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Kumar P, Dhara S, Gope A, Chatterjee J, Mandal S. Deep Learning based Skin-layer Segmentation for Characterizing Cutaneous Wounds from Optical Coherence Tomography Images. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2023; 2023:1-4. [PMID: 38083666 DOI: 10.1109/embc40787.2023.10340321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Optical coherence tomography (OCT) is a medical imaging modality that allows us to probe deeper sub-structures of skin. The state-of-the-art wound care prediction and monitoring methods are based on visual evaluation and focus on surface information. However, research studies have shown that sub-surface information of the wound is critical for understanding the wound healing progression. This work demonstrated the use of OCT as an effective imaging tool for objective and non-invasive assessments of wound severity, the potential for healing, and healing progress by measuring the optical characteristics of skin components. We have demonstrated the efficacy of OCT in studying wound healing progress in vivo small animal models. Automated analysis of OCT datasets poses multiple challenges, such as limitations in the training dataset size, variation in data distribution induced by uncertainties in sample quality and experiment conditions. We have employed a U-Net-based model for segmentation of skin layers based on OCT images and to study epithelial and regenerated tissue thickness wound closure dynamics and thus quantify the progression of wound healing. In the experimental evaluation of the OCT skin image datasets, we achieved the objective of skin layer segmentation with an average intersection over union (IOU) of 0.9234. The results have been corroborated using gold-standard histology images and co-validated using inputs from pathologists.Clinical Relevance-To monitor wound healing progression without disrupting the healing procedure by superficial, non-invasive means via the identification of pixel characteristics of individual layers.
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Ten Voorde W, Saghari M, Boltjes J, de Kam ML, Zhuparris A, Feiss G, Buters TP, Prens EP, Damman J, Niemeyer-van der Kolk T, Moerland M, Burggraaf J, van Doorn MBA, Rissmann R. A multimodal, comprehensive characterization of a cutaneous wound model in healthy volunteers. Exp Dermatol 2023. [PMID: 37051698 DOI: 10.1111/exd.14808] [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: 11/18/2022] [Revised: 03/13/2023] [Accepted: 03/20/2023] [Indexed: 04/14/2023]
Abstract
Development of pharmacological interventions for wound treatment is challenging due to both poorly understood wound healing mechanisms and heterogeneous patient populations. A standardized and well-characterized wound healing model in healthy volunteers is needed to aid in-depth pharmacodynamic and efficacy assessments of novel compounds. The current study aims to objectively and comprehensively characterize skin punch biopsy-induced wounds in healthy volunteers with an integrated, multimodal test battery. Eighteen (18) healthy male and female volunteers received three biopsies on the lower back, which were left to heal without intervention. The wound healing process was characterized using a battery of multimodal, non-invasive methods as well as histology and qPCR analysis in re-excised skin punch biopsies. Biophysical and clinical imaging read-outs returned to baseline values in 28 days. Optical coherence tomography detected cutaneous differences throughout the wound healing progression. qPCR analysis showed involvement of proteins, quantified as mRNA fold increase, in one or more healing phases. All modalities used in the study were able to detect differences over time. Using multidimensional data visualization, we were able to create a distinction between wound healing phases. Clinical and histopathological scoring were concordant with non-invasive imaging read-outs. This well-characterized wound healing model in healthy volunteers will be a valuable tool for the standardized testing of novel wound healing treatments.
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Affiliation(s)
- Wouter Ten Voorde
- Centre for Human Drug Research, Leiden, the Netherlands
- Leiden University Medical Centre, Leiden, the Netherlands
| | - Mahdi Saghari
- Centre for Human Drug Research, Leiden, the Netherlands
- Leiden University Medical Centre, Leiden, the Netherlands
| | - Jiry Boltjes
- Centre for Human Drug Research, Leiden, the Netherlands
| | | | | | - Gary Feiss
- Cutanea Life Sciences, Wayne, Pennsylvania, USA
| | - Thomas P Buters
- Centre for Human Drug Research, Leiden, the Netherlands
- Leiden University Medical Centre, Leiden, the Netherlands
| | - Errol P Prens
- Department of Dermatology Erasmus Medical Centre, Rotterdam, the Netherlands
| | - Jeffrey Damman
- Department of Pathology Erasmus Medical Centre, Rotterdam, the Netherlands
| | | | | | - Jacobus Burggraaf
- Centre for Human Drug Research, Leiden, the Netherlands
- Leiden University Medical Centre, Leiden, the Netherlands
- Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
| | | | - Robert Rissmann
- Centre for Human Drug Research, Leiden, the Netherlands
- Leiden University Medical Centre, Leiden, the Netherlands
- Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
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Tran MH, Fei B. Compact and ultracompact spectral imagers: technology and applications in biomedical imaging. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:040901. [PMID: 37035031 PMCID: PMC10075274 DOI: 10.1117/1.jbo.28.4.040901] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 02/27/2023] [Indexed: 05/18/2023]
Abstract
Significance Spectral imaging, which includes hyperspectral and multispectral imaging, can provide images in numerous wavelength bands within and beyond the visible light spectrum. Emerging technologies that enable compact, portable spectral imaging cameras can facilitate new applications in biomedical imaging. Aim With this review paper, researchers will (1) understand the technological trends of upcoming spectral cameras, (2) understand new specific applications that portable spectral imaging unlocked, and (3) evaluate proper spectral imaging systems for their specific applications. Approach We performed a comprehensive literature review in three databases (Scopus, PubMed, and Web of Science). We included only fully realized systems with definable dimensions. To best accommodate many different definitions of "compact," we included a table of dimensions and weights for systems that met our definition. Results There is a wide variety of contributions from industry, academic, and hobbyist spaces. A variety of new engineering approaches, such as Fabry-Perot interferometers, spectrally resolved detector array (mosaic array), microelectro-mechanical systems, 3D printing, light-emitting diodes, and smartphones, were used in the construction of compact spectral imaging cameras. In bioimaging applications, these compact devices were used for in vivo and ex vivo diagnosis and surgical settings. Conclusions Compact and ultracompact spectral imagers are the future of spectral imaging systems. Researchers in the bioimaging fields are building systems that are low-cost, fast in acquisition time, and mobile enough to be handheld.
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Affiliation(s)
- Minh H. Tran
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
| | - Baowei Fei
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
- University of Texas Southwestern Medical Center, Department of Radiology, Dallas, Texas, United States
- University of Texas at Dallas, Center for Imaging and Surgical Innovation, Richardson, Texas, United States
- Address all correspondence to Baowei Fei,
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Chen Z, Cheng Q, Wang L, Mo Y, Li K, Mo J. Optical coherence tomography for in vivo longitudinal monitoring of artificial dermal scaffold. Lasers Surg Med 2023; 55:316-326. [PMID: 36806261 DOI: 10.1002/lsm.23645] [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: 08/08/2022] [Revised: 01/26/2023] [Accepted: 01/28/2023] [Indexed: 02/21/2023]
Abstract
OBJECTIVES Artificial dermal scaffold (ADS) has undergone rapid development and been increasingly used for treating skin wound in clinics due to its good biocompatibility, controllable degradation, and low risk of disease infection. To obtain good treatment efficacy, ADS needs to be monitored longitudinally during the treatment process. For example, scaffold-tissue fit, cell in-growth, vascular regeneration, and scaffold degradation are the key properties to be inspected. However, to date, there are no effective, real-time, and noninvasive techniques to meet the requirement of the scaffold monitoring above. MATERIALS AND METHODS In this study, we propose to use optical coherence tomography (OCT) to monitor ADS in vivo through three-dimensional imaging. A swept source OCT system with a handheld probe was developed for in vivo skin imaging. Moreover, a cell in-growth, vascular regeneration, and scaffold degradation rate (IRDR) was defined with the volume reduction rate of the scaffold's collagen sponge layer. To measure the IRDR, a semiautomatic image segmentation algorithm was designed based on U-Net to segment the collagen sponge layer of the scaffold from OCT images. RESULTS The results show that the scaffold-tissue fit can be clearly visualized under OCT imaging. The IRDR can be computed based on the volume of the segmented collagen sponge layer. It is observed that the IRDR appeared to a linear function of the time and in addition, the IRDR varied among different skin parts. CONCLUSION Overall, it can be concluded that OCT has a good potential to monitor ADS in vivo. This can help guide the clinicians to control the treatment with ADS to improve the therapy.
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Affiliation(s)
- Ziye Chen
- Department of Electronic Information, Engineering School of Electronics and Information Engineering, Soochow University, Suzhou, China
| | - Qiong Cheng
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Lingyun Wang
- Department of Electronic Information, Engineering School of Electronics and Information Engineering, Soochow University, Suzhou, China
| | - Yunfeng Mo
- Department of Electronic Information, Engineering School of Electronics and Information Engineering, Soochow University, Suzhou, China
| | - Ke Li
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Jianhua Mo
- Department of Electronic Information, Engineering School of Electronics and Information Engineering, Soochow University, Suzhou, China
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Advances in Medical Imaging for Wound Repair and Regenerative Medicine. Regen Med 2023. [DOI: 10.1007/978-981-19-6008-6_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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Xu W, Ceylan Koydemir H. Non-invasive biomedical sensors for early detection and monitoring of bacterial biofilm growth at the point of care. LAB ON A CHIP 2022; 22:4758-4773. [PMID: 36398687 DOI: 10.1039/d2lc00776b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Bacterial infections have long been a serious global health issue. Biofilm formation complicates matters even more. The biofilm's extracellular polymeric substances (EPSs) matrix protects bacteria from the host's immune responses, yielding strong adhesion and drug resistance as the biofilm matures. Early bacterial biofilm detection and bacterial biofilm growth monitoring are crucial to treating biofilm-associated infections. Current detection methods are highly sensitive but not portable, are time-consuming, and require expensive equipment and complex operating procedures, limiting their use at the point of care. Therefore, there is an urgent need to develop affordable, on-body, and non-invasive biomedical sensors to continuously monitor and detect early biofilm growth at the point of care through personalized telemedicine. Herein, recent advances in developing non-invasive biomedical sensors for early detection and monitoring bacterial biofilm growth are comprehensively reviewed. First, biofilm's life cycle and its impact on the human body, such as biofilm-associated disease and infected medical devices, are introduced together with the challenges of biofilm treatment. Then, the current methods used in clinical and laboratory settings for biofilm detection and their challenges are discussed. Next, the current state of non-invasive sensors for direct and indirect detection of bacterial biofilms are summarized and highlighted with the detection parameters and their design details. Finally, commercially available products, challenges of current devices, and the further trend in biofilm detection sensors are discussed.
