement of circular and elliptical nanoholes etched into an aluminium thin film deposited on a glass substrate provides the high transmission efficiency CFA, enabling a bespoke spectral unmixing algorithm to reconstruct high fidelity, full colour images from as few as ∼3 photons per pixel. This approach points the way toward real-time, single-photon sensitive multi-spectral fluorescence imaging. Furthermore, this is possible without additional bulky components such as a filter wheel, prism or diffraction grating, nor the need for multiple sample exposures or multiple detectors.
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Affiliation(s)
- Peter W R Connolly
- School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - Jessica Valli
- School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - Yash D Shah
- School of Engineering, University of Glasgow, University of Glasgow, Glasgow, UK
- School of Physics and Astronomy, University of Glasgow, Glasgow, UK
| | - Yoann Altmann
- School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - James Grant
- School of Engineering, University of Glasgow, University of Glasgow, Glasgow, UK
| | - Claudio Accarino
- School of Engineering, University of Glasgow, University of Glasgow, Glasgow, UK
| | - Colin Rickman
- School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - David R S Cumming
- School of Engineering, University of Glasgow, University of Glasgow, Glasgow, UK
| | - Gerald S Buller
- School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
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15
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Mehidine H, Refregiers M, Jamme F, Varlet P, Juchaux M, Devaux B, Abi Haidar D. Molecular changes tracking through multiscale fluorescence microscopy differentiate Meningioma grades and non-tumoral brain tissues. Sci Rep 2021; 11:3816. [PMID: 33589651 PMCID: PMC7884789 DOI: 10.1038/s41598-020-78678-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 11/19/2020] [Indexed: 11/08/2022] Open
Abstract
Meningioma is the most common primary intracranial extra-axial tumor. Total surgical removal is the standard therapeutic method to treat this type of brain tumors. However, the risk of recurrence depends on the tumor grade and the extent of the resection including the infiltrated dura mater and, if necessary, the infiltrated bone. Therefore, proper resection of all invasive tumor borders without touching eloquent areas is of primordial in order to decrease the risk of recurrence. Nowadays, none of the intraoperative used tools is able to provide a precise real-time histopathological information on the tumor surrounding areas to help the surgeon to achieve a gross total removal. To respond to this problem, our team is developing a multimodal two-photon fluorescence endomicroscope, compatible with the surgeon tool, to better delimitate tumor boundaries, relying on the endogenous fluorescence of brain tissues. In this context, we are building a tissue database in order to specify each brain tissue, whether healthy or tumoral, with its specific optical signature. In this study, we present a multimodal and multiscale optical measurements on non-tumoral control brain tissue obtained in epilepsy surgery patients and several meningioma grades. We investigated tissue auto-fluorescence to track the molecular changes associated with the tumor grade from deep ultra-violet (DUV) to near infrared (NIR) excitation. Micro-spectroscopy, fluorescence lifetime imaging, two-photon fluorescence imaging and Second Harmonic Generation (SHG) imaging were performed. Several optically derived parameters such as collagen crosslinks fluorescence in DUV, SHG emission in NIR and long lifetime intensity fraction of Nicotinamide Adenine Dinucleotide and Flavins were correlated to discriminate cancerous tissue from control one. While collagen response managed to discriminate meningioma grades from control samples with a 100% sensitivity and 90% specificity through a 3D discriminative algorithm.
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Affiliation(s)
- Hussein Mehidine
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
- Université de Paris, IJCLab, 91405, Orsay, France
| | | | - Frédéric Jamme
- DISCO Beamline, Synchrotron SOLEIL, 91192, Gif-sur-Yvette, France
| | - Pascale Varlet
- GHU Psychiatrie et Neurosciences, site Sainte-Anne, service de neuropathologie, 75014, Paris, France
- IMA BRAIN, INSERM U894, Centre de Psychiatrie Et de Neurosciences, 75014, Paris, France
- Université de Paris, 75006, Paris, France
| | - Marjorie Juchaux
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
| | - Bertrand Devaux
- GHU Psychiatrie et Neurosciences, site Sainte-Anne, service de neuropathologie, 75014, Paris, France
- Université de Paris, 75006, Paris, France
| | - Darine Abi Haidar
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France.
