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Parmar A, Singh K. Motion-artifact-free single shot two-beam optical coherence elastography system. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:025003. [PMID: 38390309 PMCID: PMC10883076 DOI: 10.1117/1.jbo.29.2.025003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 02/24/2024]
Abstract
Significance The assessment of the biomechanical properties of the skin using various imaging techniques has been used as a diagnostic tool in dermatology. Optical coherence elastography (OCE) is one of the techniques that allows for the measurement of elastic properties. OCE relies on measuring tissue displacements induced by external sources. Measuring the tissue's mechanical properties in vivo using OCE is often challenging due to bulk tissue movement. Aim This study aimed to develop an OCE system that allows for minimizing the effects of bulk tissue movements. To achieve this, we designed a two-beam OCE system that simultaneously measures the tissue displacement at two locations on the sample. This allows for cancelling the effect of the tissue bulk movement, which is common to both measurement points. Approach We used a piezoelectric transducer to generate surface acoustic waves (SAW) in the sample. The velocity of the excited waves, which is proportional to the rigidity of the sample, was measured by calculating the phase delay of the SAW at two locations on the sample. Simultaneous measurement at two locations was achieved by dividing a single light beam into two by focusing on the sample at two different locations. The two beams travel different optical path lengths, and the reflected signals were depth encoded in a single optical coherence tomography scan using a single reference beam. Results The system was characterized using different tissue-mimicking phantoms and the skin of healthy volunteers at the wrist and the palm. We achieved an approximately 50-fold increase in phase sensitivity measurement. Conclusions We designed a simple two-beam OCE system that effectively minimizes the effect of tissue movement. We believe that the presented system will find immediate applications in the clinic to monitor the progression of systemic sclerosis disease.
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Affiliation(s)
- Asha Parmar
- Max-Planck-Institute for the Science of Light, Erlangen, Germany
- Max-Planck-Zentrum für Physik und Medizin, Erlangen, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Experimental Physics, Erlangen, Germany
| | - Kanwarpal Singh
- Max-Planck-Institute for the Science of Light, Erlangen, Germany
- Max-Planck-Zentrum für Physik und Medizin, Erlangen, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Experimental Physics, Erlangen, Germany
- McMaster University, Department of Electrical and Computer Engineering, Hamilton, Ontario, Canada
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Overview of Optical Biosensors for Early Cancer Detection: Fundamentals, Applications and Future Perspectives. BIOLOGY 2023; 12:biology12020232. [PMID: 36829508 PMCID: PMC9953566 DOI: 10.3390/biology12020232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/09/2022] [Accepted: 11/11/2022] [Indexed: 02/05/2023]
Abstract
Conventional cancer detection and treatment methodologies are based on surgical, chemical and radiational processes, which are expensive, time consuming and painful. Therefore, great interest has been directed toward developing sensitive, inexpensive and rapid techniques for early cancer detection. Optical biosensors have advantages in terms of high sensitivity and being label free with a compact size. In this review paper, the state of the art of optical biosensors for early cancer detection is presented in detail. The basic idea, sensitivity analysis, advantages and limitations of the optical biosensors are discussed. This includes optical biosensors based on plasmonic waveguides, photonic crystal fibers, slot waveguides and metamaterials. Further, the traditional optical methods, such as the colorimetric technique, optical coherence tomography, surface-enhanced Raman spectroscopy and reflectometric interference spectroscopy, are addressed.
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Alexopoulos P, Madu C, Wollstein G, Schuman JS. The Development and Clinical Application of Innovative Optical Ophthalmic Imaging Techniques. Front Med (Lausanne) 2022; 9:891369. [PMID: 35847772 PMCID: PMC9279625 DOI: 10.3389/fmed.2022.891369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 05/23/2022] [Indexed: 11/22/2022] Open
Abstract
The field of ophthalmic imaging has grown substantially over the last years. Massive improvements in image processing and computer hardware have allowed the emergence of multiple imaging techniques of the eye that can transform patient care. The purpose of this review is to describe the most recent advances in eye imaging and explain how new technologies and imaging methods can be utilized in a clinical setting. The introduction of optical coherence tomography (OCT) was a revolution in eye imaging and has since become the standard of care for a plethora of conditions. Its most recent iterations, OCT angiography, and visible light OCT, as well as imaging modalities, such as fluorescent lifetime imaging ophthalmoscopy, would allow a more thorough evaluation of patients and provide additional information on disease processes. Toward that goal, the application of adaptive optics (AO) and full-field scanning to a variety of eye imaging techniques has further allowed the histologic study of single cells in the retina and anterior segment. Toward the goal of remote eye care and more accessible eye imaging, methods such as handheld OCT devices and imaging through smartphones, have emerged. Finally, incorporating artificial intelligence (AI) in eye images has the potential to become a new milestone for eye imaging while also contributing in social aspects of eye care.
