Add imaging-guided tFUS targeting

[charlesbmi]

Describe the new feature or enhancement

Estrada et al. (2021) visualize their tFUS using simultaneous calcium imaging. Clinical applications often use MR to fine-tune tFUS delay sequences. One could speed up targeting through active learning; active learning is common in protein engineering to reduce the number of wet-lab experiments needed, also in spinal neurostimulation to find optimal parameters quicker.