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Affiliation(s)
- Weiming Xu
- Department of Biomedical Engineering, Texas A&M University, College Station, 77843, Texas, USA.
- Center for Remote Health Technologies and Systems, Texas A&M Engineering Experiment Station, College Station, 77843, TX, USA
| | - Hatice Ceylan Koydemir
- Department of Biomedical Engineering, Texas A&M University, College Station, 77843, Texas, USA.
- Center for Remote Health Technologies and Systems, Texas A&M Engineering Experiment Station, College Station, 77843, TX, USA
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Automatic Segmentation of Laser-Induced Injury OCT Images Based on a Deep Neural Network Model. Int J Mol Sci 2022; 23:ijms231911079. [PMID: 36232378 PMCID: PMC9570418 DOI: 10.3390/ijms231911079] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/13/2022] [Accepted: 09/18/2022] [Indexed: 11/16/2022] Open
Abstract
Optical coherence tomography (OCT) has considerable application potential in noninvasive diagnosis and disease monitoring. Skin diseases, such as basal cell carcinoma (BCC), are destructive; hence, quantitative segmentation of the skin is very important for early diagnosis and treatment. Deep neural networks have been widely used in the boundary recognition and segmentation of diseased areas in medical images. Research on OCT skin segmentation and laser-induced skin damage segmentation based on deep neural networks is still in its infancy. Here, a segmentation and quantitative analysis pipeline of laser skin injury and skin stratification based on a deep neural network model is proposed. Based on the stratification of mouse skins, a laser injury model of mouse skins induced by lasers was constructed, and the multilayer structure and injury areas were accurately segmented by using a deep neural network method. First, the intact area of mouse skin and the damaged areas of different laser radiation doses are collected by the OCT system, and then the labels are manually labeled by experienced histologists. A variety of deep neural network models are used to realize the segmentation of skin layers and damaged areas on the skin dataset. In particular, the U-Net model based on a dual attention mechanism is used to realize the segmentation of the laser-damage structure, and the results are compared and analyzed. The segmentation results showed that the Dice coefficient of the mouse dermis layer and injury area reached more than 0.90, and the Dice coefficient of the fat layer and muscle layer reached more than 0.80. In the evaluation results, the average surface distance (ASSD) and Hausdorff distance (HD) indicated that the segmentation results are excellent, with a high overlap rate with the manually labeled area and a short edge distance. The results of this study have important application value for the quantitative analysis of laser-induced skin injury and the exploration of laser biological effects and have potential application value for the early noninvasive detection of diseases and the monitoring of postoperative recovery in the future.
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Ji Y, Yang S, Zhou K, Lu J, Wang R, Rocliffe HR, Pellicoro A, Cash JL, Li C, Huang Z. Semisupervised representative learning for measuring epidermal thickness in human subjects in optical coherence tomography by leveraging datasets from rodent models. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:085002. [PMID: 35982528 PMCID: PMC9388694 DOI: 10.1117/1.jbo.27.8.085002] [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: 02/13/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE Morphological changes in the epidermis layer are critical for the diagnosis and assessment of various skin diseases. Due to its noninvasiveness, optical coherence tomography (OCT) is a good candidate for observing microstructural changes in skin. Convolutional neural network (CNN) has been successfully used for automated segmentation of the skin layers of OCT images to provide an objective evaluation of skin disorders. Such method is reliable, provided that a large amount of labeled data is available, which is very time-consuming and tedious. The scarcity of patient data also puts another layer of difficulty to make the model more generalizable. AIM We developed a semisupervised representation learning method to provide data augmentations. APPROACH We used rodent models to train neural networks for accurate segmentation of clinical data. RESULT The learning quality is maintained with only one OCT labeled image per volume that is acquired from patients. Data augmentation introduces a semantically meaningful variance, allowing for better generalization. Our experiments demonstrate the proposed method can achieve accurate segmentation and thickness measurement of the epidermis. CONCLUSION This is the first report of semisupervised representative learning applied to OCT images from clinical data by making full use of the data acquired from rodent models. The proposed method promises to aid in the clinical assessment and treatment planning of skin diseases.
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Affiliation(s)
- Yubo Ji
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Shufan Yang
- Edinburgh Napier University, School of Computing, Edinburgh, United Kingdom
- University of Glasgow, Center of Medical and Industrial Ultrasonics, Glasgow, United Kingdom
| | - Kanheng Zhou
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Jie Lu
- University of Washington, Department of Bioengineering, Seattle, Washington, United States
| | - Ruikang Wang
- University of Washington, Department of Bioengineering, Seattle, Washington, United States
| | - Holly R. Rocliffe
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Antonella Pellicoro
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Jenna L. Cash
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Chunhui Li
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Zhihong Huang
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
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Ud-Din S, Bayat A. Classification of Distinct Endotypes in Human Skin Scarring: S.C.A.R.-A Novel Perspective on Dermal Fibrosis. Adv Wound Care (New Rochelle) 2022; 11:109-120. [PMID: 33677998 PMCID: PMC8742286 DOI: 10.1089/wound.2020.1364] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Significance: Skin scarring is a permanent, irreversible end point of cutaneous injury. However, not everyone will acquire the same exact scar type. Skin scarring is generally recognized as complex with significant variability in individuals' scar type and response to treatment. Despite these tangible differences in treatment response, to date there has been no simplified approach in defining spectrum of skin scarring in relation to prediction and outcome post-treatment. Thus, in this study we propose that skin scarring consists of distinct endotypes, which is characterized by their specific pathology. Four distinct scar endotypes can be observed: (1) Stretched (flat), (2) Contracted, (3) Atrophic (depressed), and (4) Raised scarring, which can be abbreviated to S.C.A.R. endotypes. Each of these endotypes can certainly include subphenotypes and each phenotype can be present in more than one endotype. To define these endotypes, we also present a structured approach in assessment of all relevant parameters in skin scar evaluation including clinical (scar symptoms and signs) and nonclinical parameters (device measurements of structural, mechanical, and physiological properties of scars as well as gene and protein laboratory studies). Recent Advances: Scars can be phenotypically characterized based on a multitude of parameters assessed; however, not all scar types will share all the same characteristics. This leads to the question of whether skin scarring is a single disease entity with varying phenotypic characteristics or should be classed as several disease entities that have certain similar parameters. We suggest the latter and propose distinct scarring phenotypes arise mainly owing to genetic and environmental susceptibilities associated with the development of each specific scar endotype. Characteristic features of skin scarring, however, can be objectively and quantitively evaluated and used as an aid in the theranostic goal-directed management of scarring. Critical Issues: The concept of identifying different endotypes is key in formulating personalized treatments with improved outcomes beyond what is achieved with current nonspecific approaches in scar management. This approach has gained interest and significant traction in several other medical conditions including asthma, rheumatoid arthritis, and atopic dermatitis. Future Directions: To begin identifying distinct endotypic features in skin scarring, it is important to have a better understanding of underlying pathological mechanisms leading to further insight into the heterogeneous nature of skin scarring endotypes. This approach may lead to improved theranostic outcomes and further understanding of the pathophysiology of the complex nature of human skin scarring.
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Affiliation(s)
- Sara Ud-Din
- Plastic and Reconstructive Surgery Research, NIHR Manchester Biomedical Research Centre, University of Manchester, Manchester, England, United Kingdom
| | - Ardeshir Bayat
- Plastic and Reconstructive Surgery Research, NIHR Manchester Biomedical Research Centre, University of Manchester, Manchester, England, United Kingdom.,Medical Research Council—South Africa Wound Healing Unit, Division of Dermatology, University of Cape Town, Cape Town, South Africa.,Correspondence: Medical Research Council—South Africa Wound Healing Unit, Division of Dermatology, University of Cape Town, 7925, Cape Town, South Africa.
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Ji Y, Yang S, Zhou K, Rocliffe HR, Pellicoro A, Cash JL, Wang R, Li C, Huang Z. Deep-learning approach for automated thickness measurement of epithelial tissue and scab using optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:015002. [PMID: 35043611 PMCID: PMC8765552 DOI: 10.1117/1.jbo.27.1.015002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 11/23/2021] [Indexed: 10/29/2023]
Abstract
SIGNIFICANCE In order to elucidate therapeutic treatment to accelerate wound healing, it is crucial to understand the process underlying skin wound healing, especially re-epithelialization. Epidermis and scab detection is of importance in the wound healing process as their thickness is a vital indicator to judge whether the re-epithelialization process is normal or not. Since optical coherence tomography (OCT) is a real-time and non-invasive imaging technique that can perform a cross-sectional evaluation of tissue microstructure, it is an ideal imaging modality to monitor the thickness change of epidermal and scab tissues during wound healing processes in micron-level resolution. Traditional segmentation on epidermal and scab regions was performed manually, which is time-consuming and impractical in real time. AIM We aim to develop a deep-learning-based skin layer segmentation method for automated quantitative assessment of the thickness of in vivo epidermis and scab tissues during a time course of healing within a rodent model. APPROACH Five convolution neural networks were trained using manually labeled epidermis and scab regions segmentation from 1000 OCT B-scan images (assisted by its corresponding angiographic information). The segmentation performance of five segmentation architectures was compared qualitatively and quantitatively for validation set. RESULTS Our results show higher accuracy and higher speed of the calculated thickness compared with human experts. The U-Net architecture represents a better performance than other deep neural network architectures with 0.894 at F1-score, 0.875 at mean intersection over union, 0.933 at Dice similarity coefficient, and 18.28 μm at an average symmetric surface distance. Furthermore, our algorithm is able to provide abundant quantitative parameters of the wound based on its corresponding thickness maps in different healing phases. Among them, normalized epidermal thickness is recommended as an essential hallmark to describe the re-epithelialization process of the rodent model. CONCLUSIONS The automatic segmentation and thickness measurements within different phases of wound healing data demonstrates that our pipeline provides a robust, quantitative, and accurate method for serving as a standard model for further research into effect of external pharmacological and physical factors.
