ThOracic Ultrasound in Idiopathic Pulmonary Fibrosis Evolution

"For each usual consultation every 3 months, the patient will have clinical examination and pulmonary function tests (CPI score). Thoracic ultrasound will be made during the consultation (M0, M3, M6, M9 and M12). The presence, gravity and localisation of each ultrasound sign will be described. CT-scan data will be collected in the 3 months before the start of the study and during the study. To be enrolled in the study does not change to the usual follow-up.~For the thoracic ultrasound, a convex probe will be used (1 to 5 MHz). Patient will be layed down in a right lateral prone position then left. Thoracic ultrasound will be timed, saved and anonymized. 14 intercostal spaces will be explored by experimented operator.~The records will be seen a second time by same operator then a second operator. this will measured interoperator and intraoperator variability."