Journal Article photoacoustic imaging Biocompatible Materials Fluorescent Dyes Lanthanoid Series Elements MRI NIR-II NIR-II fluorescence imaging NIR-IIb fluorescence Polymers Quercus alba Quercus rubra Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. aggregation-induced emission bio-orthogonal labeling brain tumor brain tumors cerebrovascular structures drought early-stage brain tumors ectomycorrhizal fungi ellagitannins fine roots fluorescence and photoacoustic imaging focused ultrasound lanthanide-doped nanoparticles lignin nanoparticles photothermal therapy