Can a hiatus hernia be detected using just a scan?

Yes it can be: Even though hiatus hernia can be detected by mri, cat scan, ultrsonography.It does not offer any advantages over upper GI xrays and endoscopy.

Ct scan: Cr scan can be utilized to detect a hiatal hernia. A gastroscopy can also detect it and tell you how far down and the condition of the stomach and esophagus. A ph probe will tell you if the reflux is causing harm. Eat well and exercise.