all of the following statements regarding large-bowel radiography are true except:
a- the large bowel must be completely empty prior to examination
b- retained fecal material can simulate pathology
c- single-contrast studies help to demonstrate polyps
d- double-contrast studies help to demonstrate intraluminal lesions
a- the large bowel must be completely empty prior to examination
b- retained fecal material can simulate pathology
c- single-contrast studies help to demonstrate polyps
d- double-contrast studies help to demonstrate intraluminal lesions
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