Massachusetts General Hospital

Automatic intraluminal scanning with a steerable endoscopic optical coherence tomography catheter for gastroenterology applications

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Significance Endoscopic optical coherence tomography (OCT) enables real-time optical biopsy of human organs. Endoscopic probes require miniaturization of optics, which in turn limits field of view. When larger imaging areas are needed such as in the gastrointestinal tract, the operator must manually scan the probe over the tissue to extend the field of view, often resulting in an imperfect scanning pattern and increased risk of missing lesions. Automatic scanning has the potential to extend the field of view of OCT, allowing the user to focus on image interpretation during real-time observations. Aim This work proposes an automatic scanning using a steerable OCT catheter integrated with a robotized interventional flexible endoscope. The aim is to extend the field of view of a low-profile OCT probe while improving scanning accuracy and maintaining a stable endoscope’s position during minimally invasive treatment of colorectal lesions. Approach A geometrical model of the steerabl...

Facilitating glaucoma diagnosis with inter-eye neuroretinal rim asymmetry analysis using spectral domain optical coherence tomography

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Purpose: To determine if inter-eye asymmetry of a three-dimensional neuroretinal rim parameter, the minimum distance band, is useful in differentiating normal from open-angle glaucoma eyes. Materials and Methods: This is a cross-sectional study. Both eyes of 28 normal subjects 33 glaucoma subjects were analyzed. Subjects underwent spectral domain optical coherence tomography imaging of both eyes. A custom-designed segmentation algorithm calculated mean minimum distance band neuroretinal rim thickness globally, for four quadrants and for four sectors. Inter-eye minimum distance band thickness asymmetry was calculated as the absolute difference in minimum distance band thickness values between the right and left eyes. Results:  Increasing minimum distance band thickness asymmetry was not associated with increasing age or increasing refractive error asymmetry. Glaucoma patients had thinner mean neuroretinal rim thickness values compared to normal patients (209.0 μm versus 306.0 μ...

Post-Doctoral Fellow (Translational Biomedical Optics) at Massachusetts General Hospital / Harvard Medical School

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Division of Pulmonary and Critical Care Medicine / Department of Pathology Employer: Massachusetts General Hospital / Harvard Medical School The Hariri Optical Imaging Laboratory is a multidisciplinary research group at Massachusetts General Hospital and Harvard Medical School. The focus of the laboratory is on the design, development and clinical translation of endoscopic optical coherence tomography (OCT)-based imaging devices for microscopic detection, diagnosis and monitoring of pulmonary diseases, including lung fibrosis, smoking and vaping-related lung diseases, post-COVID lung disease and interstitial lung abnormalities. A highly motivated, independent, innovative, and organized individual with an interest in translational optical/diagnostic imaging and biomedicine is sought for a Post-Doctoral Research Fellow position. The appropriate candidate will work in a highly collaborative multidisciplinary research environment consisting of engineers, physicians and technici...

Wide-Field Three-Dimensional Depth-Invariant Cellular-Resolution Imaging of the Human Retina

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Three-dimensional (3D) cellular-resolution imaging of the living human retina over a large field of view will bring a great impact in clinical ophthalmology, potentially finding new biomarkers for early diagnosis and improving the pathophysiological understanding of ocular diseases. While hardware-based and computational adaptive optics (AO) optical coherence tomography (OCT) have been developed to achieve cellular-resolution retinal imaging, these approaches support limited 3D imaging fields, and their high cost and intrinsic hardware complexity limit their practical utility. Here, this work demonstrates 3D depth-invariant cellular-resolution imaging of the living human retina over a 3 × 3 mm field of view using the first intrinsically phase-stable multi-MHz retinal swept-source OCT and novel computational defocus and aberration correction methods. Single-acquisition imaging of photoreceptor cells, retinal nerve fiber layer, and retinal capillaries is presented across unprecedented...

Postdoctoral Research Fellowships (In Vivo Microscopy) at Massachusetts General Hospital

Employer Description Guillermo (Gary) J. Tearney, M.D., Ph.D. Tearney Lab – Wellman Center for Photomedicine Massachusetts General Hospital The Tearney Lab is an 80+ person multidisciplinary lab led by Guillermo (Gary) Tearney, MD, PhD. The goal of the Tearney Lab is to see every cell in the human body so that disease can be detected at its earliest stages when it can be cured.  To this end, the lab has pioneered multiple optical coherence tomography (OCT) devices that enable 3D imaging at the microscopic scale in living human patients. These technologies include multimodality OCT where OCT is combined with spectroscopy, fluorescence, and other optical techniques, ultrahigh-resolution OCT (µOCT) where the resolution is sufficiently detailed to visualize individual cells, and functional OCT that measures the function and metabolism of cells in living systems. These technologies are implemented in a variety of devices (endoscopes, catheters, capsules, implan...

