[Use of structured lights in the evaluation of thoracic deformity bound with cardiac activity. Study of apical impulse using Moiré technics].

Chest deformation due to cardiac activity can be studied with the use of techniques based on Moiré principle. The shadow technique allows to obtain well contrasted fringes, whereas the technique of projected Moiré allows an easier taking of camera pictures. The fringes in this case, although less contrasted, allow to recognize level differences of the order of 0.17 mm with a network of 20 traits/mm in the present configuration of our material. The best criteria of registration have been set up after the study of 10 young subjects. In the presented case topographic measurements allowed a quantitative evaluation of the apical impulse. The telesystolic image after treatment allowed a tridimensional reconstruction of chest deformation.