Dr. Oscar M. Caravaca Mora Profile

Dr. Oscar M. Caravaca Mora

Research Fellow at Wellman Ctr for Photomedicine

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Publications (8)

Proceedings Article | 13 March 2024 Presentation

Micro-optical coherence tomography capsule for sedation-free esophagus imaging

Hinnerk Schulz-Hildebrandt, Oscar Caravaca Mora, Alejandro Ortega, Ashwin Panikkar, Edward Farewell, Guillermo Tearney

Proceedings Volume PC12820, PC128200B (2024) https://doi.org/10.1117/12.3002695

KEYWORDS: Esophagus, Tomography, Optical coherence, Endoscopy, Cancer, Image resolution, Diseases and disorders, Collimators, Spectroscopy, Spatial resolution

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SPIE Journal Paper | 19 January 2023 Open Access

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

Oscar Caravaca-Mora, Philippe Zanne, Guiqiu Liao, Natalia Zulina, Lucile Heroin, Lucile Zorn, Michel De Mathelin, Benoit Rosa, Florent Nageotte, Michalina Gora

JOM, Vol. 3, Issue 01, 011005, (January 2023) https://doi.org/10.1117/12.10.1117/1.JOM.3.1.011005

KEYWORDS: Optical coherence tomography, Endoscopy, Endoscopes, Robotics, Teleoperation, Optical microsystems, Optical coherence, Imaging systems, Tissues, Equipment

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SignificanceEndoscopic 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.AimThis 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.ApproachA geometrical model of the steerable OCT catheter was developed for estimating the volume of the accessible workspace. Experimental validation was done using electromagnetic tracking of the catheter’s positions. An exemplary scanning path was then selected within the available workspace to evaluate motion performance with the robotized steerable OCT catheter. Automatic scanning is compared to a teleoperated one and a manual scanning with a nonrobotized flexible endoscope. Spectral arc length, scanning area, spacing between scan trajectories, and time are metrics used to quantify performance.ResultsThe available scanning workspace was experimentally estimated to be 255 cm3. The automatic scanning mode provided the highest accuracy and smoothness of motion with spectral arc length of −3.18, covered area of 10.11 cm2, 1.54 mm spacing between 15 sweep trajectories, maximum translation of 27.99 mm, and time to finish of 3.11s.ConclusionsAutomatic modality improved the accuracy of scanning within a large workspace. The robotic capability provided better control to the user to define spacing resolution of scanning patterns.

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Proceedings Article | 7 March 2022 Presentation

Colon lumen exploration with robotized optical coherence tomography catheter

Guiqiu Liao, Zhongkai Zhang, Oscar Caravaca Mora, Philippe Zanne, Benoit Rosa, Diego Dall’Alba, Paolo Fiorini, Michel de Mathelin, Florent Nageotte, Michalina Gora

Proceedings Volume PC11937, PC119370L (2022) https://doi.org/10.1117/12.2609991

KEYWORDS: Optical coherence tomography, Tissues, Colon, Robotics, Algorithm development, Positive feedback, Optical phantoms, Neural networks, Negative feedback, Image processing

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Proceedings Article | 7 March 2022 Presentation

Coordinates encoding networks: an image segmentation architecture for side-viewing catheters

Guiqiu Liao, Beatriz Farola Barata, Oscar Caravaca Mora, Philippe Zanne, Benoit Rosa, Diego Dall’Alba, Paolo Fiorini, Michel de Mathelin, Florent Nageotte, Michalina Gora

Proceedings Volume PC11937, PC1193708 (2022) https://doi.org/10.1117/12.2608993

KEYWORDS: Image segmentation, Computer programming, Network architectures, Tissues, Optical coherence tomography, Ultrasonography, Transform theory, Tissue optics, Neural networks, Image analysis

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Proceedings Article | 7 March 2022 Presentation

Design and optimization of improved-resolution extended depth-of-field optical coherence tomography probes for imaging in swine esophagus

Chukwuemeka Okoro, Rachel Smith, Nitasha Bhat, Guillermo Tearney, Oscar Caravaca Mora

Proceedings Volume PC11951, PC119510G (2022) https://doi.org/10.1117/12.2609792

KEYWORDS: Optical coherence tomography, Esophagus, Optical design, Waveguides, Wave propagation, Spatial frequencies, Performance modeling, Optimization (mathematics), Optical simulations, Near field

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Proceedings Article | 5 March 2021 Presentation

Rotational distortion compensation with deep learning for proximal-scanning endoscopic optical coherence tomography

Guiqiu Liao, Oscar Caravaca Mora, Philippe Zanne, Benoit Rosa, Diego Dall'Alba, Paolo Fiorini, Michel de Mathelin, Florent Nageotte, Michalina Gora

Proceedings Volume 11620, 1162005 (2021) https://doi.org/10.1117/12.2576882

KEYWORDS: Optical coherence tomography, Distortion, Endoscopy, Robotics, Video, Evolutionary algorithms, Detection and tracking algorithms, Optical scanning systems, Optical flow, Optical fibers

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Proceedings Article | 5 March 2021 Presentation

OCT image-guidance of needle injection for robotized flexible interventional endoscopy

Oscar Caravaca Mora, Maxime Abah, Lucile Heroin, Guiqiu Liao, Zhongkai Zhang, Philippe Zanne, Benoit Rosa, Diego Dall'Alba, Paolo Fiorini, Michel de Mathelin, Michele Diana, Florent Nageotte, Michalina Gora

Proceedings Volume 11620, 116200D (2021) https://doi.org/10.1117/12.2576186

KEYWORDS: Optical coherence tomography, Endoscopy, Endoscopes, Cameras, Visualization, Tissue optics, Tissues, Image segmentation, Colorectal cancer, Colon

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Proceedings Article | 19 July 2019 Paper

Colorectal polyps mimicking phantoms for OCT application

Natalia Zulina, Oscar Caravaca, Sara Gravelyn, Lucile Zorn, Michalina Gora

Proceedings Volume 11073, 110731H (2019) https://doi.org/10.1117/12.2527098

KEYWORDS: Optical coherence tomography, Colon, Imaging systems, Tissue optics, Optical properties, Tissues, Endoscopy, Skin, Silicon, Scattering

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