Postdoctoral Research Fellowships (OCT Image Processing and Machine Learning) at Massachusetts General Hospital

Employer Description Guillermo (Gary) J. Tearney, M.D., Ph.D. Tearney Lab – Wellman Center for Photomedicine Massachusetts General Hospital  The Tearney Lab is an 80+ person multidisciplinary lab led by Guillermo (Gary) Tearney, MD, PhD. The goal of the Tearney Lab is to see every cell in the human body so that disease can be detected at its earliest stages when it can be cured.  To this end, the lab has pioneered multiple optical coherence tomography (OCT) devices that enable 3D imaging at the microscopic scale in living human patients. These technologies include multimodality OCT where OCT is combined with spectroscopy, fluorescence, and other optical techniques, ultrahigh-resolution OCT (µOCT) where the resolution is sufficiently detailed to visualize individual cells, and functional OCT that measures the function and metabolism of cells in living systems. These technologies are implemented in a variety of devices (endoscopes, catheters, capsules, ...

Postdoctoral Research Fellowships (Optical Coherence Tomography) at Massachusetts General Hospital

Employer Description Guillermo (Gary) J. Tearney, M.D., Ph.D. Tearney Lab – Wellman Center for Photomedicine Massachusetts General Hospital  The Tearney Lab is an 80+ person multidisciplinary lab led by Guillermo (Gary) Tearney, MD, PhD. The goal of the Tearney Lab is to see every cell in the human body so that disease can be detected at its earliest stages when it can be cured.  To this end, the lab has pioneered multiple optical coherence tomography (OCT) devices that enable 3D imaging at the microscopic scale in living human patients. These technologies include multimodality OCT where OCT is combined with spectroscopy, fluorescence, and other optical techniques, ultrahigh-resolution OCT (µOCT) where the resolution is sufficiently detailed to visualize individual cells, and functional OCT that measures the function and metabolism of cells in living systems. These technologies are implemented in a variety of devices (endoscopes, catheters, capsules, ...

Data Scientist Opening in Optical Coherence Tomography at Massachusetts General Hospital

Employer Description Guillermo (Gary) J. Tearney, M.D., Ph.D. Tearney Lab – Wellman Center for Photomedicine Massachusetts General Hospital  The Tearney Lab is an 80+ person multidisciplinary lab led by Guillermo (Gary) Tearney, MD, PhD. The goal of the Tearney Lab is to see every cell in the human body so that disease can be detected at its earliest stages when it can be cured.  To this end, the lab has pioneered multiple optical coherence tomography (OCT) devices that enable 3D imaging at the microscopic scale in living human patients. These technologies include multimodality OCT where OCT is combined with spectroscopy, fluorescence, and other optical techniques, ultrahigh-resolution OCT (µOCT) where the resolution is sufficiently detailed to visualize individual cells, and functional OCT that measures the function and metabolism of cells in living systems. These technologies are implemented in a variety of devices (endoscopes, catheters, capsules, ...

Intracoronary Imaging of Vulnerable Plaque—From Clinical Research to Everyday Practice

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The introduction into clinical practice of intravascular imaging, including intravascular ultrasound (IVUS), optical coherence tomography (OCT) and their derivatives, allowed for the in vivo assessment of coronary atherosclerosis in humans, including insights into plaque evolution and progression process. Intravascular ultrasound, the most commonly used intravascular modality in many countries, due to its low resolution cannot assess many features of vulnerable plaque such as lipid plaque or thin-cap fibroatheroma. Thus, novel methods were introduced to facilitate this problem including virtual histology intravascular ultrasound and later on near-infrared spectroscopy and OCT. Howbeit, none of the currently used modalities can assess all known characteristics of plaque vulnerability; hence, the idea of combining different intravascular imaging methods has emerged including NIRS-IVUS or OCT-IVUS imaging. All of those described methods may allow us to identify the most vulnerable plaq...

Endoscopic imaging of white matter fiber tracts using polarization-sensitive optical coherence tomography

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Polarization sensitive optical coherence tomography (PSOCT) has been shown to image and delineate white matter fibers in a label-free manner by revealing optical birefringence within the myelin sheath using a microscope setup. In this proof-of-concept study, we adapt recent advancements in endoscopic PSOCT to perform depth-resolved imaging of white matter structures deep inside intact porcine brain tissue ex-vivo, through a small, rotational fiber probe. The probe geometry is comparable to microelectrodes currently used in neurosurgical interventions. The presented imaging system is mobile, robust, and uses biologically safe levels of optical radiation making it well suited for clinical translation. In neurosurgery, where accuracy is imperative, endoscopic PSOCT through a narrow-gauge fiber probe could provide intra-operative feedback on the location of critical white matter structures. ( Read Full Article )

