An imaging procedure displaying the continuous motion of internal structures is:

The answer is "Fluoroscopy."

Explanation:

Fluoroscopy- This is an imaging technique that uses an X-ray beam (often used in diagnostic radiology) in order to detect the motion of internal body structures. This beam passes through the body and with the help of the C-arm (an imaging scanning intensifier), the internal structures can be seen at varying angles. Many people say it is similar to a movie so it is often called an "x-ray movie."

Fluoroscopy is used in many types of diagnostic examinations and procedures such as:

Cardiac cathetirization- This is often used in the treatment of heart disease.

Arthrography- This is used to check the condition of the joints.

Hysterosalpingogram- This is used to check the condition of the fallopian tubes (transports the ova from the ovary to the uterus) and uterus (where eggs are fertilized) of women.

steady state because it the only on that maes sense