Which of the following is a characteristic feature of an abdominal ultrasound?

Real-time imaging is a fundamental characteristic of abdominal ultrasound. This feature allows healthcare professionals to visualize internal structures and organs dynamically as they move, enabling the evaluation of physiology in motion rather than just static images. This capability is crucial for assessing various conditions, such as blood flow in vessels, the movement of the heart, and the dynamics of gastrointestinal organs.

In contrast, high radiation exposure, requiring contrast agents for all exams, and being an invasive procedure are not associated with abdominal ultrasound. Ultrasound utilizes sound waves rather than ionizing radiation, making it a safer imaging option. Additionally, while contrast agents can enhance certain ultrasounds, they are not universally required for every examination. Lastly, ultrasound is a non-invasive diagnostic tool, which is part of its appeal in clinical practice.