Preliminary measurements of optical properties in human abscess cavities prior to methylene blue photodynamic therapy

Md. Nafiz Hannan; Ashwani K. Sharma; Timothy M. Baran

doi:10.1117/12.2648453

14 March 2023 Preliminary measurements of optical properties in human abscess cavities prior to methylene blue photodynamic therapy

Md. Nafiz Hannan, Ashwani K. Sharma, Timothy M. Baran

Author Affiliations +

Proceedings Volume 12359, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXXI; 123590A (2023) https://doi.org/10.1117/12.2648453
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

As part of our ongoing Phase 1 clinical trial to establish the safety and feasibility of methylene blue photodynamic therapy (MB-PDT) for human deep tissue abscess cavities, we have shown that determination of abscess wall optical properties is vital for the design of personalized treatment plans aiming to optimize light dose. To that end, we have developed and validated an optical spectroscopy system for the assessment of optical properties at the cavity wall, including a compact fiber-optic probe that can be inserted through the catheter used for the standard of care abscess drainage. Here we report preliminary findings from the first three human subjects to receive these optical spectroscopy measurements. We observed wide variability in concentrations of oxy- and deoxy-hemoglobin prior to MB administration, ranging from 7.3-213 μM and 0.1-47.2 μM, respectively. Reduced scattering coefficients also showed inter-patient variability, but recovered values were more similar between subjects (5.5-10.9 cm^-1 at 665 nm). Further, methylene blue uptake was found to vary between subjects, and was associated with a reduction in oxygen saturation. These measured optical properties, along with preprocedure computed tomography (CT) images, will be used with our previously developed Monte Carlo simulation framework to generate personalized treatment plans for individual patients, which could significantly improve the efficacy of MB-PDT while ensuring safety.

Citation Download Citation

Md. Nafiz Hannan, Ashwani K. Sharma, and Timothy M. Baran "Preliminary measurements of optical properties in human abscess cavities prior to methylene blue photodynamic therapy", Proc. SPIE 12359, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXXI, 123590A (14 March 2023); https://doi.org/10.1117/12.2648453

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