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Figure 2a. Secretin-enhanced MR cholangiopancreatographic images obtained at 0 (a), 3 (b), 7 (c), and 10 (d) minutes after intravenous secretin injection. The pancreatic duct (arrowhead) is most visible at 5–7 minutes, when maximum response to secretin occurs. Note the progressive filling of the duodenum with high-signal-intensity fluid (arrows). The exocrine response to secretin can be semiquantitatively determined from the amount of high signal intensity in the duodenum after secretin injection.
