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Petrescu SMS, Țuculină MJ, Osiac E, Camen A, Sălan AI, Mărășescu FI, Nicola AG, Bechir ES, Dascălu IT. Use of optical coherence tomography in orthodontics. Exp Ther Med 2021; 22:1424. [PMID: 34707705 PMCID: PMC8543239 DOI: 10.3892/etm.2021.10859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/07/2021] [Indexed: 11/24/2022] Open
Abstract
Optical coherence tomography (OCT) is a modern imaging method with applicability in orthodontics. In recent years, there has been an increasing trend in the use of ceramic brackets. The aim of the present study was to investigate the effects of bonding metallic and ceramic brackets on tooth enamel, using optical coherence tomography. For this purpose, 20 permanent teeth we bonded and were subsequently debonded using a side cutter or anterior bracket removal pliers. Using the OCT technique, the enamel, the amount of adhesive remaining and the bracket fragments remaining on the tooth surface were analyzed following the debonding procedure. It was demonstrated that enamel cracks were present only in the samples bonded with ceramic brackets. At the same time, it was noted that the type of pliers did not affect the incidence and extent of damage to the enamel. The type of debonding technique (using the side cutter or the anterior removal pliers) used did not markedly affect the amount of adhesive remaining on the teeth. Thus, as demonstrated herein, by analyzing the enamel structure through the use of OCT, the quality of the processes and the materials used for manufacturing brackets can be increased.
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Affiliation(s)
| | - Mihaela Jana Țuculină
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Eugen Osiac
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Adrian Camen
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Alex Ioan Sălan
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | | | - Andreea Gabriela Nicola
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Edwin Sever Bechir
- Faculty of Dentistry, University of Medicine and Pharmacy of Târgu Mureș, 540142 Târgu Mureș, Romania
| | - Ionela Teodora Dascălu
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
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Gora MJ, Suter MJ, Tearney GJ, Li X. Endoscopic optical coherence tomography: technologies and clinical applications [Invited]. BIOMEDICAL OPTICS EXPRESS 2017; 8:2405-2444. [PMID: 28663882 PMCID: PMC5480489 DOI: 10.1364/boe.8.002405] [Citation(s) in RCA: 142] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 03/20/2017] [Accepted: 03/27/2017] [Indexed: 05/07/2023]
Abstract
In this paper, we review the current state of technology development and clinical applications of endoscopic optical coherence tomography (OCT). Key design and engineering considerations are discussed for most OCT endoscopes, including side-viewing and forward-viewing probes, along with different scanning mechanisms (proximal-scanning versus distal-scanning). Multi-modal endoscopes that integrate OCT with other imaging modalities are also discussed. The review of clinical applications of endoscopic OCT focuses heavily on diagnosis of diseases and guidance of interventions. Representative applications in several organ systems are presented, such as in the cardiovascular, digestive, respiratory, and reproductive systems. A brief outlook of the field of endoscopic OCT is also discussed.
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Affiliation(s)
- Michalina J Gora
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA
- ICube Laboratory, CNRS, Strasbourg University, 1 Place de l'Hopital, Strasbourg 67091, France
| | - Melissa J Suter
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA
- Department of Medicine, Division of Pulmonary and Critical Care, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA
- Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA
| | - Guillermo J Tearney
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA
- Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA
- Department of Pathology, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA
| | - Xingde Li
- Department of Biomedical Engineering, Department of Electrical and Computer Engineering, and Department of Oncology, Johns Hopkins University, 720 Rutland Avenue, Traylor 710, Baltimore, MD 21205, USA
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Kawagoe H, Ishida S, Aramaki M, Sakakibara Y, Omoda E, Kataura H, Nishizawa N. Development of a high power supercontinuum source in the 1.7 μm wavelength region for highly penetrative ultrahigh-resolution optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2014; 5:932-43. [PMID: 24688825 PMCID: PMC3959847 DOI: 10.1364/boe.5.000932] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 02/15/2014] [Accepted: 02/18/2014] [Indexed: 05/19/2023]
Abstract
We developed a high power supercontinuum source at a center wavelength of 1.7 μm to demonstrate highly penetrative ultrahigh-resolution optical coherence tomography (UHR-OCT). A single-wall carbon nanotube dispersed in polyimide film was used as a transparent saturable absorber in the cavity configuration and a high-repetition-rate ultrashort-pulse fiber laser was realized. The developed SC source had an output power of 60 mW, a bandwidth of 242 nm full-width at half maximum, and a repetition rate of 110 MHz. The average power and repetition rate were approximately twice as large as those of our previous SC source [20]. Using the developed SC source, UHR-OCT imaging was demonstrated. A sensitivity of 105 dB and an axial resolution of 3.2 μm in biological tissue were achieved. We compared the UHR-OCT images of some biological tissue samples measured with the developed SC source, the previous one, and one operating in the 1.3 μm wavelength region. We confirmed that the developed SC source had improved sensitivity and penetration depth for low-water-absorption samples.
