How do I image deep within living, scattering tissue?

Achieving optically sectioned fluorescence imaging deep within intact, scattering living tissue such as brain.

References

• So, P.T., Dong, C.Y., Masters, B.R., Berland, K.M. "Two-Photon Excitation Fluorescence Microscopy." Annual Review of Biomedical Engineering 2 (2000): 399–429.