Dr. Herbert C. Wolfsen Profile

Dr. Herbert C. Wolfsen

Director Photodynamic Therapy at Mayo Clinic

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Publications (6)

Proceedings Article | 7 March 2022 Presentation

Feasibility and safety of tethered capsule endomicroscopy in studying the natural history of Barrett’s esophagus: a multi-center study

Jing Dong, Catriona Grant, Barry Vuong, Norman Nishioka, Anna Huizi Gao, Matthew Beatty, Grace Baldwin, Aaron Bailargeon, Ara Bablouzian, Patricia Grahmann, Nitasha G. Bhat, Emily Ryan, Amilcar Barrios, Paola Leon Alarcon, Sarah Giddings, Tim Ford, Émilie Beaulieu-Ouellet, Seyed Hamid Hosseiny, Irene Lerman, Wolfgang Trasischker, Rohith Reddy, Kanwarpal Singh, Michalina Gora, Daryl Hyun, Lucille Quénéhervé, Michael Wallace, Wolfsen Herbert, Prateek Sharma, Kenneth Wang, Cadman Leggett, John Poneros, Julian Abrams, Charles Lightdale, Samantha Leeds, Mireille Rosenberg, Guillermo Tearney

Proceedings Volume PC11937, PC119370N (2022) https://doi.org/10.1117/12.2610595

KEYWORDS: Esophagus, Optical coherence tomography, Endoscopy, Endomicroscopy, Safety, Tissues, Imaging systems, Biopsy, Diagnostics, Yield improvement

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Proceedings Article | 4 March 2019 Presentation

Natural history of Barrett’s esophagus using tethered capsule OCT endomicroscopy and portable OCT imaging system: initial experience (Conference Presentation)

Jing Dong, Barry Vuong, Timothy Ford, Matthew Beatty, Seyed Hamid Hosseiny, Emilie Beaulieu-Ouellet, Rohith Reddy, Kanwarpal Singh, Hany Osman, Catriona Grant, Anna Huizi Gao, Samantha Leeds, Norman Nishioka, John Poneros, Julian Abrams, Charles Lightdale, Prateek Sharma, Michael Wallace, Herbert Wolfsen, Kenneth Wang, Cadman Leggett, Mireille Rosenberg, Guillermo Tearney

Proceedings Volume 10867, 108670T (2019) https://doi.org/10.1117/12.2511523

KEYWORDS: Optical coherence tomography, Esophagus, Imaging systems, Endomicroscopy, Endoscopy, Biopsy, 3D image processing, Clinical trials, Image resolution, Tissues

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While the most common method used to evaluate and survey patients with Barrett’s Esophagus (BE) is endoscopic biopsy, this procedure is invasive, time-consuming, and suffers from sampling errors. Moreover, it requires patient sedation that increases cost and mandates its operation in specialized settings. Our lab has developed a new imaging tool termed tethered capsule endomicroscopy (TCE) that involves swallowing a tethered capsule which utilizes optical coherence tomography (OCT) to obtain three-dimensional microscopic (10µm) images of the entire esophageal wall as it traverses the luminal organ via peristalsis or is retrieved by pulling up tether. As opposed to endoscopy, TCE procedure is non-invasive, doesn’t require patient sedation and mitigates sampling error by evaluating the microscopic structure of the entire esophagus. The merits of TCE make it a suitable device to investigate the microscopic natural history of BE in a longitudinal manner. Here, we present our initial experience of a multicenter (5-site) clinical trial to study the microscopic natural history of BE. The TCE device used for the study is the new generation capsule with the ball lens optical configuration and a distal scan stepper motor, which provides 30µm (lateral) resolution and 40Hz imaging rate. The portable OCT imaging system is a custom in-house built swept source system and provides 7µm (axial) at a 100 kHz A-line rate with a center wavelength of ~1310 nm. To date, we have successfully enrolled 69 subjects at all sites (MGH: 33, Columbia University: 11, Kansas City VA: 10, Mayo Jacksonville: 8, Mayo Rochester: 7) and 59 have swallowed the capsule (85.5%). There have been no reported adverse events associated with TCE procedure. High-quality OCT images were reliably obtained from patients who swallowed the device, and BE tissues were identified by expert readers. Our initial experience with TCE in a multicenter study demonstrates that this technology is easy to use and efficient in multiple clinical settings. Completion of this longitudinal study is likely to provide new insights on the temporal progression of BE that may impact management strategies.

Proceedings Article | 13 July 2009 Paper

Burn, freeze, or photo-ablate?: comparative symptom profile in Barrett's dysplasia patients undergoing endoscopic ablation

Kanwar Rupinder Gill, Seth Gross, Bruce Greenwald, Lois Hemminger, Herbert Wolfsen

Proceedings Volume 7380, 73804J (2009) https://doi.org/10.1117/12.822827

KEYWORDS: Endoscopy, Radiofrequency ablation, Photodynamic therapy, Therapeutics, Sodium, Chest, Esophagus, Liquids, Nitrogen, Laser ablation

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Proceedings Article | 13 July 2009 Paper

Variables in photodynamic therapy for Barrett's esophagus

Linda Jones, Norris Preyer, Jane Buchanan, Daryl Reynolds, Herbert Wolfsen, Michael Wallace, Kanwar R. Gill

Proceedings Volume 7380, 73800N (2009) https://doi.org/10.1117/12.822934

KEYWORDS: Scattering, Esophagus, Tissues, Reflectivity, Picosecond phenomena, Tissue optics, Monte Carlo methods, Blood, Absorption, Light scattering

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Proceedings Article | 6 March 2006 Paper

Light dosimetry calculations for esophageal photodynamic therapy using porfimer sodium

Linda Jones, Norris Preyer, Monica Davis, Carson Grimes, Kristie Edling, Nicholas Holdgate, Michael Wallace, Herbert Wolfsen

Proceedings Volume 6139, 61391D (2006) https://doi.org/10.1117/12.660155

KEYWORDS: Photodynamic therapy, Esophagus, Tissue optics, Tumor growth modeling, Absorption, Scattering, Sodium, Monte Carlo methods, Tissues, Light scattering

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Proceedings Article | 17 May 2000 Paper

Photodynamic therapy (PDT) with endoscopic ultrasound for the treatment of esophageal cancer

Timothy Woodward, Herbert Wolfsen

Proceedings Volume 3907, (2000) https://doi.org/10.1117/12.386281

KEYWORDS: Photodynamic therapy, Cancer, Tumors, Endoscopy, Ultrasonography, Oncology, Visualization, Transducers, Radiotherapy, Endoscopes

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Showing 5 of 6 publications

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