Multimodal Detection for Cryptogenic Epileptic Seizures Based on Combined Micro Sensors

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Imaging

Background:

• Cryptogenic neocortical epilepsy presents challenges in localizing seizure foci due to unobserved lesions.
• Electrocorticography (ECoG) is a gold standard for seizure focus localization but has limitations in resolution and depth information.

Purpose of the Study:

• To develop a new method for higher-resolution, depth-informed seizure focus localization.
• To leverage the neurovascular coupling mechanism to link neural activity with cerebral blood volume changes.

Main Methods:

• Utilized an implantable micro ultrasound transducer (MUT) and a photoplethysmogram (PPG) device.
• Investigated the neurovascular coupling mechanism relating intense neural activity to cerebral blood volume (CBV).
• Conducted phantom experiments and in vivo studies to verify the efficacy of MUT and PPG sensors.

Main Results:

• MUT successfully detected blood concentration changes at a depth of 12 mm in phantom experiments.
• PPG and MUT showed consistent superficial blood concentration trends within 2.5 mm in phantom studies.
• In vivo experiments demonstrated that MUT and PPG recorded blood changes correlated with ECoG-seizure status.

Conclusions:

• The combined MUT and PPG method offers improved resolution and depth information for seizure focus localization.
• This novel approach effectively utilizes the neurovascular coupling mechanism for epilepsy research.
• The study confirms the effectiveness of integrated micro-sensors for enhanced epilepsy diagnosis.