Social Issues in Optics and Photonics Salon

The Wellman Anti-Racism Effort (WARE), a collaborative team comprised of students, postdoctoral fellows, and staff at the Wellman Center for Photomedicine at Massachusetts General Hospital, is excited to advertise our ongoing seminar series, the Social Issues in Optics and Photonics Salon, hosted virtually on Thursday afternoons and evenings this fall.    For decades, the Wellman Center as a research institution has been dedicated to solving human health problems through scientific discoveries, innovation, and the development of new optical technologies. The histories of science, medicine, and technology adoption include many examples of bias, racism, misrepresentation, and exclusion of women and minority groups. As part of the broader scientific community, we invite everyone to join us in examining and reckoning with this history, with an emphasis on how it has impacted our specific field.     Our program explores several topics probing how our research is ...

Enhanced Diagnosis of Plaque Erosion by Deep Learning in Patients With Acute Coronary Syndromes

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Background Acute coronary syndromes caused by plaque erosion might be potentially managed conservatively without stenting. Currently, the diagnosis of plaque erosion requires expertise in optical coherence tomographic (OCT) image interpretation. In addition, the current deep learning (DL) approaches for OCT image interpretation are based on a single frame, without integrating the information from adjacent frames. Objectives The aim of this study was to develop a novel DL model to facilitate an accurate diagnosis of plaque erosion. Methods A novel “Transformer”-based DL model was developed that integrates information from adjacent frames emulating the cardiologists who review consecutive OCT frames to make a diagnosis and compared with the standard convolutional neural network (CNN) DL model. A total of 237,021 cross-sectional OCT images from 581 patients were used for training and internal validation, and 65,394 images from 292 patients from another dataset were used for...

Postdoctoral Research Fellowships (Optical Coherence Tomography) at Massachusetts General Hospital

Employer Description Guillermo (Gary) J. Tearney, M.D., Ph.D. Tearney Lab – Wellman Center for Photomedicine Massachusetts General Hospital  The Tearney Lab is an 80+ person multidisciplinary lab led by Guillermo (Gary) Tearney, MD, PhD. The goal of the Tearney Lab is to see every cell in the human body so that disease can be detected at its earliest stages when it can be cured.  To this end, the lab has pioneered multiple optical coherence tomography (OCT) devices that enable 3D imaging at the microscopic scale in living human patients. These technologies include multimodality OCT where OCT is combined with spectroscopy, fluorescence, and other optical techniques, ultrahigh-resolution OCT (µOCT) where the resolution is sufficiently detailed to visualize individual cells, and functional OCT that measures the function and metabolism of cells in living systems. These technologies are implemented in a variety of devices (endoscopes, catheters, capsules, ...

Massachusetts General Hosptial Receives NIH Grant for Screening for Barrett’s Esophagus Progressors with Multimodality Tethered Capsule Image-Guided Biopsy

Massachusetts General Hosptial Received a 2022 NIH Grant for $643,503 for Screening for Barrett's Esophagus Progressors with Multimodality Tethered Capsule Image-Guided Biopsy. The principal investigator is Guillermo Tearney. Below is a summary of the proposed study. Esophageal adenocarcinoma (EAC) is a deadly cancer that is preceded by a metaplastic change called Barrett's esophagus (BE). It has long been thought that endoscopic screening for BE followed by endoscopic surveillance can significantly decrease the mortality of EAC. This unfortunately has not borne out as the cost and inconvenience of conscious sedation prohibits endoscopy from being used as a population-based screening tool. BE screening may become possible in the future, owing to innovative swallowable tethered capsule endomicroscopes or cell sampling devices that can detect BE without requiring sedation. Yet, even if these capsules were to identify the large number of people in the US who have BE (~15M), endoscopic ...

Minimally Invasive Polarization Sensitive Optical Coherence Tomography (PS-OCT) for assessing Pre-OA, a pilot study on technical feasibility

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Efforts to develop chondroprotective approaches to halt osteoarthritis (OA) progression have recently increased. Current imaging techniques are critical in managing advanced OA, but greater resolution is needed to identify reversible stages (pre-OA). Optical coherence tomography (OCT) is a micron scale imaging technology widely used in ophthalmology, cardiology, and neurology. We previously demonstrated that polarization sensitive OCT (PS-OCT) can identify pre-OA in vitro, in animals, and in open surgical fields. This feasibility study examines performing intraarticular PS-OCT using a flexible endocatheter introduced through a stiff 18-gauge spinal needle. Results are critical for designing larger clinical trials examining minimally invasive PS-OCT's ability to identify pre-OA. Design Fifteen patients undergoing arthroscopic partial medial meniscectomy were selected to confirm their risk for rapid progression to OA. Magnetic resonance imaging (MRI) was obtained at time 0 and at 2.5 ...

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