Final answer:
A barium swallow is the typical imaging study used to diagnose Zenker's diverticulum, where barium sulfate allows for clear visualization of the esophagus in X-ray images. The correct option is B.
Step-by-step explanation:
The imaging study typically used to determine the presence of a Zenker's diverticulum is a barium swallow. This procedure involves the patient swallowing barium sulfate, which coats the esophageal walls and allows for clear X-ray images to be taken.
The barium highlights any pouches or bulges in the esophagus that indicate a diverticulum. Other imaging studies like CAT scans, PET scans, and carotid angiograms are not commonly used for diagnosing Zenker's diverticulum.
Therefore, the correct option is B.