title: Noncontact optical imaging in mice with full angular coverage and automatic surface extraction.
abstract: During the past decade, optical imaging combined with tomographic approaches has proved its potential in offering quantitative three-dimensional spatial maps of chromophore or fluorophore concentration in vivo. Due to its direct application in biology and biomedicine, diffuse optical tomography (DOT) and its fluorescence counterpart, fluorescence molecular tomography (FMT), have benefited from an increase in devoted research and new experimental and theoretical developments, giving rise to a new imaging modality. The most recent advances in FMT and DOT are based on the capability of collecting large data sets by using CCDs as detectors, and on the ability to include multiple projections through recently developed noncontact approaches. For these to be implemented, we have developed an imaging setup that enables three-dimensional imaging of arbitrary shapes in fluorescence or absorption mode that is appropriate for small animal imaging. This is achieved by implementing a noncontact approach both for sources and detectors and coregistering surface geometry measurements using the same CCD camera. A thresholded shadowgrammetry approach is applied to the geometry measurements to retrieve the surface mesh. We present the evaluation of the system and method in recovering three-dimensional surfaces from phantom data and live mice. The approach is used to map the measured in vivo fluorescence data onto the tissue surface by making use of the free-space propagation equations, as well as to reconstruct fluorescence concentrations inside highly scattering tissuelike phantom samples. Finally, the potential use of this setup for in vivo small animal imaging and its impact on biomedical research is discussed.
authors.affiliation: Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion Crete, Greece. heimeyer@iesl.forth.gr
authors.forename: Heiko
authors.initials: H
authors.lastname: Meyer
authors.forename: Anikitos
authors.initials: A
authors.lastname: Garofalakis
authors.forename: Giannis
authors.initials: G
authors.lastname: Zacharakis
authors.forename: Stylianos
authors.initials: S
authors.lastname: Psycharakis
authors.forename: Clio
authors.initials: C
authors.lastname: Mamalaki
authors.forename: Dimitris
authors.initials: D
authors.lastname: Kioussis
authors.forename: Eleftherios N
authors.initials: EN
authors.lastname: Economou
authors.forename: Vasilis
authors.initials: V
authors.lastname: Ntziachristos
authors.forename: Jorge
authors.initials: J
authors.lastname: Ripoll
mesh_terms: D000465:Algorithms; D000818:Animals; D002138:Calibration; D003952:Diagnostic Imaging / Q000379:methods*; D004867:Equipment Design; D049452:Green Fluorescent Proteins / Q000737:chemistry; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional; D051379:Mice; D008856:Microscopy, Fluorescence / Q000295:instrumentation / Q000379:methods; D015233:Models, Statistical; D055095:Optics and Photonics; D019047:Phantoms, Imaging; D013499:Surface Properties; D041622:Tomography, Optical / Q000295:instrumentation* / Q000379:methods
chemical_list: D049452:Green Fluorescent Proteins