Characterization of Fetal Lung With Quantitative Ultrasound

The intervention consists of a regular abdominal ultrasound scan for fetal evaluation. The difference with a regular scan is that the scanner used to image the fetus provides access to raw/unprocessed ultrasound echo data that can be extracted from the scanner and processed offline (after acquisition) to extract compute backscatter quantitative ultrasound (bQUS) features. Thus, data acquisition does not represent a significant departure from conventional fetal imaging protocols. Other than the time needed to acquire the images, the participant will not perceive any difference from a regular fetal ultrasound scan.