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Affiliation(s)
- Yubo Ji
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Shufan Yang
- Edinburgh Napier University, School of Computing, Edinburgh, United Kingdom
- University of Glasgow, Center of Medical and Industrial Ultrasonics, Glasgow, United Kingdom
| | - Kanheng Zhou
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Holly R. Rocliffe
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Antonella Pellicoro
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Jenna L. Cash
- The University of Edinburgh, The Queen’s Medical Research Institute, MRC Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Ruikang Wang
- University of Washington, Department of Bioengineering, Seattle, Washington, United States
| | - Chunhui Li
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
| | - Zhihong Huang
- University of Dundee, School of Science and Engineering, Dundee, United Kingdom
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Kim S, Le VH, Kim B, Kim CJ, Im SH, Kim KH. Longitudinal Label-Free Two-Photon Microscopy of Cellular Healing Processes in Non-Ablative Fractional Laser Wounds. Lasers Surg Med 2021; 53:1413-1426. [PMID: 34139024 DOI: 10.1002/lsm.23445] [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: 11/03/2020] [Revised: 05/26/2021] [Accepted: 05/31/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND OBJECTIVES Wound healing is an important biomedical problem with various associated complications. Although cutaneous wound healing has been studied in vivo extensively using various optical imaging methods, early-stage cellular healing processes were difficult to study due to scab formation. The objective of this study is to demonstrate that minimal laser wounds and optical microscopy can access the detailed cellular healing processes of cutaneous wounds from the early stage. STUDY DESIGN/MATERIALS AND METHODS A non-ablative fractional laser (NAFL) and label-free two-photon microscopy (TPM) were used to induce minimal cutaneous wounds and to image the wounds in three-dimension. Sixteen hairless mice and a single human volunteer were used. NAFL wounds were induced in the hindlimb skin of the mice and in the forearm skin of the human subject. The NAFL wounds were longitudinally imaged during the healing period, starting from an hour post wound induction in the earliest and until 21 days. Cells in the wound and surrounding normal skin were visualized based on two-photon excited auto-fluorescence (TPAF), and cellular changes were tracked by analyzing longitudinal TPM images both qualitatively and quantitatively. Damage and recovery in the skin dermis were tracked by using the second harmonic generation (SHG) signal of collagen. Immunofluorescence and hematoxylin and eosin histology analysis were conducted to validate the TPM results of the murine skin. RESULTS Cellular healing processes in NAFL wounds and surroundings could be observed by longitudinal TPM. In the case of murine skin, various healing phases including inflammation, re-epithelization, granulation tissue formation, and late remodeling phase including collagen regeneration were observed in the same wounds owing to minimal or no scab formation. The re-epithelization process was analyzed quantitatively by measuring cell density and thickness of the epithelium in the wound surroundings. In the case of the human skin, the access inside the wound was blocked for a few days post wound induction due to scabs but the cellular changes in the wound surroundings were observed from the early stage. Cellular healing processes in the NAFL wound of the human skin were similar to those in murine skin. CONCLUSIONS The minimal NAFL wound model and label-free TPM demonstrated the cell level assessment of wound healing processes with applicability to human subjects. © 2021 Wiley Periodicals LLC.
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Affiliation(s)
- Seonghan Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Viet-Hoan Le
- Department of Life Sciences & Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Bumju Kim
- Department of Life Sciences & Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Chan Johng Kim
- Department of Life Sciences & Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Sin-Hyeog Im
- Department of Life Sciences & Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea.,ImmunoBiome Inc. Bio Open Innovation Center, 47 Jigok-ro, Nam-gu, Pohang, Gyeongbukdo, 37673, Republic of Korea
| | - Ki Hean Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
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Abstract
Wound care is a multidisciplinary field with significant economic burden to our healthcare system. Not only does wound care cost the US healthcare system $20 billion annually, but wounds also remarkably impact the quality of life of patients; wounds pose significant risk of mortality, as the five-year mortality rate for diabetic foot ulcers (DFUs) and ischemic ulcers is notably higher compared to commonly encountered cancers such as breast and prostate. Although it is important to measure how wounds may or may not be improving over time, the only relative "marker" for this is wound area measurement-area measurements can help providers determine if a wound is on a healing or non-healing trajectory. Because wound area measurements are currently the only readily available "gold standard" for predicting healing outcomes, there is a pressing need to understand how other relative biomarkers may play a role in wound healing. Currently, wound care centers across the nation employ various techniques to obtain wound area measurements; length and width of a wound can be measured with a ruler, but this carries a high amount of inter- and intrapersonal error as well as uncertainty. Acetate tracings could be used to limit the amount of error but do not account for depth, thereby making them inaccurate. Here, we discuss current imaging modalities and how they can serve to accurately measure wound size and serve as useful adjuncts in wound assessment. Moreover, new imaging modalities are also discussed and how up-and-coming technologies can provide important information on "biomarkers" for wound healing.
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13
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Ghosh B, Mandal M, Mitra P, Chatterjee J. Attenuation corrected-optical coherence tomography for quantitative assessment of skin wound healing and scar morphology. JOURNAL OF BIOPHOTONICS 2021; 14:e202000357. [PMID: 33332734 DOI: 10.1002/jbio.202000357] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 12/14/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
Imaging the structural modifications of underlying tissues is vital to monitor wound healing. Optical coherence tomography (OCT) images high-resolution sub-surface information, but suffers a loss of intensity with depth, limiting quantification. Hence correcting the attenuation loss is important. We performed swept source-OCT of full-thickness excision wounds for 300 days in mice skin. We used single-scatter attenuation models to determine and correct the attenuation loss in the images. The phantom studies established the correspondence of corrected-OCT intensity (reflectivity) with matrix density and hydration. We histologically validated the corrected-OCT and measured the wound healing rate. We noted two distinct phases of healing-rapid and steady-state. We also detected two compartments in normal scars using corrected OCT that otherwise were not visible in the OCT scans. The OCT reflectivity in the scar compartments corresponded to distinct cell populations, mechanical properties and composition. OCT reflectivity has potential applications in evaluating the therapeutic efficacy of healing and characterizing scars.
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Affiliation(s)
- Biswajoy Ghosh
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Mousumi Mandal
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Pabitra Mitra
- Department of Computer Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Jyotirmoy Chatterjee
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, India
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14
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Liu W, Ou-Yang W, Zhang C, Wang Q, Pan X, Huang P, Zhang C, Li Y, Kong D, Wang W. Synthetic Polymeric Antibacterial Hydrogel for Methicillin-Resistant Staphylococcus aureus-Infected Wound Healing: Nanoantimicrobial Self-Assembly, Drug- and Cytokine-Free Strategy. ACS NANO 2020; 14:12905-12917. [PMID: 32946218 DOI: 10.1021/acsnano.0c03855] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Antibacterial hydrogels are attracting extensive attention in soft tissue repair and regeneration, including bacteria-infected-wound healing. The abuse of antibiotics leads to drug resistance. Recent developments have demonstrated that the delivery of inorganic bactericidal agents in hydrogels can drive the wound healing process; however, this approach is complicated by external light stimuli, cytotoxicity, nondegradability, and sophisticated fabrication. Herein, an inherent antibacterial, bioresorbable hydrogel was developed by the spontaneous self-aggregation of amphiphilic, oxadiazole-group-decorated quaternary ammonium salts (QAS)-conjugated poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) (PCEC-QAS) micellar nanoantimicrobials for methicillin-resistant Staphylococcus aureus (MRSA)-infected cutaneous wound healing. The PCEC-QAS hydrogel showed a stable gel state within the temperature range of 5-50 °C and antibacterial efficacy against both Gram-negative and -positive bacteria in vitro and in vivo. Additionally, the PCEC-QAS hydrogel facilitated the cell spreading, proliferation, and migration without cytotoxicity. An in vivo degradation and skin defect healing study suggested the PCEC-QAS hydrogel was totally absorbed without local or systemic toxicity and could promote wound repair in the absence of drugs, cytokines, or cells. Significantly, this hydrogel accelerated the regeneration of a MRSA-infected full-thickness impaired skin wound by successfully reconstructing an intact and thick epidermis similar to normal mouse skin. Collectively, a self-assembling PCEC-QAS antibacterial hydrogel is a promising dressing material to promote skin regeneration and prevent bacterial infection without additional drugs, cells, light irradiation, or delivery systems, providing a simple but effective strategy for treating dermal wounds.
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Affiliation(s)
- Wenshuai Liu
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Wenbin Ou-Yang
- Structural Heart Disease Center, National Center for Cardiovascular Disease, China and Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Chao Zhang
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Qiangsong Wang
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Xiangbin Pan
- Structural Heart Disease Center, National Center for Cardiovascular Disease, China and Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Pingsheng Huang
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Chuangnian Zhang
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Yuejie Li
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Deling Kong
- College of Life Sciences, Nankai University, Tianjin 300071, China
| | - Weiwei Wang
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
- Biomedical Barriers Research Center, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
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15
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Zharkikh E, Dremin V, Zherebtsov E, Dunaev A, Meglinski I. Biophotonics methods for functional monitoring of complications of diabetes mellitus. JOURNAL OF BIOPHOTONICS 2020; 13:e202000203. [PMID: 32654427 DOI: 10.1002/jbio.202000203] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/02/2020] [Accepted: 07/04/2020] [Indexed: 06/11/2023]
Abstract
The prevalence of diabetes complications is a significant public health problem with a considerable economic cost. Thus, the timely diagnosis of complications and prevention of their development will contribute to increasing the length and quality of patient life, and reducing the economic costs of their treatment. This article aims to review the current state-of-the-art biophotonics technologies used to identify the complications of diabetes mellitus and assess the quality of their treatment. Additionally, these technologies assess the structural and functional properties of biological tissues, and they include capillaroscopy, laser Doppler flowmetry and hyperspectral imaging, laser speckle contrast imaging, diffuse reflectance spectroscopy and imaging, fluorescence spectroscopy and imaging, optical coherence tomography, optoacoustic imaging and confocal microscopy. Recent advances in the field of optical noninvasive diagnosis suggest a wider introduction of biophotonics technologies into clinical practice and, in particular, in diabetes care units.
