Optical-thermal simulation of human tonsillar tissue irradiation: clinical implications

Area of Science:

• Biomedical Engineering
• Laser Medicine
• Surgical Innovation

Background:

• Mucosa intact laser tonsillar ablation is an emerging alternative to conventional tonsillectomy.
• Previous efficacy studies were conducted in canines.
• Establishing safety for human tonsil irradiation is critical.

Purpose of the Study:

• To determine the optimal dosimetry parameters for safe irradiation of human tonsillar tissue using the MILTA technique.
• To investigate the effect of varying power and time parameters on tissue response.
• To build upon existing optical-thermal simulations.

Main Methods:

• An established optical-thermal simulation model was utilized.
• Simulations involved irradiating tonsillar tissue at power levels of 5-25 watts for 1 minute.
• Further simulations examined 10 watts for durations ranging from 10 seconds to 162 seconds.

Main Results:

• Irradiation at 15 watts and above resulted in peak temperatures exceeding 100°C and mucosal temperatures over 70°C.
• Temperature variations at depth within the tonsil were not significant.
• Peak temperatures consistently occurred at a depth of 1 mm.
• Extended irradiation times did not substantially alter the radial temperature profile.

Conclusions:

• The optimal dosimetry for human tonsillar tissue irradiation at 805 nm using the MILTA technique is below 15 watts for approximately 1 minute.
• These parameters are crucial for ensuring mucosal safety during laser tonsillar ablation.
• This study provides essential data for the clinical application of MILTA.