- Université de Paris, IJCLab, 91405, Orsay, France.
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16
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Iorizzo TW, Jermain PR, Salomatina E, Muzikansky A, Yaroslavsky AN. Temperature induced changes in the optical properties of skin in vivo. Sci Rep 2021; 11:754. [PMID: 33436982 PMCID: PMC7803738 DOI: 10.1038/s41598-020-80254-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 12/17/2020] [Indexed: 12/02/2022] Open
Abstract
Knowledge of temperature-induced changes of skin optical properties is required for accurate dosimetry of photothermal treatments. We determined and compared in vivo optical properties of mouse ear skin at different temperatures. The diffuse reflectance, total and diffuse transmittance were measured in the spectral range from 400 to 1650 nm using an integrating sphere spectrometer at the temperatures of 25 °C, 36 °C and 60 °C. Target temperatures were attained and maintained using an automated heater equipped with a sensor for feed-back and control. Temperature and temperature induced morphological changes of skin were monitored using an infrared thermal camera and reflectance confocal microscopy, respectively. An inverse Monte Carlo technique was utilized to determine absorption, scattering, and anisotropy factors from the measured quantities. Our results indicate significant differences between the optical properties of skin at different temperatures. Absorption and scattering coefficients increased, whereas anisotropy factors decreased with increasing temperature. Changes in absorption coefficients indicate deoxygenation of hemoglobin, and a blue shift of water absorption bands. Confocal imaging confirmed that our observations can be explained by temperature induced protein denaturation and blood coagulation. Monitoring spectral responses of treated tissue may become a valuable tool for accurate dosimetry of light treatments.
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Affiliation(s)
- Tyler W Iorizzo
- Advanced Biophotonics Laboratory, University of Massachusetts Lowell, 175 Cabot Street, Lowell, MA, 01854, USA
| | - Peter R Jermain
- Advanced Biophotonics Laboratory, University of Massachusetts Lowell, 175 Cabot Street, Lowell, MA, 01854, USA
| | - Elena Salomatina
- Department of Dermatology, Massachusetts General Hospital, 50 Staniford Street, Boston, MA, 02114, USA
| | - Alona Muzikansky
- Biostatistics Center, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Anna N Yaroslavsky
- Advanced Biophotonics Laboratory, University of Massachusetts Lowell, 175 Cabot Street, Lowell, MA, 01854, USA. .,Department of Dermatology, Massachusetts General Hospital, 50 Staniford Street, Boston, MA, 02114, USA.
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17
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Cakmakci D, Karakaslar EO, Ruhland E, Chenard MP, Proust F, Piotto M, Namer IJ, Cicek AE. Machine learning assisted intraoperative assessment of brain tumor margins using HRMAS NMR spectroscopy. PLoS Comput Biol 2020; 16:e1008184. [PMID: 33175838 PMCID: PMC7682900 DOI: 10.1371/journal.pcbi.1008184] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 11/23/2020] [Accepted: 07/22/2020] [Indexed: 11/19/2022] Open
Abstract
Complete resection of the tumor is important for survival in glioma patients. Even if the gross total resection was achieved, left-over micro-scale tissue in the excision cavity risks recurrence. High Resolution Magic Angle Spinning Nuclear Magnetic Resonance (HRMAS NMR) technique can distinguish healthy and malign tissue efficiently using peak intensities of biomarker metabolites. The method is fast, sensitive and can work with small and unprocessed samples, which makes it a good fit for real-time analysis during surgery. However, only a targeted analysis for the existence of known tumor biomarkers can be made and this requires a technician with chemistry background, and a pathologist with knowledge on tumor metabolism to be present during surgery. Here, we show that we can accurately perform this analysis in real-time and can analyze the full spectrum in an untargeted fashion using machine learning. We work on a new and large HRMAS NMR dataset of glioma and control samples (n = 565), which are also labeled with a quantitative pathology analysis. Our results show that a random forest based approach can distinguish samples with tumor cells and controls accurately and effectively with a median AUC of 85.6% and AUPR of 93.4%. We also show that we can further distinguish benign and malignant samples with a median AUC of 87.1% and AUPR of 96.1%. We analyze the feature (peak) importance for classification to interpret the results of the classifier. We validate that known malignancy biomarkers such as creatine and 2-hydroxyglutarate play an important role in distinguishing tumor and normal cells and suggest new biomarker regions. The code is released at http://github.com/ciceklab/HRMAS_NC.
