In Situ Terahertz Monitoring of an Ice Ball Formation During Tissue Cryosurgery: a Feasibility Test

Overview

Journal J Biomed Opt

Specialties Biomedical Engineering
Ophthalmology

Date 2021 Jan 28

PMID 33506657

Citations 2

Authors

Arsen K Zotov

Arsenii A Gavdush

Gleb M Katyba

Larisa P Safonova

Nikita V Chernomyrdin

Irina N Dolganova

Affiliations

Soon will be listed here.

Abstract

Significance: Uncontrolled cryoablation of tissues is a strong reason limiting the wide application of cryosurgery and cryotherapy due to the certain risks of unpredicted damaging of healthy tissues. The existing guiding techniques are unable to be applied in situ or provide insufficient spatial resolution. Terahertz (THz) pulsed spectroscopy (TPS) based on sensitivity of THz time-domain signal to changes of tissue properties caused by freezing could form the basis of an instrument for observation of the ice ball formation.

Aim: The ability of TPS for in situ monitoring of tissue freezing depth is studied experimentally.

Approach: A THz pulsed spectrometer operated in reflection mode and equipped with a cooled sample holder and ex vivo samples of bovine visceral adipose tissue is applied. Signal spectrograms are used to analyze the changes of THz time-domain signals caused by the interface between frozen and unfrozen tissue parts.

Results: Experimental observation of TPS signals reflected from freezing tissue demonstrates the feasibility of TPS to detect ice ball formation up to 657-μm depth.

Conclusions: TPS could become the promising instrument for in situ control of cryoablation, enabling observation of the freezing front propagation, which could find applications in various fields of oncology, regenerative medicine, and THz biophotonics.

Citing Articles

Optical Sensing of Tissue Freezing Depth by Sapphire Cryo-Applicator and Steady-State Diffuse Reflectance Analysis.

Zotov A, Pushkarev A, Alekseeva A, Zaytsev K, Ryabikin S, Tsiganov D Sensors (Basel). 2024; 24(11).

PMID: 38894444 PMC: 11175356. DOI: 10.3390/s24113655.

Temperature dependent terahertz spectroscopy and imaging of orthotopic brain gliomas in mouse models.

Wu L, Wang Y, Liao B, Zhao L, Chen K, Ge M Biomed Opt Express. 2022; 13(1):93-104.

PMID: 35154856 PMC: 8803010. DOI: 10.1364/BOE.445597.

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