title: Contrasting properties of gold nanoparticles for optical coherence tomography: phantom, in vivo studies and Monte Carlo simulation.
abstract: The possibility of using silica-gold nanoshells with 150 nm silica core size and 25 nm thick gold shell as contrasting agents for optical coherence tomography (OCT) is analyzed. Experiments on agar biotissue phantoms showed that the penetration of nanoshells into the phantoms increases the intensity of the optical coherence tomography (OCT) signal and the brightness of the corresponding areas of the OCT image. In vivo experiments on rabbit skin demonstrated that the application of nanoshells onto the skin provides significant contrasting of the borders between the areas containing nanoshells and those without. This effect of nanoshells on skin in vivo is manifested by the increase in intensity of the OCT signal in superficial parts of the skin, boundary contrast between superficial and deep dermis and contrast of hair follicles and glands. The presence of nanoshells in the skin was confirmed by electron microscopy. Monte Carlo simulations of OCT images confirmed the possibility of contrasting skin-layer borders and structures by the application of gold nanoshells. The Monte Carlo simulations were performed for two skin models and exhibit effects of nanoparticles similar to those obtained in the experimental part of the study, thus proving that the effects originate exactly from the presence of nanoparticles.
authors: Nizhny Novgorod State Medical Academy, 603005, Minin and Pozharsky square, 10/1, Nizhny Novgorod, Russia.
authors: E V
authors: EV
authors: Zagaynova
authors: M V
authors: MV
authors: Shirmanova
authors: M Yu
authors: MY
authors: Kirillin
authors: B N
authors: BN
authors: Khlebtsov
authors: A G
authors: AG
authors: Orlova
authors: I V
authors: IV
authors: Balalaeva
authors: M A
authors: MA
authors: Sirotkina
authors: M L
authors: ML
authors: Bugrova
authors: P D
authors: PD
authors: Agrba
authors: V A
authors: VA
authors: Kamensky
mesh_terms: D000818:Animals; D003198:Computer Simulation; D003287:Contrast Media; D006046:Gold; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008954:Models, Biological; D015233:Models, Statistical; D009010:Monte Carlo Method; D053758:Nanoparticles / Q000648:ultrastructure; D010316:Particle Size; D019047:Phantoms, Imaging; D011817:Rabbits; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012867:Skin / Q000166:cytology*; D041623:Tomography, Optical Coherence / Q000379:methods*
chemical_list: D003287:Contrast Media; D006046:Gold