Summary: How can imaging be used as a measure of Eustachian tube function? (a) Clinical tests • Plain film radiograph and scintigraphy tests have shown the greatest promise, but have not been developed and therefore have not entered clinical use (b) Research and developing techniques • Imaging has greatly added to our understanding of ET function and research is ongoing • Dynamic imaging using new CT and MRI rapid acquisition techniques is beginning to provide new insight into ET function, and may yet provide a clinical test that allows diagnosis of ETD, and targeting of treatments