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Affiliation(s)
- Doruk Cakmakci
- Computer Engineering Department, Bilkent University, Ankara, Turkey
| | | | - Elisa Ruhland
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg, France
| | | | - Francois Proust
- Department of Neurosurgery, University Hospitals of Strasbourg, Strasbourg, France
| | | | - Izzie Jacques Namer
- MNMS Platform, University Hospitals of Strasbourg, Strasbourg, France
- ICube, University of Strasbourg / CNRS UMR 7357, Strasbourg, France
- Department of Nuclear Medicine and Molecular Imaging, ICANS, Strasbourg, France
| | - A. Ercument Cicek
- Computer Engineering Department, Bilkent University, Ankara, Turkey
- Computational Biology Department, Carnegie Mellon University, Pittsburgh, Pennsylvania
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18
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Špaková I, Dubayová K, Nagyová V, Mareková M. Fluorescence biomarkers of malignant melanoma detectable in urine. OPEN CHEM 2020. [DOI: 10.1515/chem-2020-0143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
AbstractMalignant melanoma (MM) is a cancerous transformation of melanocytes. It is a disease with the worst response to therapy and, compared to other malignancies, presents much earlier with metastases. MM still belongs to relatively late-detected malignant diseases. Even so, the MM mortality rate is up to 96% for a relatively small incidence (5%). The gold standard for MM diagnosis is a histopathological examination that requires invasive surgery. An invasive sampling method of a biological material can be a stressful factor for the patient, which is often the reason why patients do not seek medical assistance as soon as possible. Our goal was to find a link between metabolites in urine and the stage of MM. Two excitation peaks at 360–370 nm and 450 nm were characterised in spectra of urine samples. The emission spectra have shown one significant peak at 410–460 nm. After addition of glutathione reductase to the samples, fluorescence dropped down only in patient samples and hidden fluorophores appeared. Malignant diseases are associated with the presence of specific metabolites that can be detected fluorescently in biological material such as urine, which can be a suitable alternative for an early detection of cancer or for tracking changes during and after treatment.
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Affiliation(s)
- Ivana Špaková
- Department of Medical and Clinical Biochemistry, Pavol Jozef Šafárik University in Košice, Faculty of Medicine, Trieda SNP 1, Košice, 04011, Slovakia
| | - Katarína Dubayová
- Department of Medical and Clinical Biochemistry, Pavol Jozef Šafárik University in Košice, Faculty of Medicine, Trieda SNP 1, Košice, 04011, Slovakia
| | - Vladimíra Nagyová
- Department of Dermatovenerology, Pavol Jozef Šafárik University in Košice, Faculty of Medicine, Košice, 04011, Slovakia
| | - Mária Mareková
- Department of Medical and Clinical Biochemistry, Pavol Jozef Šafárik University in Košice, Faculty of Medicine, Trieda SNP 1, Košice, 04011, Slovakia
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19
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Lagarto JL, Villa F, Tisa S, Zappa F, Shcheslavskiy V, Pavone FS, Cicchi R. Real-time multispectral fluorescence lifetime imaging using Single Photon Avalanche Diode arrays. Sci Rep 2020; 10:8116. [PMID: 32415224 PMCID: PMC7229199 DOI: 10.1038/s41598-020-65218-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 04/24/2020] [Indexed: 12/19/2022] Open
Abstract
Autofluorescence spectroscopy has emerged in recent years as a powerful tool to report label-free contrast between normal and diseased tissues, both in vivo and ex vivo. We report the development of an instrument employing Single Photon Avalanche Diode (SPAD) arrays to realize real-time multispectral autofluorescence lifetime imaging at a macroscopic scale using handheld single-point fibre optic probes, under bright background conditions. At the detection end, the fluorescence signal is passed through a transmission grating and both spectral and temporal information are encoded in the SPAD array. This configuration allows interrogation in the spectral range of interest in real time. Spatial information is provided by an external camera together with a guiding beam that provides a visual reference that is tracked in real-time. Through fast image processing and data analysis, fluorescence lifetime maps are augmented on white light images to provide feedback of the measurements in real-time. We validate and demonstrate the practicality of this technique in the reference fluorophores and in articular cartilage samples mimicking the degradation that occurs in osteoarthritis. Our results demonstrate that SPADs together with fibre probes can offer means to report autofluorescence spectral and lifetime contrast in real-time and thus are suitable candidates for in situ tissue diagnostics.
