Characterization of measurement artefacts in fluoroptic temperature sensors: Implications for laser thermal therapy at 810 nm

Abstract

The measurement artefact experienced by both black-capped and clear-capped fluoroptic sensors irradiated by NIR light scales with fluence rate and is due to direct absorption of the laser light, which results in sensor self-heating. Clear-capped fluoroptic sensors can be used to accurately monitor LITT in tissue but should be shielded from ambient light.

Thermometry and ablation monitoring with ultrasound

“…Significant distortion of the HIFU field was reported for metallic thermocouple probes larger than $\sqrt{\lambda }/2$, but probes smaller than $\sqrt{\lambda }/5$ produced only local perturbations that are thought to have negligible effect on the overall thermal distribution (9) but may create a discrepancy between the temperature at the probe and the surrounding tissue (10). Fiber-optic probes are generally insensitive to environmental electromagnetic interference, but can be influenced by light in the case of laser thermal therapy (11). …”

Photoacoustic detection of protein coagulation in albumen-based phantoms

“…Various minimally or non-invasive methods of guiding and monitoring TT are being investigated including fluoroptic temperature sensors, magnetic resonance temperature imaging, the use of radiance/fluence probes and ultrasound imaging. [10][11][12][13] There are several benefits in using PAT as a guiding and monitoring system in TT. It has the potential to accurately discriminate a tumour from the surrounding normal tissue and then provide an effective means of real-time mapping of treatment progression since the changes in the tumour optical and mechanical properties can be identified.…”

Quantitative comparison of delta P1 versus optical diffusion approximations for modeling near‐infrared gold nanoshell heating

“…4 In this portion of the spectrum, absorption by tissue is minimized, leading to less tissue heating and better penetration. 5,6 This preferential heating of the nanoshells, which results in a differential absorption means the nanoshells act like a distributed heat source facilitating targeted tissue heating at a distance from the photon source. Delivery of these nanoshells into parenchyma or solid tumors can be accomplished by intratumoral or intravenous injections; for the current work we specifically model nanoshell concentrations for intravenous injections.…”