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Affiliation(s)
- Elena Zharkikh
- Research & Development Center of Biomedical Photonics, Orel State University, Orel, Russia
| | - Viktor Dremin
- Research & Development Center of Biomedical Photonics, Orel State University, Orel, Russia
- School of Engineering and Applied Science, Aston University, Birmingham, UK
| | - Evgeny Zherebtsov
- Research & Development Center of Biomedical Photonics, Orel State University, Orel, Russia
- Optoelectronics and Measurement Techniques unit, University of Oulu, Oulu, Finland
| | - Andrey Dunaev
- Research & Development Center of Biomedical Photonics, Orel State University, Orel, Russia
| | - Igor Meglinski
- School of Engineering and Applied Science, Aston University, Birmingham, UK
- Optoelectronics and Measurement Techniques unit, University of Oulu, Oulu, Finland
- Interdisciplinary Laboratory of Biophotonics, National Research Tomsk State University, Tomsk, Russia
- Institute of Engineering Physics for Biomedicine (PhysBio), National Research Nuclear University-MEPhI, Moscow, Russia
- School of Life and Health Sciences, Aston University, Birmingham, UK
- Department of Histology, Cytology and Embryology, Institute of Clinical Medicine N.V. Sklifosovsky, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
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16
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Ghosh B, Mandal M, Mitra P, Chatterjee J. Structural mechanics modeling reveals stress-adaptive features of cutaneous scars. Biomech Model Mechanobiol 2020; 20:371-377. [PMID: 32920729 DOI: 10.1007/s10237-020-01384-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 09/01/2020] [Indexed: 02/07/2023]
Abstract
The scar is a predominant outcome of adult mammalian wound healing despite being associated with partial function loss. Here in this paper, we have described the structure of a full-thickness normal scar as a "di-fork" with dual biomechanical compartments using in vivo and ex vivo experiments. We used structural mechanics simulations to model the deformation fields computationally and stress distribution in the scar in response to external forces. Despite its loss of tissue components, we have found that the scar has stress-adaptive features that cushion the underlying tissues from external mechanical impacts. Thus, this new finding can motivate research to understand the biomechanical advantages of a scar in maintaining the primary function of the skin, i.e., mechanical barrier despite permanent loss of some tissues and specialized functions.
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Affiliation(s)
- Biswajoy Ghosh
- School of Medical Science and Technology, IIT Kharagpur, Kharagpur, India.
| | - Mousumi Mandal
- School of Medical Science and Technology, IIT Kharagpur, Kharagpur, India
| | - Pabitra Mitra
- Department of Computer Science and Engineering, IIT Kharagpur, Kharagpur, India
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17
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Chen D, Yuan W, Park HC, Li X. In vivo assessment of vascular-targeted photodynamic therapy effects on tumor microvasculature using ultrahigh-resolution functional optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2020; 11:4316-4325. [PMID: 32923045 PMCID: PMC7449727 DOI: 10.1364/boe.397602] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/05/2020] [Accepted: 07/06/2020] [Indexed: 05/23/2023]
Abstract
Vascular-targeted photodynamic therapy (VTP) is an emerging treatment for tumors. The change of tumor vasculatures, including a newly-formed microvascular, in response to VTP, is a key assessment parameter for optimizing the treatment effect. However, an accurate assessment of vasculature, particularly the microvasculature's changes in vivo, remains challenging due to the limited resolution afforded by existing imaging modalities. In this study, we demonstrated the in vivo imaging of VTP effects on an A431 tumor-bearing window chamber model of a mouse with an 800-nm ultrahigh-resolution functional optical coherence tomography (UHR-FOCT). We further quantitatively demonstrated the effects of VTP on the size and density of tumor microvasculature before, during, and after the treatment. Our results suggest the promising potential of UHR-FOCT for assessing the tumor treatment with VTP in vivo and in real time to achieve an optimal outcome.
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Affiliation(s)
- Defu Chen
- School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
- These authors contributed equally to this work
| | - Wu Yuan
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- These authors contributed equally to this work
- Current address: Department of Biomedical Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Hyeon-Cheol Park
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Xingde Li
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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18
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Li S, Mohamedi AH, Senkowsky J, Nair A, Tang L. Imaging in Chronic Wound Diagnostics. Adv Wound Care (New Rochelle) 2020; 9:245-263. [PMID: 32226649 PMCID: PMC7099416 DOI: 10.1089/wound.2019.0967] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/14/2019] [Indexed: 01/18/2023] Open
Abstract
Significance: Chronic wounds affect millions of patients worldwide, placing a huge burden on health care resources. Although significant progress has been made in the development of wound treatments, very few advances have been made in wound diagnosis. Recent Advances: Standard imaging methods like computed tomography, single-photon emission computed tomography, magnetic resonance imaging, terahertz imaging, and ultrasound imaging have been widely employed in wound diagnostics. A number of noninvasive optical imaging modalities like optical coherence tomography, near-infrared spectroscopy, laser Doppler imaging, spatial frequency domain imaging, digital camera imaging, and thermal and fluorescence imaging have emerged over the years. Critical Issues: While standard diagnostic wound imaging modalities provide valuable information, they cannot account for dynamic changes in the wound environment. In addition, they lack the capability to predict the healing outcome. Thus, there remains a pressing need for more efficient methods that can not only indicate the current state of the wound but also help determine whether the wound is on track to heal normally. Future Directions: Many imaging probes have been fabricated and shown to provide real-time assessment of tissue microenvironment and inflammatory responses in vivo. These probes have been demonstrated to noninvasively detect various changes in the wound environment, which include tissue pH, reactive oxygen species, fibrin deposition, matrix metalloproteinase production, and macrophage accumulation. This review summarizes the creation of these probes and their potential implications in wound monitoring.
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Affiliation(s)
- Shuxin Li
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
| | - Ali H. Mohamedi
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
| | | | | | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
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19
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Owda AY, Salmon N, Shylo S, Owda M. Assessment of Bandaged Burn Wounds Using Porcine Skin and Millimetric Radiometry. SENSORS 2019; 19:s19132950. [PMID: 31277437 PMCID: PMC6651191 DOI: 10.3390/s19132950] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 06/30/2019] [Accepted: 07/02/2019] [Indexed: 11/16/2022]
Abstract
This paper describes the experimental setup and measurements of the emissivity of porcine skin samples over the band of 80–100 GHz. Measurements were conducted on samples with and without dressing materials and before and after the application of localized heat treatments. Experimental measurements indicate that the differences in the mean emissivity values between unburned skin and burned damaged skin was up to ~0.28, with an experimental measurement uncertainty of ±0.005. Measured differences in the mean emissivity values between unburned and burn damaged skin increases with the depth of the burn, indicating a possible non-contact technique for assessing the degree of a burn. The mean emissivity of the dressed burned skin was found to be slightly higher than the undressed burned skin, typically ~0.01 to ~0.02 higher. This indicates that the signature of the burn caused by the application of localized heat treatments is observable through dressing materials. These findings reveal that radiometry, as a non-contact method, is capable of distinguishing between normal and burn-damaged skin under dressing materials without their often-painful removal. This indicates the potential of using millimeter wave (MMW) radiometry as a new type of medical diagnostic to monitor burn wounds.
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Affiliation(s)
- Amani Yousef Owda
- School of Electrical and Electronic Engineering, University of Manchester, Sackville Street Building, Manchester M13 9PL, UK.
| | - Neil Salmon
- School of Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK
| | - Sergiy Shylo
- Usikov Institute of Radiophysics and Electronics National Academy of Sciences of Ukraine, 61085 Kharkov, Ukraine
| | - Majdi Owda
- School of Computing, Mathematics and Digital Technology, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK
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20
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RoyChoudhury S, Umasankar Y, Hutcheson JD, Lev-Tov HA, Kirsner RS, Bhansali S. Uricase Based Enzymatic Biosensor for Non-invasive Detection of Uric Acid by Entrapment in PVA-SbQ Polymer Matrix. ELECTROANAL 2018. [DOI: 10.1002/elan.201800360] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Sohini RoyChoudhury
- Department of Electrical and Computer Engineering; Florida International University; Miami, Florida 33174 United States E-mail address
| | - Yogeswaran Umasankar
- Biomolecular Sciences Institute; Florida International University Miami; Miami, Florida 33174 United States
| | - Joshua D. Hutcheson
- Department of Biomedical Engineering; Florida International University; Miami, Florida 33174 United States
| | - Hadar A. Lev-Tov
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami, FL
| | - Robert S. Kirsner
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami, FL
| | - Shekhar Bhansali
- Department of Electrical and Computer Engineering; Florida International University; Miami, Florida 33174 United States E-mail address
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21
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Zhang J, Yuan W, Liang W, Yu S, Liang Y, Xu Z, Wei Y, Li X. Automatic and robust segmentation of endoscopic OCT images and optical staining. BIOMEDICAL OPTICS EXPRESS 2017; 8:2697-2708. [PMID: 28663899 PMCID: PMC5480506 DOI: 10.1364/boe.8.002697] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 04/17/2017] [Accepted: 04/18/2017] [Indexed: 05/03/2023]
Abstract
We report a generic method for automatic segmentation of endoscopic optical coherence tomography (OCT) images. In this method, OCT images are first processed with L1 -L0 norm minimization based de-noising and smoothing algorithms to increase the signal-to-noise ratio (SNR) and enhance the contrast between adjacent layers. The smoothed images are then formulated into cost graphs based on their vertical gradients. After that, tissue-layer segmentation is performed with the shortest path search algorithm. The efficacy and capability of this method are demonstrated by automatically and robustly identifying all five interested layers of guinea pig esophagus from in vivo endoscopic OCT images. Furthermore, thanks to the ultrahigh resolution, high SNR of endoscopic OCT images and the high segmentation accuracy, this method permits in vivo optical staining histology and facilitates quantitative analysis of tissue geometric properties, which can be very useful for studying tissue pathologies and potentially aiding clinical diagnosis in real time.
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Affiliation(s)
- Jianlin Zhang
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
- These authors contributed equally to this work and should be considered co-first authors
| | - Wu Yuan
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
- These authors contributed equally to this work and should be considered co-first authors
| | - Wenxuan Liang
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Shanyong Yu
- Department of Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Yanmei Liang
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
- Institute of Modern Optics, Nankai University, Tianjin 300071, China
| | - Zhiyong Xu
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
| | - Yuxing Wei
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
| | - Xingde Li
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
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22
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Diagnostic and Prognostic Utility of Non-Invasive Multimodal Imaging in Chronic Wound Monitoring: a Systematic Review. J Med Syst 2017; 41:46. [PMID: 28194684 DOI: 10.1007/s10916-016-0679-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Accepted: 12/12/2016] [Indexed: 01/09/2023]
Abstract
Monitoring chronic wound [CW] healing is a challenging issue for clinicians across the world. Moreover, the health and cost burden of CW are escalating at a disturbing rate due to a global rise in population of elderly and diabetic cases. The conventional approach includes visual contour, sketches, or more rarely tracings. However, such conventional techniques bring forth infection, pain, allergies. Furthermore, these methods are subjective as well as time-consuming. As such, nowadays, non-touching and non-invasive CW monitoring system based on imaging techniques are gaining importance. They not only reduce patients' discomfort but also provide rapid wound diagnosis and prognosis. This review provides a survey of different types of CW characteristics, their healing mechanism and the multimodal non-invasive imaging methods that have been used for their diagnosis and prognosis. Current clinical practices as well as personal health systems [m-health and e-health] for CW monitoring have been discussed.
