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Krivetskaya AA, Kustov DM, Levkin VV, Osminin SV, Kharnas SS, Eventeva EV, Vetshev FP, Komarov RN, Linkov KG, Savelieva TA, Loschenov VB. Evaluation of tissue blood supply during esophagectomy using fluorescent diagnostics and diffuse scattering spectroscopy in visible region. Photodiagnosis Photodyn Ther 2024; 45:103937. [PMID: 38103583 DOI: 10.1016/j.pdpdt.2023.103937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/13/2023] [Accepted: 12/13/2023] [Indexed: 12/19/2023]
Abstract
BACKGROUND The success of the surgical treatment of a tumor or obstruction of the esophagus with subsequent anastomosis application depends on the level of blood supply to the stitched tissues. Intraoperative assessment of blood flow is widely used in medicine and can be used as a diagnostic method that affects the outcome of surgery and reduces the frequency of postoperative complications for the patient. METHODS In this work, the assessment of blood supply during esophageal resection operations was carried out using two techniques sequentially: fluorescent diagnostics with indocyanine green and measurement of hemoglobin oxygen saturation by diffuse scattering spectroscopy in the visible wavelength range. The first method was used to assess the integrity of the vascular network structure in the area of anastomosis and blood flow through the sutured tissues, the second one - for local assessment of hemoglobin oxygen saturation in the investigated area. RESULTS Conducted clinical study involved the participation of nine patients with malignant neoplasms (six cases) or esophageal obstruction (three cases). The presence of postoperative complications was compared with the measurement results. Anastomosis failure was observed in only one patient. According to the results of the study, with the use of the investigated method of assessing blood supply, there is a tendency towards a decrease in the frequency of anastomosis leaks (11.1 % compared with 21.4 %). CONCLUSIONS Therefore, fluorescent diagnostics with indocyanine green and measurement of hemoglobin oxygen saturation using diffuse scattering spectroscopy were affirmed as methods that allow increasing the safety of surgical procedures by assessing the risk of postoperative complications, including anastomosis failures.
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Affiliation(s)
- Anna A Krivetskaya
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia; Institute of Engineering Physics for Biomedicine, National Research Nuclear University MEPhI, 115409, Moscow, Russia.
| | - Daniil M Kustov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia
| | - Vladimir V Levkin
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Sergey V Osminin
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Sergey S Kharnas
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Evgenia V Eventeva
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Fedor P Vetshev
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Roman N Komarov
- Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University, 119992, Moscow, Russia
| | - Kirill G Linkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia
| | - Tatiana A Savelieva
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia; Institute of Engineering Physics for Biomedicine, National Research Nuclear University MEPhI, 115409, Moscow, Russia
| | - Victor B Loschenov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia; Institute of Engineering Physics for Biomedicine, National Research Nuclear University MEPhI, 115409, Moscow, Russia
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Yang M, Wei Y, Reineck P, Ebendorff-Heidepriem H, Li J, McLaughlin RA. Development of a glass-based imaging phantom to model the optical properties of human tissue. BIOMEDICAL OPTICS EXPRESS 2024; 15:346-359. [PMID: 38223187 PMCID: PMC10783914 DOI: 10.1364/boe.504774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/30/2023] [Accepted: 12/03/2023] [Indexed: 01/16/2024]
Abstract
The fabrication of a stable, reproducible optical imaging phantom is critical to the assessment and optimization of optical imaging systems. We demonstrate the use of an alternative material, glass, for the development of tissue-mimicking phantoms. The glass matrix was doped with nickel ions to approximate the absorption of hemoglobin. Scattering levels representative of human tissue were induced in the glass matrix through controlled crystallization at elevated temperatures. We show that this type of glass is a viable material for creating tissue-mimicking optical phantoms by providing controlled levels of scattering and absorption with excellent optical homogeneity, long-term stability and reproducibility.
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Affiliation(s)
- Mingze Yang
- School of Biomedicine, The University of Adelaide, Adelaide, SA, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, SA, Australia
| | - Yunle Wei
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, SA, Australia
- School of Physics, Chemistry and Earth Sciences, The University of Adelaide, Adelaide, SA, Australia
| | - Philipp Reineck
- School of Science, RMIT University, Melbourne, VIC, Australia
| | - Heike Ebendorff-Heidepriem
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, SA, Australia
- School of Physics, Chemistry and Earth Sciences, The University of Adelaide, Adelaide, SA, Australia
| | - Jiawen Li
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, SA, Australia
- School of Electrical and Mechanical Engineering, The University of Adelaide, Adelaide, SA, Australia
| | - Robert A. McLaughlin
- School of Biomedicine, The University of Adelaide, Adelaide, SA, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, SA, Australia
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Jonasson H, Fredriksson I, Bergstrand S, Östgren CJ, Larsson M, Strömberg T. Absorption and reduced scattering coefficients in epidermis and dermis from a Swedish cohort study. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:115001. [PMID: 38078153 PMCID: PMC10704088 DOI: 10.1117/1.jbo.28.11.115001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/25/2023] [Accepted: 10/30/2023] [Indexed: 12/18/2023]
Abstract
Significance Knowledge of optical properties is important to accurately model light propagation in tissue, but in vivo reference data are sparse. Aim The aim of our study was to present in vivo skin optical properties from a large Swedish cohort including 3809 subjects using a three-layered skin model and spatially resolved diffuse reflectance spectroscopy (Periflux PF6000 EPOS). Approach Diffuse reflectance spectra (475 to 850 nm) at 0.4 and 1.2 mm source-detector separations were analyzed using an inverse Monte Carlo method. The model had one epidermis layer with variable thicknesses and melanin-related absorptions and two dermis layers with varying hemoglobin concentrations and equal oxygen saturations. The reduced scattering coefficient was equal across all layers. Results Median absorption coefficients (mm - 1 ) in the upper dermis ranged from 0.094 at 475 nm to 0.0048 at 850 nm and similarly in the lower dermis from 0.059 to 0.0035. The reduced scattering coefficient (mm - 1 ) ranged from 3.22 to 1.20, and the sampling depth (mm) ranged from 0.23 to 0.38 (0.4 mm separation) and from 0.49 to 0.68 (1.2 mm separation). There were differences in optical properties across sex, age groups, and BMI categories. Conclusions Reference material for skin optical properties is presented.