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Affiliation(s)
- João L Lagarto
- National Institute of Optics National Research Council (INO-CNR), Largo Enrico Fermi 6, 50125, Florence, Italy.
- European Laboratory for Non-linear Spectroscopy (LENS), Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy.
| | - Federica Villa
- Dipartimento di Elettronica, Informazione e Bioingegneria (DEIB), Politecnico di Milano, 20133, Milan, Italy
| | - Simone Tisa
- Micro Photon Device SRL, Via Waltraud Gebert Deeg 3g, I-39100, Bolzano, Italy
| | - Franco Zappa
- Dipartimento di Elettronica, Informazione e Bioingegneria (DEIB), Politecnico di Milano, 20133, Milan, Italy
| | - Vladislav Shcheslavskiy
- Becker & Hickl GmbH, Nunsdorfer Ring 7-9, 12277, Berlin, Germany
- Privolzhskiy Medical Research University, 603005, Nizhny Novgorod, Russia
| | - Francesco S Pavone
- National Institute of Optics National Research Council (INO-CNR), Largo Enrico Fermi 6, 50125, Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy
- Department of Physics, University of Florence, Via G. Sansone 1, 50019, Sesto Fiorentino, Italy
| | - Riccardo Cicchi
- National Institute of Optics National Research Council (INO-CNR), Largo Enrico Fermi 6, 50125, Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy
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20
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Sibai M, Mehidine H, Moawad EK, Juchaux M, Varlet P, Devaux B, Abi Haidar D. Comparison of optically-derived biomarkers in healthy and brain tumor tissue under one- and two-photon excitation. JOURNAL OF BIOPHOTONICS 2019; 12:e201900111. [PMID: 31276313 DOI: 10.1002/jbio.201900111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 07/02/2019] [Accepted: 07/04/2019] [Indexed: 06/09/2023]
Abstract
The surgical outcome of brain tumor resection and needle biopsy is significantly correlated to the patient's prognosis. Brain tumor surgery is limited to resecting the solid portion of the tumor as current intraoperative imaging modalities are incapable of delineating infiltrative regions. For accurate delineation, in situ tissue interrogation at the submicron scale is warranted. Additionally, multimodal detection is required to remediate the genetically and molecularly heterogeneous nature of brain tumors, notably, that of gliomas, meningioma and brain metastasis. Multimodal detection, such as spectrally- and temporally-resolved fluorescence under one- and two-photon excitation, enables characterizing tissue based on several endogenous optical contrasts. In order to assign the optically-derived parameters to different tissue types, construction of an optical database obtained from biopsied tissue is warranted. This report showcases the different quantitative and semi-quantitative optical markers that may comprise the tissue discrimination database. These include: the optical index ratio, the optical redox ratio, the relative collagen density, spectrally-resolved fluorescence lifetime parameters, two-photon fluorescence imaging and second harmonic generation imaging.
