What anatomical structures are primarily evaluated through ultrasound imaging?

Ultrasound imaging is particularly effective for visualizing soft tissues and fluid-filled structures. This imaging modality utilizes high-frequency sound waves that penetrate the body and are reflected back to create images. Soft tissues, such as organs and muscles, provide a contrast that ultrasound can detect easily, while fluid-filled structures, such as cysts or blood vessels, appear highly reflective and can be visualized with clarity.

In contrast, bone structures present a significant challenge for ultrasound because they reflect sound waves rather than allowing them to pass through, making them difficult to image. Cellular structures are at a microscopic level and too small to be effectively assessed with ultrasound, which is designed for imaging larger anatomical features. Cartilage and ligaments, while softer than bone, do not contain fluid, making them less distinguishable compared to fluid-filled structures on an ultrasound image. Therefore, ultrasound is primarily utilized to evaluate soft tissues and fluid-filled structures, making this the correct choice.