title: Special issue introduction: Photoacoustic microscopy.
authors.affiliation: Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA, USA.
authors.forename: Hao F
authors.initials: HF
authors.lastname: Zhang
authors.affiliation: Institute for Biological and Medical Imaging (IBMI), Technical University of Munich and Helmholtz Center Munich, 85764 Neuherberg, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Razansky