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23
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Tsai MT, Tsai TY, Shen SC, Ng CY, Lee YJ, Lee JD, Yang CH. Evaluation of Laser-Assisted Trans-Nail Drug Delivery with Optical Coherence Tomography. SENSORS (BASEL, SWITZERLAND) 2016; 16:E2111. [PMID: 27973451 PMCID: PMC5191091 DOI: 10.3390/s16122111] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/05/2016] [Accepted: 12/07/2016] [Indexed: 01/08/2023]
Abstract
The nail provides a functional protection to the fingertips and surrounding tissue from external injuries. The nail plate consists of three layers including dorsal, intermediate, and ventral layers. The dorsal layer consists of compact, hard keratins, limiting topical drug delivery through the nail. In this study, we investigate the application of fractional CO₂ laser that produces arrays of microthermal ablation zones (MAZs) to facilitate drug delivery in the nails. We utilized optical coherence tomography (OCT) for real-time monitoring of the laser-skin tissue interaction, sparing the patient from an invasive surgical sampling procedure. The time-dependent OCT intensity variance was used to observe drug diffusion through an induced MAZ array. Subsequently, nails were treated with cream and liquid topical drugs to investigate the feasibility and diffusion efficacy of laser-assisted drug delivery. Our results show that fractional CO₂ laser improves the effectiveness of topical drug delivery in the nail plate and that OCT could potentially be used for in vivo monitoring of the depth of laser penetration as well as real-time observations of drug delivery.
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Affiliation(s)
- Meng-Tsan Tsai
- Department of Electrical Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
- Medical Imaging Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital at Linkou, Taoyuan 33305, Taiwan.
- Department of Dermatology, Chang Gung Memorial Hospital, Linkou 33305, Taiwan.
| | - Ting-Yen Tsai
- Department of Electrical Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
| | - Su-Chin Shen
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou 33305, Taiwan.
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.
| | - Chau Yee Ng
- Department of Dermatology, Chang Gung Memorial Hospital, Linkou 33305, Taiwan.
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.
| | - Ya-Ju Lee
- Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei 11677, Taiwan.
| | - Jiann-Der Lee
- Department of Electrical Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
- Department of Neurosurgery, Chang Gung Memorial Hospital, LinKou 33305, Taiwan.
| | - Chih-Hsun Yang
- Department of Dermatology, Chang Gung Memorial Hospital, Linkou 33305, Taiwan.
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.
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24
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Jayachandran M, Rodriguez S, Solis E, Lei J, Godavarty A. Critical Review of Noninvasive Optical Technologies for Wound Imaging. Adv Wound Care (New Rochelle) 2016; 5:349-359. [PMID: 27602254 DOI: 10.1089/wound.2015.0678] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 03/08/2016] [Indexed: 01/08/2023] Open
Abstract
Significance: Noninvasive imaging approaches can provide greater information about a wound than visual inspection during the wound healing and treatment process. This review article focuses on various optical imaging techniques developed to image different wound types (more specifically ulcers). Recent Advances: The noninvasive optical imaging approaches in this review include hyperspectral imaging, multispectral imaging, near-infrared spectroscopy (NIRS), diffuse reflectance spectroscopy, optical coherence tomography, laser Doppler imaging, laser speckle imaging, spatial frequency domain imaging, and fluorescence imaging. The various wounds imaged using these techniques include open wounds, chronic wounds, diabetic foot ulcers, decubitus ulcers, venous leg ulcers, and burns. Preliminary work in the development and implementation of a near-infrared optical scanner for wound imaging as a noncontact hand-held device is briefly described. The technology is based on NIRS and has demonstrated its potential to differentiate a healing from nonhealing wound region. Critical Issues: While most of the optical imaging techniques can penetrate few hundred microns to a 1-2 mm from the wound surface, NIRS has the potential to penetrate deeper, demonstrating the potential to image internal wounds. Future Directions: All the technologies are currently at various stages of translational efforts to the clinic, with NIRS holding a greater promise for physiological assessment of the wounds internal, beyond the gold-standard visual assessment.
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Affiliation(s)
- Maanasa Jayachandran
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, Florida
| | - Suset Rodriguez
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, Florida
| | - Elizabeth Solis
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, Florida
| | - Jiali Lei
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, Florida
| | - Anuradha Godavarty
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, Florida
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25
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Ud-Din S, Bayat A. Non-invasive objective devices for monitoring the inflammatory, proliferative and remodelling phases of cutaneous wound healing and skin scarring. Exp Dermatol 2016; 25:579-85. [DOI: 10.1111/exd.13027] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2016] [Indexed: 12/29/2022]
Affiliation(s)
- Sara Ud-Din
- Plastic and Reconstructive Surgery Research; Institute of Inflammation and Repair; University of Manchester; Manchester UK
- University Hospital of South Manchester NHS Foundation Trust; Faculty of Medical and Human Sciences; Manchester Academic Health Science Centre; University of Manchester; Manchester UK
| | - Ardeshir Bayat
- Plastic and Reconstructive Surgery Research; Institute of Inflammation and Repair; University of Manchester; Manchester UK
- University Hospital of South Manchester NHS Foundation Trust; Faculty of Medical and Human Sciences; Manchester Academic Health Science Centre; University of Manchester; Manchester UK
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26
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Baran U, Choi WJ, Wang RK. Potential use of OCT-based microangiography in clinical dermatology. Skin Res Technol 2016; 22:238-246. [PMID: 26335451 PMCID: PMC4777681 DOI: 10.1111/srt.12255] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2015] [Indexed: 11/26/2022]
Abstract
BACKGROUND Optical coherence tomography (OCT) is a revolutionary imaging technique used commonly in ophthalmology, and on the way to become clinically viable alternative in dermatology due to its capability of acquiring histopathology level details of in vivo tissue, non-invasively. In this study, we demonstrate the capabilities of OCT-based microangiography in detecting high resolution, three-dimensional structural, and microvascular features of in vivo human skin with various conditions. METHODS A swept-source OCT system that operates on a central wavelength of 1310 nm with an A-line rate of 100 kHz is used in this study. We apply optical microangiography (OMAG) technique to visualize the structural and microvascular changes in tissue. RESULTS OMAG images provide detailed visualization of functional microvasculature of healthy human skin from cheek and forehead areas, abnormal skin conditions from face, chest and belly. Moreover, OMAG is capable of monitoring the progress of wound healing on human skin from arm, delivering unprecedented detail of microstructural and microvascular information during longitudinal wound healing process. CONCLUSION The presented results promise the clinical use of OCT angiography, aiming to treat prevalent cutaneous diseases, by detecting blood perfusion, and structural changes within human skin, in vivo.
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Affiliation(s)
- Utku Baran
- Department of Bioengineering, University of Washington, Seattle, WA, USA
- Department of Electrical Engineering, University of Washington, Seattle, WA, USA
| | - Woo June Choi
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Ruikang K. Wang
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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Ud‐Din S, Greaves NS, Sebastian A, Baguneid M, Bayat A. Noninvasive device readouts validated by immunohistochemical analysis enable objective quantitative assessment of acute wound healing in human skin. Wound Repair Regen 2015; 23:901-14. [DOI: 10.1111/wrr.12344] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 06/18/2015] [Indexed: 01/30/2023]
Affiliation(s)
- Sara Ud‐Din
- Plastic and Reconstructive Surgery Research, Manchester Institute of Biotechnology, University of ManchesterManchester United Kingdom
- University Hospital of South Manchester NHS Foundation Trust, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester, Manchester Academic Health Science CentreManchester United Kingdom
| | - Nicholas S. Greaves
- Plastic and Reconstructive Surgery Research, Manchester Institute of Biotechnology, University of ManchesterManchester United Kingdom
- University Hospital of South Manchester NHS Foundation Trust, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester, Manchester Academic Health Science CentreManchester United Kingdom
| | - Anil Sebastian
- Plastic and Reconstructive Surgery Research, Manchester Institute of Biotechnology, University of ManchesterManchester United Kingdom
| | - Mohamed Baguneid
- University Hospital of South Manchester NHS Foundation Trust, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester, Manchester Academic Health Science CentreManchester United Kingdom
| | - Ardeshir Bayat
- Plastic and Reconstructive Surgery Research, Manchester Institute of Biotechnology, University of ManchesterManchester United Kingdom
- University Hospital of South Manchester NHS Foundation Trust, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester, Manchester Academic Health Science CentreManchester United Kingdom
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Baran U, Li Y, Choi WJ, Kalkan G, Wang RK. High resolution imaging of acne lesion development and scarring in human facial skin using OCT-based microangiography. Lasers Surg Med 2015; 47:231-8. [PMID: 25740313 DOI: 10.1002/lsm.22339] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND AND OBJECTIVE Acne is a common skin disease that often leads to scarring. Collagen and other tissue damage from the inflammation of acne give rise to permanent skin texture and microvascular changes. In this study, we demonstrate the capabilities of optical coherence tomography-based microangiography in detecting high-resolution, three-dimensional structural, and microvascular features of in vivo human facial skin during acne lesion initiation and scar development. MATERIALS AND METHODS A real time swept source optical coherence tomography system is used in this study to acquire volumetric images of human skin. The system operates on a central wavelength of 1,310 nm with an A-line rate of 100 kHz, and with an extended imaging range (∼12 mm in air). The system uses a handheld imaging probe to image acne lesion on a facial skin of a volunteer. We utilize optical microangiography (OMAG) technique to evaluate the changes in microvasculature and tissue structure. RESULTS Thanks to the high sensitivity of OMAG, we are able to image microvasculature up to capillary level and visualize the remodeled vessels around the acne lesion. Moreover, vascular density change derived from OMAG measurement is provided as an alternative biomarker for the assessment of human skin diseases. In contrast to other techniques like histology or microscopy, our technique made it possible to image 3D tissue structure and microvasculature up to 1.5 mm depth in vivo without the need of exogenous contrast agents. CONCLUSIONS The presented results are promising to facilitate clinical trials aiming to treat acne lesion scarring, as well as other prevalent skin diseases, by detecting cutaneous blood flow and structural changes within human skin in vivo.