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Affiliation(s)
- Mira Sibai
- Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC), CNRS, Univ Paris Sud, Université Paris-Saclay, Orsay, France
- Université de Paris, IMNC, Orsay, France
| | - Hussein Mehidine
- Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC), CNRS, Univ Paris Sud, Université Paris-Saclay, Orsay, France
- Université de Paris, IMNC, Orsay, France
| | - Emile Kaadou Moawad
- Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC), CNRS, Univ Paris Sud, Université Paris-Saclay, Orsay, France
- Université de Paris, IMNC, Orsay, France
| | - Marjorie Juchaux
- Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC), CNRS, Univ Paris Sud, Université Paris-Saclay, Orsay, France
- Université de Paris, IMNC, Orsay, France
| | - Pascale Varlet
- Neuropathology Department, Sainte-Anne Hospital, Paris, France
- IMA BRAIN, INSERMU894, Centre de Psychiatrie et de Neurosciences, Paris, France
- Paris Descartes University, Paris, France
| | - Bertrand Devaux
- Paris Descartes University, Paris, France
- Neurosurgery Department, Sainte-Anne Hospital, Paris, France
| | - Darine Abi Haidar
- Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC), CNRS, Univ Paris Sud, Université Paris-Saclay, Orsay, France
- Université de Paris, IMNC, Orsay, France
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21
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Lagarto JL, Dyer BT, Peters NS, French PMW, Dunsby C, Lyon AR. In vivo label-free optical monitoring of structural and metabolic remodeling of myocardium following infarction. BIOMEDICAL OPTICS EXPRESS 2019; 10:3506-3521. [PMID: 31360603 PMCID: PMC6640823 DOI: 10.1364/boe.10.003506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/15/2019] [Accepted: 05/29/2019] [Indexed: 05/14/2023]
Abstract
Cardiac remodeling following myocardial infarction (MI) involves structural and functional alterations in the infarcted and remote viable myocardium that can ultimately lead to heart failure. The underlying mechanisms are not fully understood and, following our previous study of the autofluorescence lifetime and diffuse reflectance signatures of the myocardium in vivo at 16 weeks post MI in rats [Biomed. Opt. Express6(2), 324 (2015)], we here present data obtained at 1, 2 and 4 weeks post myocardial infarction that help follow the temporal progression of these changes. Our results demonstrate that both structural and metabolic changes in the heart can be monitored from the earliest time points following MI using label-free optical readouts, not only in the region of infarction but also in the remote non-infarcted myocardium. Changes in the autofluorescence intensity and lifetime parameters associated with collagen type I autofluorescence were indicative of progressive collagen deposition in tissue that was most pronounced at earlier time points and in the region of infarction. In addition to significant collagen deposition in infarcted and non-infarcted myocardium, we also report changes in the autofluorescence parameters associated with reduced nicotinamide adenine (phosphate) dinucleotide (NAD(P)H) and flavin adenine dinucleotide (FAD), which we associate with metabolic alterations throughout the heart. Parallel measurements of the diffuse reflectance spectra indicated an increased contribution of reduced cytochrome c. Our findings suggest that combining time-resolved spectrofluorometry and diffuse reflectance spectroscopy could provide a useful means to monitor cardiac function in vivo at the time of surgery.
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Affiliation(s)
- João L. Lagarto
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom
- Authors contributed equally to this work
| | - Benjamin T. Dyer
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London, W12 0NN, United Kingdom
- Authors contributed equally to this work
| | - Nicholas S. Peters
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London, W12 0NN, United Kingdom
- Centre for Cardiac Engineering, Imperial College London, Du Cane Road, London, W12 0NN, United Kingdom
| | - Paul M. W. French
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom
| | - Chris Dunsby
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom
- Centre for Pathology, Imperial College London Du Cane Road, London W12 0NN, United Kingdom
- Authors contributed equally to this work
| | - Alexander R. Lyon
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London, W12 0NN, United Kingdom
- Authors contributed equally to this work
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22
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Optical Signatures Derived From Deep UV to NIR Excitation Discriminates Healthy Samples From Low and High Grades Glioma. Sci Rep 2019; 9:8786. [PMID: 31217542 PMCID: PMC6584506 DOI: 10.1038/s41598-019-45181-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 05/29/2019] [Indexed: 12/28/2022] Open
Abstract
Among all the tumors of the central nervous system (CNS), glioma are the most deadly and the most malignant. Surgical resection is the standard therapeutic method to treat this type of brain cancer. But the diffusive character of these tumors create many problems for surgeons during the operation. In fact, these tumors migrate outside the tumor solid zone and invade the surrounding healthy tissues. These infiltrative tissues have the same visual appearance as healthy tissues, making it very difficult for surgeons to distinguish the healthy ones from the diffused ones. The surgeon, therefore, cannot properly remove the tumor margins increasing the recurrence risk of the tumor. To resolve this problem, our team has developed a multimodal two-photon fibered endomicroscope, compatible with the surgeon trocar, to better delimitate tumor boundaries by relying on the endogenous fluorescence of brain tissues. In this context, and in order to characterize the optical signature of glioma tumors, this study offers multimodal and multi-scaled optical measurements from healthy tissues to high grade glioma. We can interrogate tissue from deep ultra-violet to near infrared excitation by working with spectroscopy, fluorescence lifetime imaging, two-photon fluorescene imaging and Second Harmonic Generation (SHG) imaging. Optically derived ratios such as the Tryptophan/Collagen ratio, the optical redox ratio and the long lifetime intensity fraction, discriminated diseased tissue from its normal counterparts when fitted by Gaussian ellipsoids and choosing a threshold for each. Additionally two-photon fluorescence and SHG images were shown to display similar histological features as Hematoxylin-Eosin stained images.
