left posterior oblique position, chest positions are routinely used during cardiac studies with barium.
The patient should be in the left posterior oblique position at the beginning of the exam, with the knees bent, in preparation for placement of the rectal tube. To do a barium swallow, you swallow a chalky white substance known as barium. It's often mixed with water to make a thick drink that looks like a milkshake.
Upright position is used by placing the patient in the left posterior oblique position, patient are made to drink a mouthful of thick barium while taking spot images from the cervical esophagus to the gastroesophageal junction.
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