[Use of structured lights in the evaluation of thoracic deformity bound with cardiac activity. Study of apical impulse using Moiré technics]. / Utilisation des lumières structurées dans l'évaluation de la déformation thoracique liée à l'activité cardiaque. Etude de l'impulsion apicale à l'aide des techniques du Moiré.

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.

Evaluation of chest wall distortion related to cardiac activity by structured lights. A study of the apical impulse by the Moiré technique.

The use of structured lights and especially of the Moiré technique to evaluate chest wall distortion in front of the apical impulse allows a topographic study of the precordial movement in relation with cardiac activity. Shade Moiré technology offers the possibility to study a reduced area of the chest with a good enlargement effect and well contrasted fringes. Projected Moiré allows the study of an increased area of the chest (40 cm2) and provides less contrasted pictures with a reduced enlargement effect. Both techniques offer the possibility of automatic imaging. The study of a normal subject is realized with a topographic evaluation of the chest wall distortion on a endsystolic frame. 3D representation of the chest wall deformation is performed after image treatment on a endsystolic print.