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Affiliation(s)
- Utku Baran
- Department of Bioengineering, University of Washington, Seattle, Washington; Department of Electrical Engineering, University of Washington, Seattle, Washington
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29
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Paul DW, Ghassemi P, Ramella-Roman JC, Prindeze NJ, Moffatt LT, Alkhalil A, Shupp JW. Noninvasive imaging technologies for cutaneous wound assessment: A review. Wound Repair Regen 2015; 23:149-62. [PMID: 25832563 DOI: 10.1111/wrr.12262] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 01/22/2015] [Indexed: 02/02/2023]
Abstract
The ability to phenotype wounds for the purposes of assessing severity, healing potential and treatment is an important function of evidence-based medicine. A variety of optical technologies are currently in development for noninvasive wound assessment. To varying extents, these optical technologies have the potential to supplement traditional clinical wound evaluation and research, by providing detailed information regarding skin components imperceptible to visual inspection. These assessments are achieved through quantitative optical analysis of tissue characteristics including blood flow, collagen remodeling, hemoglobin content, inflammation, temperature, vascular structure, and water content. Technologies that have, to this date, been applied to wound assessment include: near infrared imaging, thermal imaging, optical coherence tomography, orthogonal polarization spectral imaging, fluorescence imaging, laser Doppler imaging, microscopy, spatial frequency domain imaging, photoacoustic detection, and spectral/hyperspectral imaging. We present a review of the technologies in use or development for these purposes with three aims: (1) providing basic explanations of imaging technology concepts, (2) reviewing the wound imaging literature, and (3) providing insight into areas for further application and exploration. Noninvasive imaging is a promising advancement in wound assessment and all technologies require further validation.
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Affiliation(s)
- Dereck W Paul
- The Firefighters' Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC
| | - Pejhman Ghassemi
- Department of Electrical Engineering and Computer Science, The Catholic University of America, Washington, DC
| | - Jessica C Ramella-Roman
- Department of Biomedical Engineering and Herbert Wertheim College of Medicine, Florida International University, Miami, Florida
| | - Nicholas J Prindeze
- The Firefighters' Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC
| | - Lauren T Moffatt
- The Firefighters' Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC
| | - Abdulnaser Alkhalil
- The Firefighters' Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC
| | - Jeffrey W Shupp
- The Firefighters' Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC
- Department of Surgery, The Burn Center, MedStar Washington Hospital Center, Washington, DC
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30
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Koenig K. Hybrid multiphoton multimodal tomography of in vivo human skin. INTRAVITAL 2014. [DOI: 10.4161/intv.21938] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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31
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Greaves N, Benatar B, Whiteside S, Alonso-Rasgado T, Baguneid M, Bayat A. Optical coherence tomography: a reliable alternative to invasive histological assessment of acute wound healing in human skin? Br J Dermatol 2014; 170:840-50. [DOI: 10.1111/bjd.12786] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2013] [Indexed: 01/01/2023]
Affiliation(s)
- N.S. Greaves
- Plastic and Reconstructive Surgery Research; Manchester Institute of Biotechnology (MIB); University of Manchester; 131 Princess Road Manchester M1 7ND U.K
- University Hospital of South Manchester NHS Foundation Trust; Wythenshawe Hospital; Southmoor Road Manchester M23 9LT U.K
- School of Materials; University of Manchester; Manchester M13 9PL U.K
| | - B. Benatar
- Department of Histopathology; Royal Oldham Hospital; Pennine Acute Hospitals NHS Trust; Rochdale Road Oldham OL1 2JH U.K
| | - S. Whiteside
- University Hospital of South Manchester NHS Foundation Trust; Wythenshawe Hospital; Southmoor Road Manchester M23 9LT U.K
| | - T. Alonso-Rasgado
- Department of Histopathology; Royal Oldham Hospital; Pennine Acute Hospitals NHS Trust; Rochdale Road Oldham OL1 2JH U.K
| | - M. Baguneid
- University Hospital of South Manchester NHS Foundation Trust; Wythenshawe Hospital; Southmoor Road Manchester M23 9LT U.K
| | - A. Bayat
- Plastic and Reconstructive Surgery Research; Manchester Institute of Biotechnology (MIB); University of Manchester; 131 Princess Road Manchester M1 7ND U.K
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Alawi SA, Kuck M, Wahrlich C, Batz S, McKenzie G, Fluhr JW, Lademann J, Ulrich M. Optical coherence tomography for presurgical margin assessment of non-melanoma skin cancer - a practical approach. Exp Dermatol 2014; 22:547-51. [PMID: 23879814 DOI: 10.1111/exd.12196] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2013] [Indexed: 11/29/2022]
Abstract
In the clinical setting, optical coherence tomography (OCT) is applicable for the non-invasive diagnosis of skin cancer and may in particular be used for margin definition prior to excision. In this regard, OCT may improve the success rate of removing tumor lesions more effectively, preventing repetitive excision, which may subsequently result in smaller excisions. In this study, we have aimed to evaluate the applicability of OCT for in vivo presurgical margin assessment of non-melanocytic skin tumors (NMSC) and to describe the feasibility of different scanning techniques. A total number of 18 patients planned for excision of lesions suspicious of NMSC were included in this study. Based on OCT, we defined the specific tumor margins on 19 lesions preoperatively using different scanning modalities. Sixty-one margin points and five complete tumor margins were analysed on 18 patients with a total of 19 lesions including 63% basal cell carcinoma (BCC) (n = 12), 16% (n = 3) squamous cell carcinoma (SCC) and 21% of other types of skin tumors (n = 4) were classified. In 84% of the cases (n = 16), the OCT-defined lateral margins correctly indicated complete removal of the tumor. The surgical margins chosen by the surgeon never fell below the OCT-defined margin. Regarding the techniques of marginal definition, punctual tumor border scan in the perpendicular direction, with an extension of free-run scans for unsure cases can hardly be recommended. This study shows that suspected NMSC can effectively be confirmed, and furthermore, resection margin can be minimized under OCT control without reducing the rate of complete removal.
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Affiliation(s)
- Seyed Arash Alawi
- Department of Dermatology, Venereology and Allergology, Skin Cancer Centre Charité, Charité Campus Mitte, Charité-Universitätsmedizin Berlin, Berlin, Germany.
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Gong P, McLaughlin RA, Liew YM, Munro PRT, Wood FM, Sampson DD. Assessment of human burn scars with optical coherence tomography by imaging the attenuation coefficient of tissue after vascular masking. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:21111. [PMID: 24192908 DOI: 10.1117/1.jbo.19.2.021111] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 09/20/2013] [Indexed: 05/19/2023]
Abstract
The formation of burn-scar tissue in human skin profoundly alters, among other things, the structure of the dermis. We present a method to characterize dermal scar tissue by the measurement of the near-infrared attenuation coefficient using optical coherence tomography (OCT). To generate accurate en face parametric images of attenuation, we found it critical to first identify (using speckle decorrelation) and mask the tissue vasculature from the three-dimensional OCT data. The resulting attenuation coefficients in the vasculature-masked regions of the dermis of human burn-scar patients are lower in hypertrophic (3.8±0.4 mm(-1)) and normotrophic (4.2±0.9 mm(-1)) scars than in contralateral or adjacent normal skin (6.3±0.5 mm(-1)). Our results suggest that the attenuation coefficient of vasculature-masked tissue could be used as an objective means to assess human burn scars.
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Affiliation(s)
- Peijun Gong
- The University of Western Australia, School of Electrical, Electronic and Computer Engineering, Optical + Biomedical Engineering Laboratory, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
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Sahu K, Sharma M, Sharma P, Verma Y, Rao KD, Bansal H, Dube A, Gupta PK. Effect of poly-L-lysine-chlorin P6-mediated antimicrobial photodynamic treatment on collagen restoration in bacteria-infected wounds. Photomed Laser Surg 2013; 32:23-9. [PMID: 24359264 DOI: 10.1089/pho.2013.3577] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVE The purpose of this work was to study the effect of poly-L-lysine-conjugated chlorin P6 (pl-cp6)-mediated antimicrobial photodynamic treatment (APDT) on collagen remodeling of murine excisional wounds infected with methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa (PAO). BACKGROUND DATA Bacterial infection of wounds leads to compromised collagen remodelling. APDT-induced inactivation of bacteria and bacterial proteases are expected to restore collagen remodeling in wounds. However, published reports on the effect of PDT on wound healing are somewhat contradictory. One of the reasons for these observations could be the random sampling of wound repair outcomes by invasive technques such as histology. METHODS Post-wounding time-dependent changes in collagen restoration were monitored noninvasively using polarization sensitive optical coherence tomography (PSOCT) and compared with histology and hydroxyproline level. Immunoblotting was performed to study matrix metalloproteinase (MMP) level. RESULTS As indicated by retardance measurements from PSOCT images and immunoblotting, bacteria-infected wounds showed slower collagen restoration and higher MMP-8, 9 expression, than did uninfected wounds. In contrast, in infected wounds treated with pl-cp6 and light, retardance was higher (approximately twofold) compared with wounds treated with pl-cp6 alone. These results were consistent with lower MMP-8, 9 level on day 5, more ordered collagen matrix, and higher hydroxyproline content (approximately threefold) on day 18, observed in photodynamically treated wounds, compared with that of untreated infected wounds. CONCLUSIONS APDT expedites healing in bacteria-infected wounds in mice by attenuating collagen degradation and by enhancing epithelialization, hydroxyproline content, and collagen remodelling.
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Affiliation(s)
- Khageswar Sahu
- 1 Laser Biomedical Applications and Instrumentation Division , Raja Ramanna Centre for Advanced Technology, Madhya Pradesh, India
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Tsai MT, Yang CH, Shen SC, Lee YJ, Chang FY, Feng CS. Monitoring of wound healing process of human skin after fractional laser treatments with optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2013; 4:2362-75. [PMID: 24298400 PMCID: PMC3829533 DOI: 10.1364/boe.4.002362] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 09/27/2013] [Accepted: 10/01/2013] [Indexed: 05/28/2023]
Abstract
Fractional photothermolysis induced by non-ablative fractional lasers (NAFLs) or ablative fractional lasers (AFLs) can remodel the skin, regenerate collagen, and remove tumor tissue. However, fractional laser treatments may result in severe side effects, and multiple treatments are required to achieve the expected outcome. Thus, the treatment outcome and downtime after fractional laser treatments are key issues to determine the following treatment strategy. In this study, an optical coherence tomography (OCT) system was implemented for in vivo studies of wound healing after NAFL and AFL treatments. According to the OCT scanning results, the laser-induced photothermolysis including volatilization and coagulation could be morphologically identified. To continue monitoring the wound healing process, the treated regions were scanned with OCT at different time points, and the en-face images at various tissue depths were extracted from three-dimensional OCT images. Furthermore, to quantitatively evaluate the morphological changes at different tissue depths during wound healing, an algorithm was developed to distinguish the backscattering properties of untreated and treated tissues. The results showed that the coagulation damage induced by the NAFLs could be rapidly healed in 6 days. In contrast, the tissue volatilization induced by AFLs required a longer recovery time of 14 days. In conclusion, this study establishes the feasibility of this methodology as a means of clinically monitoring treatment outcomes and wound healing after fractional laser treatments.
