A protocol for ultrasound-guided, minimally invasive tissue sampling (MITS) can be found in this new publication from the NATON consortium:
Schädler, J., Azeke, A.T., Ondruschka, B. et al. Concordance between MITS and conventional autopsies for pathological and virological diagnoses. Int J Legal Med (2023). https://doi.org/10.1007/s00414-023-03088-w