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Affiliation(s)
- H. Kawagoe
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - S. Ishida
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - M. Aramaki
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Y. Sakakibara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- JST, CREST, Kawaguchi, Saitama 330-0012, Japan
| | - E. Omoda
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - H. Kataura
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- JST, CREST, Kawaguchi, Saitama 330-0012, Japan
| | - N. Nishizawa
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Qi X, Pan Y, Sivak MV, Willis JE, Isenberg G, Rollins AM. Image analysis for classification of dysplasia in Barrett's esophagus using endoscopic optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2010; 1:825-847. [PMID: 21258512 PMCID: PMC3018066 DOI: 10.1364/boe.1.000825] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 09/07/2010] [Accepted: 09/07/2010] [Indexed: 05/02/2023]
Abstract
Barrett's esophagus (BE) and associated adenocarcinoma have emerged as a major health care problem. Endoscopic optical coherence tomography is a microscopic sub-surface imaging technology that has been shown to differentiate tissue layers of the gastrointestinal wall and identify dysplasia in the mucosa, and is proposed as a surveillance tool to aid in management of BE. In this work a computer-aided diagnosis (CAD) system has been demonstrated for classification of dysplasia in Barrett's esophagus using EOCT. The system is composed of four modules: region of interest segmentation, dysplasia-related image feature extraction, feature selection, and site classification and validation. Multiple feature extraction and classification methods were evaluated and the process of developing the CAD system is described in detail. Use of multiple EOCT images to classify a single site was also investigated. A total of 96 EOCT image-biopsy pairs (63 non-dysplastic, 26 low-grade and 7 high-grade dysplastic biopsy sites) from a previously described clinical study were analyzed using the CAD system, yielding an accuracy of 84% for classification of non-dysplastic vs. dysplastic BE tissue. The results motivate continued development of CAD to potentially enable EOCT surveillance of large surface areas of Barrett's mucosa to identify dysplasia.
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Affiliation(s)
- Xin Qi
- Departments of Biomedical Engineering, Case Western Reserve University,
Cleveland, OH 44106, USA
| | - Yinsheng Pan
- Departments of Biomedical Engineering, Case Western Reserve University,
Cleveland, OH 44106, USA
| | - Michael V. Sivak
- Departments of Medicine, Case Western Reserve University,
Cleveland, OH 44106, USA
| | - Joseph E. Willis
- Departments of Pathology, Case Western Reserve University,
Cleveland, OH 44106, USA
| | - Gerard Isenberg
- Departments of Medicine, Case Western Reserve University,
Cleveland, OH 44106, USA
| | - Andrew M. Rollins
- Departments of Biomedical Engineering, Case Western Reserve University,
Cleveland, OH 44106, USA
- Departments of Medicine, Case Western Reserve University,
Cleveland, OH 44106, USA
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Gastrointestinal optical coherence tomography: clinical applications, limitations, and research priorities. Gastrointest Endosc Clin N Am 2009; 19:243-59. [PMID: 19423022 DOI: 10.1016/j.giec.2009.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Optical coherence tomography provides the highest resolution available of any of the technologies currently used in endoscopic imaging. There are several potential clinical applications for optical coherence tomography, particularly with precancerous conditions of the gastrointestinal tract. The future of optical coherence tomography is discussed.
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Isenberg G, Chak A. Should there be light in the esophageal tunnel? An appraisal of optical coherence tomography in Barrett's esophagus. Gastrointest Endosc 2007; 65:57-9. [PMID: 17137853 DOI: 10.1016/j.gie.2006.06.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Accepted: 06/07/2006] [Indexed: 12/20/2022]
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Qi X, Sivak MV, Isenberg G, Willis JE, Rollins AM. Computer-aided diagnosis of dysplasia in Barrett's esophagus using endoscopic optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2006; 11:044010. [PMID: 16965167 DOI: 10.1117/1.2337314] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Barrett's esophagus (BE) and associated adenocarcinoma have emerged as a major health care problem over the last two decades. Because of the widespread use of endoscopy, BE is being recognized increasingly in all Western countries. In clinical trials of endoscopic optical coherence tomography (EOCT), we defined certain image features that appear to be characteristic of precancerous (dysplastic) mucosa: decreased scattering and disorganization in the microscopic morphology. The objective of the present work is to develop computer-aided diagnosis (CAD) algorithms that aid the detection of dysplasia in BE. The image dataset used in the present study was derived from a total of 405 EOCT images (13 patients) that were paired with highly correlated histologic sections of corresponding biopsies. Of these, 106 images were included in the study. The CAD algorithm used was based on a standard texture analysis method (center-symmetric auto-correlation). Using histology as the reference standard, this CAD algorithm had a sensitivity of 82%, specificity of 74%, and accuracy of 83%. CAD has the potential to quantify and standardize the diagnosis of dysplasia and allows high throughput image evaluation for EOCT screening applications. With further refinements, CAD could also improve the accuracy of EOCT identification of dysplasia in BE.
