Fig. 1. Principle of the optical ultrasonic testing

Fig. 2. Animal experiment. (a) Animal experiment model setup; (b) animal experiment in vivo

Fig. 3. Correspondence among electrical signal, optical signal, and ultrasound signal during the seizure and non-seizure periods of epilepsy

Fig. 4. Correspondence between ultrasound and electrical signals in blood flow. (a) 0--1 mm below the cortex surface; (b) 0.5--1.5 mm below the cortex surface; (c) 1--2 mm below the cortex surface; (d) 1.5--2.5 mm below the cortex surface