What is a notable historical aspect of the development of sonography?

The development of sonography is particularly noted for its early application in the field of obstetrics during the 1950s. This period marked a significant advancement in medical imaging, as ultrasound technology began to be utilized to visualize the developing fetus, providing valuable information that was previously inaccessible. The use of ultrasound in obstetrics allowed for non-invasive monitoring of pregnancy, helping to assess fetal growth and wellbeing, which informed clinical decisions and improved prenatal care.

While other advancements in ultrasound technology did occur later, including developments in the 1970s and various applications such as cardiac evaluation, the pioneering use of ultrasound in obstetrics stands out as a landmark moment. The notion that sonography was created in the 19th century does not accurately reflect the specific technological advancements that led to its use in a medical context, particularly the innovations of the mid-20th century. Thus, the correct answer highlights a crucial historical milestone in the use of ultrasound in medicine.