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Affiliation(s)
- Meng-Tsan Tsai
- Department of Electrical Engineering, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, 33302 Taiwan
| | - Chih-Hsun Yang
- Department of Dermatology, Chang Gung Memorial Hospital, 5 Fusing Street, Kwei-Shan, Tao-Yaun 33302, Taiwan
- College of Medicine, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, 33302 Taiwan
| | - Su-Chin Shen
- Department of Ophthalmology, Chang Gung Memorial Hospital, 5 Fusing Street, Kwei-Shan, Tao-Yaun 33302, Taiwan
- College of Medicine, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, 33302 Taiwan
| | - Ya-Ju Lee
- Institute of Electro-Optical Science and Technology, National Taiwan Normal University, 88, Sec. 4, Ting-Chou Rd., Taipei 116, Taiwan
| | - Feng-Yu Chang
- Department of Electrical Engineering, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, 33302 Taiwan
| | - Cheng-Shin Feng
- Department of Electrical Engineering, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, 33302 Taiwan
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36
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Sattler ECE, Poloczek K, Kästle R, Welzel J. Confocal laser scanning microscopy and optical coherence tomography for the evaluation of the kinetics and quantification of wound healing after fractional laser therapy. J Am Acad Dermatol 2013; 69:e165-73. [DOI: 10.1016/j.jaad.2013.04.052] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 04/19/2013] [Accepted: 04/26/2013] [Indexed: 11/24/2022]
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Deana AM, de Jesus SHC, Sampaio BPA, Oliveira MT, Silva DFT, França CM. Fully automated algorithm for wound surface area assessment. Wound Repair Regen 2013; 21:755-61. [DOI: 10.1111/wrr.12085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Accepted: 06/01/2013] [Indexed: 11/27/2022]
Affiliation(s)
- Alessandro Melo Deana
- Postgraduate Program in Biophotonics Applied to Health Sciences; University Nove de Julho; São Paulo; São Paulo; Brazil
| | | | | | - Marcelo Tavares Oliveira
- Postgraduate Program in Biophotonics Applied to Health Sciences; University Nove de Julho; São Paulo; São Paulo; Brazil
| | - Daniela Fátima Teixeira Silva
- Postgraduate Program in Biophotonics Applied to Health Sciences; University Nove de Julho; São Paulo; São Paulo; Brazil
| | - Cristiane Miranda França
- Postgraduate Program in Biophotonics Applied to Health Sciences; University Nove de Julho; São Paulo; São Paulo; Brazil
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38
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Kuck M, Strese H, Alawi SA, Meinke MC, Fluhr JW, Burbach GJ, Krah M, Sterry W, Lademann J. Evaluation of optical coherence tomography as a non-invasive diagnostic tool in cutaneous wound healing. Skin Res Technol 2013; 20:1-7. [PMID: 23782399 DOI: 10.1111/srt.12077] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND The monitoring of wound-healing processes is indispensable for the therapeutic effectiveness and improved care of chronic wounds. Histological sections provide the best morphological assessment of wound recovery, but cause further tissue destruction and increase the risk of infection. Therefore, it is reasonable to apply a diagnostic tool that allows a non-invasive and reliable observation of morphological changes in wound healing. METHODS Optical coherence tomography (OCT) is an imaging technique for in vivo evaluation of skin diseases with a resolution close to histopathology. The aim of this study was to investigate whether OCT is suited to display the phases of wound healing. For this purpose, six patients with chronic wounds were objectively characterized by OCT during a period of 2 weeks. RESULTS Comparable results between histological findings and OCT were achieved. OCT allowed the detection of partial loss of the epidermis, vasoconstriction, vasodilatation and epithelialization. CONCLUSION Consequently, OCT could be a potential non-invasive diagnostic tool for the characterization and monitoring of cutaneous wound-healing processes over time.
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Affiliation(s)
- Monika Kuck
- Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Berlin, Germany
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Noninvasive characterisation of foot reflexology areas by swept source-optical coherence tomography in patients with low back pain. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:983769. [PMID: 23662156 PMCID: PMC3608122 DOI: 10.1155/2013/983769] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 01/30/2013] [Accepted: 01/31/2013] [Indexed: 12/19/2022]
Abstract
Objective. When exploring the scientific basis of reflexology techniques, elucidation of the surface and subsurface features of reflexology areas (RAs) is crucial. In this study, the subcutaneous features of RAs related to the lumbar vertebrae were evaluated by swept source-optical coherence tomography (SS-OCT) in subjects with and without low back pain (LBP). Methods. Volunteers without LBP (n = 6 (male : female = 1 : 1)) and subjects with LBP (n = 15 (male : female = 2 : 3)) were clinically examined in terms of skin colour (visual perception), localised tenderness (visual analogue scale) and structural as well as optical attributes as per SS-OCT. From each subject, 6 optical tomograms were recorded from equidistant transverse planes along the longitudinal axis of the RAs, and from each tomogram, 25 different spatial locations were considered for recording SS-OCT image attributes. The images were analysed with respect to the optical intensity distributions and thicknesses of different skin layers by using AxioVision Rel. 4.8.2 software. The SS-OCT images could be categorised into 4 pathological grades (i.e., 0, 1, 2, and 3) according to distinctness in the visible skin layers. Results. Three specific grades for abnormalities in SS-OCT images were identified considering gradual loss of distinctness and increase in luminosity of skin layers. Almost 90.05% subjects were of mixed type having predominance in certain grades. Conclusion. The skin SS-OCT system demonstrated a definite association of the surface features of healthy/unhealthy RAs with cutaneous features and the clinical status of the lumbar vertebrae.
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40
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Jung Y, Dziennis S, Zhi Z, Reif R, Zheng Y, Wang RK. Tracking dynamic microvascular changes during healing after complete biopsy punch on the mouse pinna using optical microangiography. PLoS One 2013; 8:e57976. [PMID: 23469122 PMCID: PMC3585416 DOI: 10.1371/journal.pone.0057976] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 01/29/2013] [Indexed: 12/29/2022] Open
Abstract
Optical microangiography (OMAG) and Doppler optical microangiography (DOMAG) are two non-invasive techniques capable of determining the tissue microstructural content, microvasculature angiography, and blood flow velocity and direction. These techniques were used to visualize the acute and chronic microvascular and tissue responses upon an injury in vivo. A tissue wound was induced using a 0.5 mm biopsy punch on a mouse pinna. The changes in the microangiography, blood flow velocity and direction were quantified for the acute (<30 min) wound response and the changes in the tissue structure and microangiography were determined for the chronic wound response (30 min–60 days). The initial wound triggered recruitment of peripheral capillaries, as well as redirection of main arterial and venous blood flow within 3 min. The complex vascular networks and new vessel formation were quantified during the chronic response using fractal dimension. The highest rate of wound closure occurred between days 8 and 22. The vessel tortuosity increased during this time suggesting angiogenesis. Taken together, these data signify that OMAG has the capability to track acute and chronic changes in blood flow, microangiography and structure during wound healing. The use of OMAG has great potential to improve our understanding of vascular and tissue responses to injury in order to develop more effective therapeutics.
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Affiliation(s)
- Yeongri Jung
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Suzan Dziennis
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Zhongwei Zhi
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Roberto Reif
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Ying Zheng
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Ruikang K. Wang
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
- * E-mail:
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Wang CC, Huang CL, Lee SC, Sue YM, Leu FJ. Treatment of cosmetic tattoos with nonablative fractional laser in an animal model: a novel method with histopathologic evidence. Lasers Surg Med 2013; 45:116-22. [PMID: 23401095 DOI: 10.1002/lsm.22086] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2012] [Indexed: 11/08/2022]
Abstract
BACKGROUND AND OBJECTIVE Cosmetic tattoos are difficult to treat using Q-switched lasers. We introduce a novel method for the treatment of cosmetic tattoos using a nonablative fractional laser and investigate the underlying pathophysiological mechanisms in an animal model. STUDY DESIGN/MATERIALS AND METHODS Ten rats were tattooed on their backs with white and flesh-colored pigments. One-half of each tattoo was treated with a 1,550-nm, erbium:glass fractional laser system with energy settings of 17 mJ and 169 MTZ/cm(2) × 2 passes for five sessions at 1-month intervals. The untreated half of each tattoo served as the control. An independent physician reviewed the photographs and scored the clinical response. Serial skin samples were obtained at baseline and at various times after laser treatment. These tissue sections were stained with hematoxylin and eosin, and immunostained for types I, III, and IV collagen; laminin; fibronectin; and α-smooth muscle actin. RESULTS White tattoos showed excellent responses in two rats and good responses in eight rats, whereas flesh-colored tattoos showed excellent responses in four rats and good responses in six rats (P = 0.001 in both cases compared with baseline). Both tattoos exhibited a similar clearance rate (P > 0.05) and histological reactions. Microscopic epidermal necrotic debris (MEND) containing tattoo pigments and collagen fibrils appeared on day 1, increased on day 2, and was exfoliated after 5 days. The dermal-epidermal junction lost integrity 30 minutes after treatment, but recovered completely on day 3. The expression of fibronectin and collagen-III, which play key roles in wound healing, increased around the microscopic treatment zone on days 1-5 and 4-7, respectively. A few myofibroblasts appeared on days 4-7. CONCLUSION Nonablative fractional lasers (NAFLs) successfully remove cosmetic tattoos by transepidermal elimination of tattoo pigments through the disrupted dermal-epidermal junction. This action is facilitated by the wound healing process.
