Esophageal Melanosis: An Unknown Entity

S, Ankush Agarwal; Gnanamoorthy, Kothai; K, Arun; Athani, Aishwarya V

doi:10.7759/cureus.29064

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…We hypothesize that further tuning of the back-end parameters could eventually enhance the Z-axis variation and the overall trajectory accuracy for RTAB-Map. In contrast, Cartographer demonstrates higher localization precision, with the back-end successfully optimizing large sparse pose graphs with the Ceres Solver [ 49 ] while keeping the trajectory on leveled ground (refer to Figure 7 c). As a result, it achieves superior overall localization performance as shown in Figure 8 when compared to RTAB-Map, overlaying accurately on top of the reference route map from [ 44 ], as illustrated in Figure 8 a.…”

Section: Resultsmentioning

confidence: 99%

A LiDAR-Camera-Inertial-GNSS Apparatus for 3D Multimodal Dataset Collection in Woodland Scenarios

Cristóvão,

Portugal,

Carvalho

et al. 2023

Sensors

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Forestry operations have become of great importance for a sustainable environment in the past few decades due to the increasing toll induced by rural abandonment and climate change. Robotics presents a promising solution to this problem; however, gathering the necessary data for developing and testing algorithms can be challenging. This work proposes a portable multi-sensor apparatus to collect relevant data generated by several onboard sensors. The system incorporates Laser Imaging, Detection and Ranging (LiDAR), two stereo depth cameras and a dedicated inertial measurement unit (IMU) to obtain environmental data, which are coupled with an Android app that extracts Global Navigation Satellite System (GNSS) information from a cell phone. Acquired data can then be used for a myriad of perception-based applications, such as localization and mapping, flammable material identification, traversability analysis, path planning and/or semantic segmentation toward (semi-)automated forestry actuation. The modular architecture proposed is built on Robot Operating System (ROS) and Docker to facilitate data collection and the upgradability of the system. We validate the apparatus’ effectiveness in collecting datasets and its flexibility by carrying out a case study for Simultaneous Localization and Mapping (SLAM) in a challenging woodland environment, thus allowing us to compare fundamentally different methods with the multimodal system proposed.

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Section: Resultsmentioning

confidence: 99%

A LiDAR-Camera-Inertial-GNSS Apparatus for 3D Multimodal Dataset Collection in Woodland Scenarios

Cristóvão,

Portugal,

Carvalho

et al. 2023

Sensors

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“…Each data set input–output couple [ n ( r n ), r n ], when substituted in eq , originates a nonlinear equation for the regression coefficients β m +1 . These are calculated via nonlinear least-squares, by using a trust-region convex minimization routine . After solving for the coefficients β m +1 , eq predicts the deformation of coordinates Ω( u ) for any point r ′ of the space and completes the solution of the problem.…”

Section: Resultsmentioning

confidence: 99%

“…These are calculated via nonlinear least-squares, by using a trust-region convex minimization routine. 33 After solving for the coefficients β m +1 , eq 6 predicts the deformation of coordinates Ω( u ) for any point r ′ of the space and completes the solution of the problem.…”

Section: Resultsmentioning

confidence: 99%

Inverse-Designed Metaphotonics for Hypersensitive Detection

2022

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Controlling the flow of broadband electromagnetic energy at the nanoscale remains a critical challenge in optoelectronics. Surface plasmon polaritons (or plasmons) provide subwavelength localization of light but are affected by significant losses. On the contrary, dielectrics lack a sufficiently robust response in the visible to trap photons similar to metallic structures. Overcoming these limitations appears elusive. Here we demonstrate that addressing this problem is possible if we employ a novel approach based on suitably deformed reflective metaphotonic structures. The complex geometrical shape engineered in these reflectors emulates nondispersive index responses, which can be inverse-designed following arbitrary form factors. We discuss the realization of essential components such as resonators with an ultrahigh refractive index of n = 100 in diverse profiles. These structures support the localization of light in the form of bound states in the continuum (BIC), fully localized in air, in a platform in which all refractive index regions are physically accessible. We discuss our approach to sensing applications, designing a class of sensors where the analyte directly contacts areas of ultrahigh refractive index. Leveraging this feature, we report an optical sensor with sensitivity two times higher than the closest competitor with a similar micrometer footprint. Inversely designed reflective metaphotonics offers a flexible technology for controlling broadband light, supporting optoelectronics' integration with large bandwidths in circuitry with miniaturized footprints.

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“…The overall prevalence of EM was reported to be 4% in autopsy cases, while 0.1% in Japan and 2.1% in India in endoscopic screenings. 6 …”

Section: Discussionmentioning

confidence: 99%

Esophageal Melanocytosis

Thapa,

Yadav,

Mondal

et al. 2024

Autops Case Rep

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Esophageal melanocytosis is a rare entity defined by the proliferation of a melanocytic basal layer of the esophageal squamous lining and deposition of melanin in the esophageal mucosa. Esophageal melanocytosis is considered a benign entity of unknown etiology; however, it has been reported as a melanoma precursor. We report a case of esophageal melanocytosis in a diabetic and hypertensive 67-year-old male with recurrent dizziness and syncope for the past 6 months. Given his complaint of dyspepsia, he underwent an upper gastrointestinal endoscopy, in which an esophageal biopsy revealed the diagnosis of esophageal melanocytosis. The definitive diagnosis of esophageal melanocytosis can only be made by histological analysis. The histologic differential diagnoses include melanocytic nevi and malignant melanoma. Therefore, they need to be ruled out.

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Esophageal Melanosis: An Unknown Entity

Cited by 7 publications

References 8 publications

A LiDAR-Camera-Inertial-GNSS Apparatus for 3D Multimodal Dataset Collection in Woodland Scenarios

A LiDAR-Camera-Inertial-GNSS Apparatus for 3D Multimodal Dataset Collection in Woodland Scenarios

Inverse-Designed Metaphotonics for Hypersensitive Detection

Esophageal Melanocytosis

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