Use of carbon dioxide as negative contrast agent for magnetic resonance cholangiopancreatography

Table 1 Comparison of distribution of intestinal fluids on magnetic resonance cholangiopancreatography images between the two groups without CO₂ and with CO₂ as negative contrast agent n (%)

Anatomic locations with intestinal fluids distribution	Patients		P-value
	Without CO2 (n = 64)	With CO2 (n = 53)
Gastric fundus	62 (97)	52 (98)	1.000
Gastric body	25 (39)	14 (26)	0.171
Gastric antrum	24 (38)	6 (11)	0.001
Duodenal bulb	53 (83)	22 (42)	< 0.001
Duodenal 2nd portion	57 (89)	45 (85)	0.584

Table 2 Comparison of the overlap with the common bile duct and the pancreatic duct between the two groups without CO₂ and with CO₂ as negative contrast agent during magnetic resonance cholangiopancreatography n (%)

Overlapping structures	Patients		P-value
	Without CO2 (n = 64)	With CO2 (n = 53)
Common bile duct	52 (81)	21 (40)	< 0.001
Pancreatic duct	12 (19)	4 (8)	0.106