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23
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Endoscopic Fluorescence-Guided Resection Increases Radicality in Glioblastoma Surgery. Oper Neurosurg (Hagerstown) 2019; 18:41-46. [DOI: 10.1093/ons/opz082] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 12/25/2018] [Indexed: 11/14/2022] Open
Abstract
Abstract
BACKGROUND
Several studies have proven the benefit of a greater extent of resection on progression-free survival and overall survival in glioblastoma (GBM). Possible reasons for incomplete tumor resection might be wrong interpretation of fading fluorescence or overseen fluorescent tumor tissue by a lacking line of sight between tumor tissue and the microscope.
OBJECTIVE
To evaluate if an endoscope being capable of inducing fluorescence might overcome some limitations of microscopic fluorescence-guided (FG) resection.
METHODS
5-Aminolevulinic acid (20 mg/kg) was given 4 h before surgery. Microsurgical resection of all fluorescent tissue was performed. Then, the resection cavity was scanned with the endoscope. Fluorescent tissue, not being visualized by the microscope, was additionally removed and histopathologically examined separately. Neuronavigation was used for defining the sites of additional tumor resection. All patients underwent magnetic resonance imaging within 48 h after surgery.
RESULTS
Twenty patients with GBM were operated using microscopic and endoscopic FG resection. In all patients, additional fluorescent tissue was detected with the endoscope. This tissue was completely resected in 19 patients (95%). Eloquent localization precluded complete resection in the remaining patient. In 19 patients (95%), histopathological examination confirmed tumor in the additionally resected tissue. In 19 patients (95%), complete resection was confirmed. In all patients, endoscopic FG resection reached beyond the borders of contrast-enhancing tumor.
CONCLUSION
Endoscopic FG resection of GBM allows increasing the complete resection rate substantially and therefore is a useful adjunct to microscopic FG resection.
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24
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Inverse heat transfer analysis in detecting tissue optical properties using laser. Lasers Med Sci 2019; 34:1671-1678. [PMID: 30877489 DOI: 10.1007/s10103-019-02767-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 03/06/2019] [Indexed: 10/27/2022]
Abstract
A new methodology has been proposed to measure optical properties of homogeneous tissue where a laser beam is used to induce heat to a tissue. The induced heat increased the temperature inside the tissue, which is detected by a thermocouple. These readings are compared with that obtained from the solution of the finite element solution that used iterative values of optical properties in determining temperature distribution. The two temperature distributions are used to determine tissue optical properties using the Levenberg-Marquardt iteration. An accurate result is obtained in determining absorption coefficient and reduced scattering coefficient. The work is extended to obtain three parameters (i.e., absorption coefficient, scattering coefficient, and anisotropy). The only limitation is that the temperature readings have to be measured with a high-accuracy thermocouple (i.e., less than 0.4% of maximum-recorded temperature).
