title: Design, construction, and validation of a rotary multifunctional intravascular diagnostic catheter combining multispectral fluorescence lifetime imaging and intravascular ultrasound.
abstract: We report the development and validation of an intravascular rotary catheter for bimodal interrogation of arterial pathologies. This is based on a point-spectroscopy scanning time-resolved fluorescence spectroscopy technique enabling reconstruction of fluorescence lifetime images (FLIm) and providing information on arterial intima composition and intravascular ultrasound (IVUS) providing information on arterial wall morphology. The catheter design allows for independent rotation of the ultrasonic and optical channels within an 8 Fr outer diameter catheter sheath and integrates a low volume flushing channel for blood removal in the optical pathways. In the current configuration, the two channels consist of (a) a standard 3 Fr IVUS catheter with single element transducer (40 MHz) and (b) a side-viewing fiber optic (400 μm core). Experiments conducted in tissue phantoms showed the ability of the catheter to operate in an intraluminal setting and to generate coregistered FLIm and IVUS in one pull-back scan. Current results demonstrate the feasibility of the catheter for simultaneous bimodal interrogation of arterial lumen and for generation of robust fluorescence lifetime data under IVUS guidance. These results facilitate further development of a FLIm-IVUS technique for intravascular diagnosis of atherosclerotic cardiovascular diseases including vulnerable plaques.
authors.affiliation: Department of Biomedical Engineering, University of California, 451 Health Sciences Drive, Davis, California 95616, USA.
authors.forename: Julien
authors.initials: J
authors.lastname: Bec
authors.forename: Hongtao
authors.initials: H
authors.lastname: Xie
authors.forename: Diego R
authors.initials: DR
authors.lastname: Yankelevich
authors.forename: Feifei
authors.initials: F
authors.lastname: Zhou
authors.forename: Yang
authors.initials: Y
authors.lastname: Sun
authors.forename: Narugopal
authors.initials: N
authors.lastname: Ghata
authors.forename: Ralph
authors.initials: R
authors.lastname: Aldredge
authors.forename: Laura
authors.initials: L
authors.lastname: Marcu
mesh_terms: D000818:Animals; D057785:Catheters; D003331:Coronary Vessels / Q000033:anatomy & histology / Q000737:chemistry / Q000000981:diagnostic imaging; D004867:Equipment Design; D005240:Feasibility Studies; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence / Q000295:instrumentation* / Q000379:methods*; D013552:Swine; D018084:Ultrasonography, Interventional / Q000295:instrumentation* / Q000379:methods*