3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1251-C5-1254
Appareil d'évaluation in vivo des propriétés rhéologiques du revêtement cutané par technique ultrasonoreS. DIRIDOLLOU1, M. BERSON2, D. BLACK1, Y. GALL1, L. VAILLANT3, F. PATAT2 and L. POURCELOT2
1 Centre Jean Louis Alibert, CHU Rangueil, Bâtiment L1, 31054 Toulouse, France
2 INSERM U316 et GIP Ultrasons de Tours, Faculté de Médecine, 2 bis boulevard Tonnellé, 37032 Tours cedex, France
3 Service de Dermatologie, Hôpital Trousseau, 37044 Tours, France
In certain dermatoses, the mechanical properties of the skin are markedly altered. The evaluation of these properties in-vivo requires equipment which can simultaneously measure the skin's thickness while applying a known stress to the site in question. Skin thickness can be measured with either A- or B-scan mode ultrasound, the former of which we have incorporated in a device with enables skin elasticity to be determinated. Essentially, this involves the measurement of the distance between transducer (20 Mhz) and the skin structures, before and after deformation by suction, with a resolution of 70 µm. The transducer is located inside a small, cylindrical chamber, which has a 6 mm diameter aperture below the transducer to allow contact with the skin. This device can determine, in a non-invasive way, not only which skin structures are involved in this deformation, but also the morphological variation in the subcutaneous layers and their level of involvement at different stresses. With such information, we hope to be able to propose a mechanical model and to define appropriate skin rheological parameters.
© EDP Sciences 1994