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Affiliation(s)
- Chia-Chen Wang
- Department of Dermatology, Cardinal Tien Hospital, New Taipei City 231, Taiwan
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42
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Yuan Z, Zakhaleva J, Ren H, Liu J, Chen W, Pan Y. Noninvasive and high-resolution optical monitoring of healing of diabetic dermal excisional wounds implanted with biodegradable in situ gelable hydrogels. Tissue Eng Part C Methods 2010; 16:237-47. [PMID: 19496703 DOI: 10.1089/ten.tec.2009.0152] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Closure of diabetic dermal chronic wounds remains a clinical challenge. Implant-assisted healing is emerging as a potential class of therapy for dermal wound closure; this advancement has not been paralleled by the development in complementary diagnostic techniques to objectively monitor the wound-healing process in conjunction with assessing/monitoring of implant efficacy. Biopsies provide the most objective morphological assessments of wound healing; however, they not only perpetuate the wound presence but also increase the risk of infection. A noninvasive and high-resolution imaging technique is highly desirable to provide objective longitudinal diagnosis of implant-assisted wound healing. We investigated the feasibility of deploying optical coherence tomography (OCT) for noninvasive monitoring of the healing of full-thickness excisional dermal wounds implanted with a novel in situ gelable hydrogel composed of N-carboxyethyl chitosan, oxidized dextran, and hyaluronan, in both normal and db/db mice. The results showed that OCT was able to differentiate the morphological differences (e.g., thickness of dermis) between normal and diabetic mice as validated by their corresponding histological evaluations (p < 0.05). OCT could detect essential morphological changes during wound healing, including re-epithelization, inflammatory response, and granulation tissue formation as well as impaired wound repair in diabetic mice. Importantly, by tracking specific morphological changes in hydrogel-assisted wound healing (e.g., implants' degradation and resorption, cell-mediated hydrogel degradation, and accelerated re-epithelization), OCT could also be deployed to monitor and evaluate the transformation of implanted biomaterials, thus holding the promise for noninvasive and objective monitoring of wound healing longitudinally and for objective efficacy assessment of implantable therapeutics in tissue engineering.
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Affiliation(s)
- Zhijia Yuan
- Department of Biomedical Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-8181, USA
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Pan CP, Shi Y, Amin K, Greenberg CS, Haroon Z, Faris GW. Wound healing monitoring using near infrared fluorescent fibrinogen. BIOMEDICAL OPTICS EXPRESS 2010; 1:285-294. [PMID: 21258466 PMCID: PMC3005166 DOI: 10.1364/boe.1.000285] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Revised: 07/19/2010] [Accepted: 07/19/2010] [Indexed: 05/30/2023]
Abstract
We demonstrate a method for imaging the wound healing process with near infrared fluorescent fibrinogen. Wound healing studies were performed on a rat punch biopsy model. Fibrinogen was conjugated with a near infrared fluorescent dye and injected into the tail vein. Fibrinogen is a useful protein for tracking wound healing because it is involved in fibrin clot formation and formation of new provisional matrix through transglutaminase's crosslinking activity. Strong fluorescence specific to the wound was observed and persisted for several days, indicating that the fibrinogen is converted to crosslinked fibrin. Administration of contrast agent simultaneously with wound creation led to primary labeling of the fibrin clot, indicating that the wound was in its early phase of healing. Administration on the following day showed labeling on the wound periphery, indicating location of formation of a new provisional matrix. This method may prove to be useful as a diagnostic for basic studies of the wound healing process, in drug development, or in clinical assessment of chronic wounds.
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Affiliation(s)
- Chia-Pin Pan
- Physical Sciences Division, SRI International, 333 Ravenswood Avenue,
Menlo Park, CA. 94025, USA
| | - Yihui Shi
- Biosciences Division, SRI International, 333 Ravenswood Avenue,
Menlo Park, CA. 94025, USA
| | - Khalid Amin
- Dept of Pathology and Laboratory Medicine, University of Kansas, 3901 Rainbow Blvd,
Kansas City, KS 66160, USA
| | - Charles S. Greenberg
- Medical University of South Carolina, 96 Jonathan Lucas Street,
Charleston, SC 29424, USA
| | - Zishan Haroon
- Carolina Institute for Nanomedicine, University of North Carolina,
1079 GMB, CB#7295, Chapel Hill, NC 27599, USA
| | - Gregory W. Faris
- Physical Sciences Division, SRI International, 333 Ravenswood Avenue,
Menlo Park, CA. 94025, USA
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Sahu K, Verma Y, Sharma M, Rao KD, Gupta PK. Non-invasive assessment of healing of bacteria infected and uninfected wounds using optical coherence tomography. Skin Res Technol 2010; 16:428-37. [DOI: 10.1111/j.1600-0846.2010.00451.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Han JH, Kang JU, Song CG. Polarization sensitive subcutaneous and muscular imaging based on common path optical coherence tomography using near infrared source. J Med Syst 2009; 35:521-6. [PMID: 20703538 DOI: 10.1007/s10916-009-9388-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Accepted: 10/05/2009] [Indexed: 11/26/2022]
Abstract
In this paper, we describe a polarization sensitive (PS) subcutaneous and muscular imaging system based on common path optical coherence tomography (CP-OCT) using a near infrared source. The axial and lateral resolutions of the PS-OCT system are 9 and 6 μm, respectively. The main goal of this work is to build a high-resolution and minimally invasive optical imager for examining various kinds of cutaneous substructures with intrinsic or form birefringence. The internal structural information is extracted by the real-time signal analysis (Fourier Transform) of the modulated spectral intensity depending on the beam and tissue birefringence. The preliminary results using fresh beef longissimus muscle and in vivo Rattus norvegicus (rat) show that it is possible to visualize the birefringence effect of the tissue collagen fibers in the samples in order to achieve superior image contrast and sensitivity for the detection of hidden dermal structures. Compared to conventional CP-OCT, the proposed PS-OCT system provides depth-resolved images, which reflect the tissue birefringence.
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Affiliation(s)
- Jae-Ho Han
- Department of Electrical and Computer Engineering, John Hopkins University, Baltimore, MD 21218, USA
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Papazoglou ES, Neidrauer M, Zubkov L, Weingarten MS, Pourrezaei K. Noninvasive assessment of diabetic foot ulcers with diffuse photon density wave methodology: pilot human study. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:064032. [PMID: 20059270 DOI: 10.1117/1.3275467] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A pilot human study is conducted to evaluate the potential of using diffuse photon density wave (DPDW) methodology at near-infrared (NIR) wavelengths (685 to 830 nm) to monitor changes in tissue hemoglobin concentration in diabetic foot ulcers. Hemoglobin concentration is measured by DPDW in 12 human wounds for a period ranging from 10 to 61 weeks. In all wounds that healed completely, gradual decreases in optical absorption coefficient, oxygenated hemoglobin concentration, and total hemoglobin concentration are observed between the first and last measurements. In nonhealing wounds, the rates of change of these properties are nearly zero or slightly positive, and a statistically significant difference (p<0.05) is observed in the rates of change between healing and nonhealing wounds. Differences in the variability of DPDW measurements over time are observed between healing and nonhealing wounds, and this variance may also be a useful indicator of nonhealing wounds. Our results demonstrate that DPDW methodology with a frequency domain NIR device can differentiate healing from nonhealing diabetic foot ulcers, and indicate that it may have clinical utility in the evaluation of wound healing potential.
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Affiliation(s)
- Elisabeth S Papazoglou
- Drexel University, School of Biomedical Engineering, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, USA.
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Neidrauer M, Papazoglou ES. Optical Non-invasive Characterization of Chronic Wounds. BIOENGINEERING RESEARCH OF CHRONIC WOUNDS 2009. [DOI: 10.1007/978-3-642-00534-3_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Aizawa K, Sato S, Saitoh D, Ashida H, Obara M. Photoacoustic monitoring of burn healing process in rats. JOURNAL OF BIOMEDICAL OPTICS 2008; 13:064020. [PMID: 19123666 DOI: 10.1117/1.3028005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We performed multiwavelength photoacoustic (PA) measurement for extensive deep dermal burns in rats to monitor the healing process of the wounds. The PA signal peak at 532 nm, an isosbestic point for oxyhemoglobin (HbO(2)) and deoxyhemoglobin (HHb), was found to shift to a shallower region of the injured skin tissue with the elapse of time. The results of histological analysis showed that the shift of the PA signal reflected angiogenesis in the wounds. Until 24 h postburn, PA signal amplitude generally increased at all wavelengths. We speculate that this increase in amplitude is associated with dilation of blood vessels within healthy tissue under the injured tissue layer and increased hematocrit value due to development of edema. From 24 to 48 h postburn, the PA signal showed wavelength-dependent behaviors; signal amplitudes at 532, 556, and 576 nm continued to increase, while amplitude at 600 nm, an HHb absorption-dominant wavelength, decreased. This seems to reflect change from shock phase to hyperdynamic state in the rat; in the hyperdynamic state, cardiac output and oxygen consumption increased considerably. These findings show that multiwavelength PA measurement would be useful for monitoring recovery of perfusion and change in local hemodynamics in the healing process of burns.
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Affiliation(s)
- Kazuya Aizawa
- Keio University, Department of Electronics and Electrical Engineering, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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Klyen BR, Armstrong JJ, Adie SG, Radley HG, Grounds MD, Sampson DD. Three-dimensional optical coherence tomography of whole-muscle autografts as a precursor to morphological assessment of muscular dystrophy in mice. JOURNAL OF BIOMEDICAL OPTICS 2008; 13:011003. [PMID: 18315352 DOI: 10.1117/1.2870170] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Three-dimensional optical coherence tomography (3D-OCT) is used to evaluate the structure and pathology of regenerating mouse skeletal muscle autografts for the first time. The death of myofibers with associated inflammation and subsequent new muscle formation in this graft model represents key features of necrosis and inflammation in the human disease Duchenne muscular dystrophy. We perform 3D-OCT imaging of excised autografts and compare OCT images with coregistered histology. The OCT images readily distinguish the necrotic and inflammatory tissue of the graft from the intact healthy muscle fibers in the underlying host tissue. These preliminary findings suggest that, with further development, 3D-OCT could be used as a tool for the evaluation of small-animal muscle morphology and pathology, in particular, for analysis of mouse models of muscular dystrophy.
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Affiliation(s)
- Blake R Klyen
- The University of Western Australia, School of Electrical, Electronic and Computer Engineering, Optical+Biomedical Engineering Laboratory, 35 Stirling Highway, Crawley, Western Australia 6009, Australia.
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