In vivo detection of human papilloma virus-induced lesions of anogenital area after application of acetic acid: a novel and accurate approach to a trivial method.

Human papilloma virus infection is increasing at an alarming rate. The ability of the virus to establish a subclinical infection and its association with malignancy of the lower genital tract make the statistics even more worrisome. Topical application of acetic acid solution provokes temporal alterations of the light-scattering properties of human papilloma virus-induced lesions of anogenital area. For the in vivo study of the phenomenon, an imaging system has been employed, which performs time-lapse imaging and enables the calculation and display of the kinetics of the provoked alterations in any point within the examined area. Confirmation of diagnosis has been established with conventional histology and polymerase chain reaction. It has been shown that the method provides early detection and staging of skin alteration or transformation due to human papilloma virus infection and enables mapping of the infected area.

Assessment of nasal mucosa blood supply by quantitative endoscopic imaging of the back-scattered light.

In this article we present a method for the objective assessment and monitoring of tissue blood supply using a specially developed endoscopic imaging colorimeter that enables quantitative color modeling of the back-scattered light during endoscopic examination. Tissue blood volume changes in the nasal mucosa, induced by xylometazoline hydrochloride nasal spray, were evaluated with this method. It was found that quantitative imaging provides sensitive, reproducible, and reliable means for the monitoring and mapping of tissue blood supply and is easy to use routinely. The results showed that saturation decreases with time, being the most sensitive color parameter to the vasoconstriction procedure. It appears that objective indexes for optical tissue characterization and analysis may be promising in the understanding of the pathophysiology of tissue changes and in the objective evaluation of their response to different therapeutic schemes.

In vivo detection and staging of epithelial dysplasias and malignancies based on the quantitative assessment of acetic acid-tissue interaction kinetics.

A novel approach to the problem of non-destructive detection and staging of tissue lesions is presented. The method relies on the in vivo quantitative assessment of the spatial and temporal alterations of light-scattering properties, induced in epithelial dysplasias and malignancies of the cervix and larynx, after topical application of acetic acid solution. Initial clinical trials show that the method is capable of detecting incipient lesions and that differences in the dysplasia and malignancy grade are clearly manifested in the measured temporal characteristics of the phenomenon.

Photodynamic treatment of skin malignancies with aminolevulinic acid. Emphasis on anatomical observations and in vivo erythema visual assessment.

BACKGROUND: Photodynamic therapy with delta-aminolevulinic acid is a promising alternative treatment for superficial skin malignancies. OBJECTIVE: Further clinical experience, study of tissue alterations leading to recovery, and correlation/prediction of the therapeutic response through in vivo skin color changes as represented by erythema development. METHODS: The therapeutic procedure, sequential histology and histochemistry, and the development of a remote machine vision system to measure, map, and monitor the erythema development. RESULTS/CONCLUSIONS: A high cure response rate with adequate follow-up was shown. A significant correlation of the clinical-histologic response of tumors subjected to treatment with the erythema measurements implies that erythema inspection and quantitative analysis offer a reliable predictor of the therapeutic outcome and a clue for optimization of this treatment modality.