MR signal changes on hepatobiliary imaging after oral ingestion of manganese chloride tetrahydrate: preliminary examination.
OBJECTIVE
To clarify magnetic resonance (MR) signal changes during hepatobiliary imaging after oral ingestion of manganese chloride tetrahydrate (Bothdel Oral Solution 10) (MCT).


METHODS
Subjects were an MCT phantom, 10 healthy volunteers and 155 consecutive patients. The phantom study evaluated the relationship between MCT concentration and MR signal intensity. The volunteer study qualitatively and quantitatively analyzed the time course of hepatobiliary imaging immediately and 30, 60, 120 and 180 min after oral ingestion of MCT. The clinical study analyzed the incidence and factors affecting signal changes on additional MRCP with MCT as a final scan during routine clinical MRCP.


RESULTS
In the phantom study, a significant and excellent positive linear correlation was found between MCT concentration and R2* measurement (r(2) = 0.996, p < 0.01). In the volunteer study, biliary imaging and hepatic R2* values changed significantly after oral ingestion of MCT (p < 0.05). In the clinical study, a signal drop on MRCP with MCT was visually confirmed in 14.8 % of cases. Multivariate logistic regression found no factors significantly affecting signal drop.


CONCLUSIONS
We recommend performing MRCP early after oral ingestion of MCT, because signal changes occur even during routine MRCP.
Department of Endoscopy and Ultrasound, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan, maru1225maru@yahoo.co.jp.
Nagaaki
N
Marugami
Megumi
M
Takewa
Yoshinori
Y
Iwaki
Yutaka
Y
Hazeyama
Kazumi
K
Iwato
Junko
J
Takahama
Aki
A
Marugami
Tomoyuki
T
Okuaki
Kimihiko
K
Kichikawa
D000284:Administration, Oral; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001660:Biliary Tract Diseases / Q000175:diagnosis*; D002712:Chlorides; D049448:Cholangiopancreatography, Magnetic Resonance / Q000379:methods*; D003287:Contrast Media; D005260:Female; D006801:Humans; D008297:Male; D017895:Manganese Compounds; D008875:Middle Aged; D010182:Pancreatic Diseases / Q000175:diagnosis; D019047:Phantoms, Imaging; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
D002712:Chlorides; D003287:Contrast Media; D017895:Manganese Compounds; C025340:manganese chloride