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25
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Mehidine H, Sibai M, Poulon F, Pallud J, Varlet P, Zanello M, Devaux B, Abi Haidar D. Multimodal imaging to explore endogenous fluorescence of fresh and fixed human healthy and tumor brain tissues. JOURNAL OF BIOPHOTONICS 2019; 12:e201800178. [PMID: 30203459 DOI: 10.1002/jbio.201800178] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 09/07/2018] [Indexed: 06/08/2023]
Abstract
To complement a project toward label-free optical biopsy and enhanced resection which the overall goal is to develop a multimodal nonlinear endomicroscope, this multimodal approach aims to enhance the accuracy in classifying brain tissue into solid tumor, infiltration and normal tissue intraoperatively. Multiple optical measurements based on one- and two-photon spectral and lifetime autofluorescence, including second harmonic generation imaging, were acquired. As a prerequisite, studying the effect of the time of measurement postexcision on tissue's spectral/lifetime fluorescence properties was warranted, so spectral and lifetime fluorescences of fresh brain tissues were measured using a point-based linear endoscope. Additionally, a comparative study on tissue's optical properties obtained by multimodal nonlinear optical imaging microscope from fresh and fixed tissue was necessary to test whether clinical validation of the nonlinear endomicroscope is feasible by extracting optical signatures from fixed tissue rather than from freshly excised samples. The former is generally chosen for convenience. Results of this study suggest that an hour is necessary postexcision to have consistent fluorescence intensities\lifetimes. The fresh (a,b,c) vs fixed (d,e,f) tissue study indicates that while all optical signals differ after fixation. The characteristic features extracted from one- and two-photon excitation still discriminate normal brain (a,d) cortical tissue, glioblastoma (GBM) (b,e) and metastases (c,f).
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Affiliation(s)
- Hussein Mehidine
- IMNC Laboratory, UMR 8165-CNRS/ IN2P3, Paris-Saclay University, Orsay, France
- Paris Diderot University, Sorbonne Paris Cité, F-75013, Paris, France
| | - Mira Sibai
- IMNC Laboratory, UMR 8165-CNRS/ IN2P3, Paris-Saclay University, Orsay, France
| | - Fanny Poulon
- IMNC Laboratory, UMR 8165-CNRS/ IN2P3, Paris-Saclay University, Orsay, France
| | - Johan Pallud
- Neurosurgery Department, Sainte-Anne Hospital, Paris, France
- IMA BRAIN, INSERMU894, Centre de Psychiatrie et de Neurosciences, Paris, France
- Paris Descartes University, Paris, France
| | - Pascale Varlet
- IMA BRAIN, INSERMU894, Centre de Psychiatrie et de Neurosciences, Paris, France
- Paris Descartes University, Paris, France
- Neuropathology Department, Sainte-Anne Hospital, Paris, France
| | - Marc Zanello
- Neurosurgery Department, Sainte-Anne Hospital, Paris, France
- Paris Descartes University, Paris, France
| | - Bertrand Devaux
- Neurosurgery Department, Sainte-Anne Hospital, Paris, France
- Paris Descartes University, Paris, France
| | - Darine Abi Haidar
- IMNC Laboratory, UMR 8165-CNRS/ IN2P3, Paris-Saclay University, Orsay, France
- Paris Diderot University, Sorbonne Paris Cité, F-75013, Paris, France
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26
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The Impact of Compressed Femtosecond Laser Pulse Durations on Neuronal Tissue Used for Two-Photon Excitation Through an Endoscope. Sci Rep 2018; 8:11124. [PMID: 30042504 PMCID: PMC6057889 DOI: 10.1038/s41598-018-29404-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 07/11/2018] [Indexed: 11/09/2022] Open
Abstract
Accurate intraoperative tumour margin assessment is a major challenge in neurooncology, where sparse tumours beyond the bulk tumour are left undetected under conventional resection. Non-linear optical imaging can diagnose tissue at the sub-micron level and provide functional label-free histopathology in vivo. For this reason, a non-linear endomicroscope is being developed to characterize brain tissue intraoperatively based on multiple endogenous optical contrasts such as spectrally- and temporally-resolved fluorescence. To produce highly sensitive optical signatures that are specific to a given tissue type, short femtosecond pulsed lasers are required for efficient two-photon excitation. Yet, the potential of causing bio-damage has not been studied on neuronal tissue. Therefore, as a prerequisite to clinically testing the non-linear endomicroscope in vivo, the effect of short laser pulse durations (40-340 fs) on ex vivo brain tissue was investigated by monitoring the intensity, the spectral, and the lifetime properties of endogenous fluorophores under 800 and 890 nm two-photon excitation using a bi-modal non-linear endoscope. These properties were also validated by imaging samples on a benchtop multiphoton microscope. Our results show that under a constant mean laser power, excitation pulses as short as 40 fs do not negatively alter the biochemical/ biophysical properties of tissue even for prolonged irradiation.
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