Tissue imaging is a field of research that focuses on visualizing and analyzing the structure and composition of tissues at the cellular and molecular level. This is typically done using advanced imaging techniques such as microscopy, spectroscopy, and imaging mass spectrometry. Tissue imaging allows researchers to study the organization and function of tissues in health and disease, and can provide valuable insights into the underlying mechanisms of various biological processes. It is used in a wide range of fields including medicine, biology, and pharmaceutical research.