Study on the Effect of Micro-Vessels on Ablation Effect in Laser Interstitial Brain Tissue Thermal Therapy Based on PID Temperature Control

Laser interstitial thermal therapy (LITT) is an emerging clinical treatment for deep brain tumors, which safe, minimally invasive, and effective. This paper established a three-dimensional model based on the LITT heat transfer model, including tissue, laser fiber, straight tube vessels. Combining PID control equation, diffuse approximation Pennes Murray’s law, effect of micro-vessel radius distance between vessels fiber ablation temperature field during was investigated by using COMSOL finite element software. The results showed that at constant 1 mm vessel with 0.1–0.2 could be completely coagulated, 0.3–0.6 had cooling directional effects distribution damage, 0.7–1.0 temperature. When vessel-fiber spacing raised 2 mm, 0.3–0.4 vasculature influence field; when 3 only 0.3 field. range impacted blood flow diminishes as optical artery grows. zone eventually tends to left right symmetrical. In this study, we simulated influenced tiny control. We initially classified vessels, provided some guidance accurate prediction helped accuracy preoperative planning.