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Affiliation(s)
- Palaiologos Alexopoulos
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, United States
| | - Chisom Madu
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, United States
| | - Gadi Wollstein
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, United States
- Department of Biomedical Engineering, NYU Tandon School of Engineering, Brooklyn, NY, United States
- Center for Neural Science, College of Arts & Science, New York University, New York, NY, United States
| | - Joel S. Schuman
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, United States
- Department of Biomedical Engineering, NYU Tandon School of Engineering, Brooklyn, NY, United States
- Center for Neural Science, College of Arts & Science, New York University, New York, NY, United States
- Department of Electrical and Computer Engineering, NYU Tandon School of Engineering, Brooklyn, NY, United States
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Wang C, Xing S, Xu M, Shi H, Wu X, Fu Q, Jiang H. The Influence of Optical Alignment Error on Compression Coding Superresolution Imaging. SENSORS 2022; 22:s22072717. [PMID: 35408330 PMCID: PMC9003395 DOI: 10.3390/s22072717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/05/2022] [Accepted: 03/10/2022] [Indexed: 11/16/2022]
Abstract
Superresolution (SR) imaging technology based on compression coding has always been considered as the key to break through the geometric resolution of the detector. In addition to factors such as the reconstruction algorithm and mounting platform vibrations, the impact of inherent errors in the optical system itself on the reconstruction results of SR imaging is also obvious. To address this issue, a study on the design of the SR optical system and the influence of optical alignment errors on SR imaging was conducted. The design of the SR optical system based on digital micro-mirror device (DMD) for long-wave infrared wavelength was completed, and an athermal analysis of the system was carried out. The design results showed that the SR optical system has good imaging quality in the operating temperature range. The imaging model of the DMD SR imaging optical system is established according to the designed SR optical system. We investigated the influence of various alignment errors, including decenter, tilt, lens interval error and defocus, on the imaging properties of the SR optical system. Various random combinations of alignment errors were introduced into the optical system, respectively, and the SR reconstructed image quality of the imaging system was analyzed using the inverse sensitivity method to obtain the tolerance limits when the system was assembled. Finally, the effectiveness of the method to obtain the alignment tolerance limit of the compression coding SR imaging optical system was verified through a desktop demonstration experiment.
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Affiliation(s)
- Chao Wang
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
- Correspondence:
| | - Siyuan Xing
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Miao Xu
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Haodong Shi
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Xingkai Wu
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Qiang Fu
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Huilin Jiang
- Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China; (S.X.); (M.X.); (H.S.); (X.W.); (Q.F.); (H.J.)
- College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
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Comparison of Pulse Wave Signal Monitoring Techniques with Different Fiber-Optic Interferometric Sensing Elements. PHOTONICS 2021. [DOI: 10.3390/photonics8050142] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Pulse wave (PW) measurement is a highly prominent technique, used in biomedical diagnostics. Development of novel PW sensors with increased accuracy and reduced susceptibility to motion artifacts will pave the way to more advanced healthcare technologies. This paper reports on a comparison of performance of fiber optic pulse wave sensors, based on Fabry–Perot interferometer, fiber Bragg grating, optical coherence tomography (OCT) and singlemode-multimode-singlemode intermodal interferometer. Their performance was tested in terms of signal to noise ratio, repeatability of demodulated signals and suitability of demodulated signals for extraction of information about direct and reflected waves. It was revealed that the OCT approach of PW monitoring provided the best demodulated signal quality and was most robust against motion artifacts. Advantages and drawbacks of all compared PW measurement approaches in terms of practical questions, such as multiplexing capabilities and abilities to be interrogated by portable hardware are discussed.
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A Method for the Assessment of Textile Pilling Tendency Using Optical Coherence Tomography. SENSORS 2020; 20:s20133687. [PMID: 32630189 PMCID: PMC7374317 DOI: 10.3390/s20133687] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 06/24/2020] [Accepted: 06/29/2020] [Indexed: 11/27/2022]
Abstract
Pilling is caused by friction pulling and fuzzing the fibers of a material. Pilling is normally evaluated by visually counting the pills on a flat fabric surface. Here, we propose an objective method of pilling assessment, based on the textural characteristics of the fabric shown in optical coherence tomography (OCT) images. The pilling layer is first identified above the fabric surface. The percentage of protruding fiber pixels and Haralick’s textural features are then used as pilling descriptors. Principal component analysis (PCA) is employed to select strongly correlated features and then reduce the feature space dimensionality. The first principal component is used to quantify the intensity of fabric pilling. The results of experimental studies confirm that this method can determine the intensity of pilling. Unlike traditional methods of pilling assessment, it can also detect pilling in its early stages. The approach could help to prevent overestimation of the degree of pilling, thereby avoiding unnecessary procedures, such as mechanical removal of entangled fibers. However, the research covered a narrow group of fabrics and wider conclusions about the usefulness and limitations of this method can be drawn after examining fabrics of different thickness and chemical composition of fibers.
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