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Affiliation(s)
- Xin Qi
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, Ohio 44106, USA
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Isenberg G, Sivak MV, Chak A, Wong RCK, Willis JE, Wolf B, Rowland DY, Das A, Rollins A. Accuracy of endoscopic optical coherence tomography in the detection of dysplasia in Barrett's esophagus: a prospective, double-blinded study. Gastrointest Endosc 2005; 62:825-31. [PMID: 16301020 DOI: 10.1016/j.gie.2005.07.048] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Accepted: 07/01/2005] [Indexed: 12/12/2022]
Abstract
BACKGROUND Endoscopic optical coherence tomography (EOCT) is a high-resolution, cross-sectional tissue-imaging technique that provides microscopic morphologic information. EOCT should detect dysplasia in Barrett's epithelium, but this has not been established in a prospective blinded study. This study evaluated the accuracy of EOCT for the diagnosis and the exclusion of dysplasia in patients with Barrett's esophagus. METHODS A 2.4-mm diameter EOCT probe was modified for use with a cap-fitted, two-channel endoscope. Pairs of EOCT image streams and jumbo biopsy specimens were obtained. Endoscopy/EOCT procedures were performed by 4 endoscopists who separately reviewed the EOCT digital images for the absence or the presence of dysplasia (low grade, high grade, or cancer) for each biopsy specimen obtained. The endoscopists were blinded to the interpretation of the pathology. An experienced pathologist blinded to the endoscopic/EOCT findings evaluated each biopsy for the absence or the presence of dysplasia. The setting of the study was a major academic medical center. Adult patients with documented Barrett's esophagus greater than 2 cm were included in the study. The main outcome measurement was the accuracy of EOCT in the detection of dysplasia in patients with Barrett's esophagus. RESULTS A total of 314 usable EOCT image stream/biopsy pairs were obtained in 33 patients. By using histology as the standard, the performance of EOCT was sensitivity, 68%; specificity, 82%; positive predictive value, 53%; negative predictive value, 89%; and diagnostic accuracy, 78%. Diagnostic accuracy for the 4 endoscopists ranged from 56% to 98%. Limitations of the study were the variability in endoscopists' accuracy rates, difficulty in real-time interpretation, and the need for refined criteria of dysplasia by EOCT imaging. CONCLUSIONS The current EOCT system has an accuracy of 78% for the detection of dysplasia in patients with Barrett's esophagus. EOCT could be used to target biopsies to areas of Barrett's epithelium with a higher probability for the presence of dysplasia. However, further modifications, including increased resolution and identification of further potential OCT characteristics of dysplasia, are needed before EOCT can be used clinically.
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Affiliation(s)
- Gerard Isenberg
- Department of Medicine, Division of Gastroenterology, University Hospitals of Cleveland, Case Western Reserve University, Cleveland, OH 44106-5066, USA
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Pellisé M, Llach J, Bordas JM. Técnicas endoscópicas emergentes. La llegada de la histología virtual. GASTROENTEROLOGIA Y HEPATOLOGIA 2005; 28:641-8. [PMID: 16373017 DOI: 10.1016/s0210-5705(05)71531-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Endoscopic technology has evolved in such a way that gastroenterologists can now visualize and store high-resolution images of the gastrointestinal tract. This has improved the approach to precancerous and cancerous lesions of the gastrointestinal tract and biliary tree. However, certain difficulties remain, especially in relation to diagnosis. In the last few years, multiple techniques have been developed that, using the properties of light, enable an instantaneous histologic diagnosis to be made while endoscopy is being performed. What has been called the "optical biopsy" allows highly exact information to be obtained, both from the morphological and functional point of view. Some of these techniques, such as chromoendoscopy and magnification, are already being performed in clinical practice while others are still under investigation. The aim of the present article is to review the underlying principles and applications of these emerging techniques.
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Affiliation(s)
- M Pellisé
- Servicio de Gastroenterología, Institut de Malalties Digestives i Metabòliques, Hospital Clínic, Barcelona, Spain.
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