Fetal monitoring using noninvasive imaging has been developing over the last thirty years. These studies enable future problems to be detected and prevented. This paper presents a software that uses ultrasound imaging to detect the nuchal translucency area. This area is important for the detection of trisomy 21 or Down syndrome. For this, the software implements techniques of morphological operations and the Watershed transformation. Additionally, a web platform that allows remote access to the software was developed. Finally, the detection of the area is demonstrated using the Watershed transformation.