title: In vivo non-invasive monitoring of collagen remodelling by two-photon microscopy after micro-ablative fractional laser resurfacing.
abstract: Non-linear optical microscopy is becoming popular as a non-invasive in vivo imaging modality in dermatology. In this study, combined TPF and SHG microscopy were used to monitor collagen remodelling in vivo after micro-ablative fractional laser resurfacing. Papillary dermis of living subjects, covering a wide age range, was imaged immediately before and forty days after treatment. A qualitative visual examination of acquired images demonstrated an age-dependent remodelling effect on collagen. Additional quantitative analysis of new collagen production was performed by means of two image analysis methods. A higher increase in SHG to TPF ratio, corresponding to a stronger treatment effectiveness, was found in older subjects, whereas the effect was found to be negligible in young, and minimal in middle age subjects. Analysis of collagen images also showed a dependence of the treatment effectiveness with age but with controversial results. While the diagnostic potential of in vivo multiphoton microscopy has already been demonstrated for skin cancer and other skin diseases, here we first successfully explore its potential use for a non-invasive follow-up of a laser-based treatment.
authors: National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125, Florence, Italy; European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy. riccardo.cicchi@ino.it.
authors: Riccardo
authors: R
authors: Cicchi
authors: Dimitrios
authors: D
authors: Kapsokalyvas
authors: Michela
authors: M
authors: Troiano
authors: Piero
authors: P
authors: Campolmi
authors: Cristiano
authors: C
authors: Morini
authors: Daniela
authors: D
authors: Massi
authors: Giovanni
authors: G
authors: Cannarozzo
authors: Torello
authors: T
authors: Lotti
authors: Francesco Saverio
authors: FS
authors: Pavone
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D003094:Collagen / Q000737:chemistry*; D005260:Female; D006801:Humans; D053685:Laser Therapy / Q000379:methods; D007834:Lasers; D008297:Male; D008853:Microscopy / Q000379:methods*; D008875:Middle Aged; D017785:Photons; D012867:Skin / Q000473:pathology* / Q000528:radiation effects*; D015595:Skin Aging / Q000528:radiation effects; D016896:Treatment Outcome
chemical_list: D003094:Collagen
keywords: SHG microscopy; collagen; dermatology; lasers in medicine