Optical Imaging Overview

Principles

Definition

Optical imaging is a methodological approach and research field that utilizes light and its interaction with matter to generate visual representations of structures, processes, or properties within biological systems, materials, or other objects. This technique is significant for its ability to provide high-resolution, often non-invasive, insights into phenomena across various scales, enabling the investigation of cellular dynamics, tissue morphology, and material characteristics.

Ontological type

Core Methods

Instrumentation

Resolution and Contrast

Key developments

Key Figures

Contrast and Resolution Emergence era

Stefan W. Hell [1] emerged as a pivotal figure in optical imaging during the Contrast and Resolution Emergence era (1980-1996), with affiliations at Heidelberg University [2] and the University of Oxford [3]. His 1994 paper, Breaking the diffraction resolution limit by stimulated emission: stimulated-emission-depletion fluorescence microscopy [4], demonstrated a nonlinear contrast approach that broke the diffraction barrier and catalyzed nanoscale imaging within this era. This contribution provided a practical route to super-resolution by leveraging stimulated-emission concepts to control fluorescence, enabling sharper images and functional mapping opportunities that defined the era's trajectory [4]. Hell's work [1] during 1980-1996 established foundational principles for later advances in subdiffraction imaging and informed instrument design across biological tissue studies in this era [4].

Label-Free Multimodal Integration era

Lihong V. Wang[1], whose research during this era spanned Massachusetts Institute of Technology[3] and Washington University in St. Louis[4], is a leading figure in optical imaging. His key contribution was the development of noninvasive laser-induced photoacoustic tomography for structural and functional in vivo brain imaging, as demonstrated in the 2003 paper 'Noninvasive laser-induced photoacoustic tomography for structural and functional in vivo imaging of the brain'[7]. George Stoica[2], associated with the Texas A&M University System[5] and the University of British Columbia[6] during this era, contributed as a co-author on the same photoacoustic tomography work. As a co-author on the 2003 photoacoustic tomography paper[7], Stoica helped advance label-free multimodal imaging in scattering tissue by enabling in vivo functional brain mapping with depth-resolved contrast.

Deep Real-Time Nanoscopy era

Mathias Fink [1] is associated with Stanford University [3] and Université Paris Cité [4] during the Deep Real-Time Nanoscopy era. Their key contributions in this era include Controlling waves in space and time for imaging and focusing in complex media [7], which advanced wavefront shaping to mitigate scattering and enable deeper, real-time imaging in challenging media. Jie Tian [2] is associated with Johns Hopkins University [5] and University of Science and Technology of China [6] during this era. Their key contributions in this era include First-in-human liver-tumour surgery guided by multispectral fluorescence imaging in the visible and near-infrared-I/II windows [8], enabling real-time, image-guided surgery and advancing multispectral fluorescence imaging toward clinical use.