Pregnant Obese Women and Fetal Ultrasound Quality.

"Obese pregnant women will be included before the second trimester fetal ultrasound examination.~Women will be allocated to one intervention group or to the control group. In the intervention group, the ultrasonographer will be able to use several ultrasound propagation velocities to perform the exam.~In the control group, exam will be performed using the conventional ultrasound velocity.~An exam will be considered to be complete if all the images recommended by national guideline are acquired. If ultrasound images are missing, other ultrasound exams may be performed until completeness is reached.~The protocol will be applied for the second and the third fetal ultrasound examination which are recommended by national guideline.~All scans will be evaluated by two independent experts who do not have performed any of the exams. They will evaluate the completeness of each exam. Each scan will be quoted using the quality score proposed by Salomon et al."