Ablation dynamics during laser interstitial thermal therapy for mesiotemporal epilepsy.

Area of Science:

• Neurosurgery
• Medical Imaging
• Thermal Ablation

Background:

• Laser interstitial thermal therapy (LITT) is a key treatment for brain tumors and epilepsy, enabled by MRI thermal imaging.
• Predicting LITT outcomes is challenging due to variations in brain tissue thermal properties.

Purpose of the Study:

• To analyze short- and long-term effects of LITT using intraoperative thermal damage estimate (TDE) maps in the mesiotemporal lobe.
• To identify preoperative variables that predict tissue response to thermal energy during LITT.

Main Methods:

• Co-registered intraoperative TDE maps and pre-, intra-, and post-operative MRIs for 30 epilepsy patients treated with LITT.
• Quantified ablation dynamics using TDE pixel time series and analyzed relationships with 16 preoperative variables.

Main Results:

• TDE maps closely matched immediate ablation zones but were larger than delayed ablation cavities, especially in the amygdala and hippocampus.
• TDEs better predicted delayed LITT effects in patients with smaller perihippocampal CSF spaces.
• Ablation speed varied based on preoperative T2 MRI signal, proximity to CSF, laser trajectory, and target MRI signal.

Conclusions:

• Patient-specific anatomical and pathological variations influence LITT thermal coagulation.
• Integrating demographic and imaging data into predictive models can enhance LITT precision and outcomes.