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Affiliation(s)
- Hanna Jonasson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Ingemar Fredriksson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
- Perimed AB, Järfälla, Stockholm, Sweden
| | - Sara Bergstrand
- Linköping University, Department of Health, Medicine, and Caring Sciences, Linköping, Sweden
| | - Carl Johan Östgren
- Linköping University, Department of Health, Medicine, and Caring Sciences, Linköping, Sweden
- Linköping University, Centre of Medical Image Science and Visualization Linköping, Sweden
| | - Marcus Larsson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Tomas Strömberg
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
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Walter AB, Jansen ED. Development of a platform for broadband, spectra-fitted, tissue optical phantoms. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:025001. [PMID: 36814953 PMCID: PMC9940728 DOI: 10.1117/1.jbo.28.2.025001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
SIGNIFICANCE Current methods of producing optical phantoms are incapable of accurately capturing the wavelength-dependent properties of tissue critical for many optical modalities. AIM We aim to introduce a method of producing solid, inorganic phantoms whose wavelength-dependent optical properties can be matched to those of tissue over the wavelength range of 370 to 950 nm. APPROACH The concentration-dependent optical properties of 20 pigments were characterized and used to determine combinations that result in optimal fits compared to the target properties over the full spectrum. Phantoms matching the optical properties of muscle and nerve, the diffuse reflectance of pale and melanistic skin, and the chromophore concentrations of a computational skin model with varying oxygen saturation ( StO 2 ) were made with this method. RESULTS Both optical property phantoms were found to accurately mimic their respective tissues' absorption and scattering properties across the entire spectrum. The diffuse reflectance phantoms were able to closely approximate skin reflectance regardless of skin type. All three computational skin phantoms were found to have emulated chromophore concentrations close to the model, with an average percent error for the StO 2 of 4.31%. CONCLUSIONS This multipigment phantom platform represents a powerful tool for creating spectrally accurate tissue phantoms, which should increase the availability of standards for many optical techniques.
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Affiliation(s)
- Alec B. Walter
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
- Vanderbilt University, Biophotonics Center, Nashville, Tennessee, United States
| | - E. Duco Jansen
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
- Vanderbilt University, Biophotonics Center, Nashville, Tennessee, United States
- Vanderbilt University Medical Center, Department of Neurosurgery, Nashville, Tennessee, United States
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Majedy M, Das NK, Johansson J, Saager RB. Influence of optical aberrations on depth-specific spatial frequency domain techniques. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:116003. [PMID: 36358008 PMCID: PMC9646941 DOI: 10.1117/1.jbo.27.11.116003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
SIGNIFICANCE Spatial frequency domain imaging (SFDI) and spatial frequency domain spectroscopy (SFDS) are emerging tools to non-invasively assess tissues. However, the presence of aberrations can complicate processing and interpretation. AIM This study develops a method to characterize optical aberrations when performing SFDI/S measurements. Additionally, we propose a post-processing method to compensate for these aberrations and recover arbitrary subsurface optical properties. APPROACH Using a custom SFDS system, we extract absorption and scattering coefficients from a reference phantom at 0 to 15 mm distances from the ideal focus. In post-processing, we characterize aberrations in terms of errors in absorption and scattering relative to the expected in-focus values. We subsequently evaluate a compensation approach in multi-distance measurements of phantoms with different optical properties and in multi-layer phantom constructs to mimic subsurface targets. RESULTS Characterizing depth-specific aberrations revealed a strong power law such as wavelength dependence from ∼40 to ∼10 % error in both scattering and absorption. When applying the compensation method, scattering remained within 1.3% (root-mean-square) of the ideal values, independent of depth or top layer thickness, and absorption remained within 3.8%. CONCLUSIONS We have developed a protocol that allows for instrument-specific characterization and compensation for the effects of defocus and chromatic aberrations on spatial frequency domain measurements.
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Affiliation(s)
- Motasam Majedy
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Nandan K. Das
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Johannes Johansson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Rolf B. Saager
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
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