Final answer:
Pelvic ultrasonography is the diagnostic imaging procedure that uses sound waves to make images of organs in the pelvic region, suitable for use during pregnancy due to its safety and non-invasive approach.
Step-by-step explanation:
The diagnostic imaging procedure that uses sound waves to create images as the waves bounce off organs in the pelvic region is pelvic ultrasonography. This technique employs high-frequency sound waves that are transmitted into the body, generating echoes that are converted by a computer into real-time images of anatomy and physiology. Pelvic ultrasonography is widely used for sensitive situations, including monitoring fetal growth and development during pregnancy, due to its non-invasive nature and the absence of electromagnetic radiation. Ultrasound technology can visualize the shape and density of internal structures, making it a safe option compared to other imaging studies during pregnancy, like CT scans or PET scans, which involve radiation exposure.