Oral manganese for liver imaging at three different field strengths.
OBJECTIVE
To study the magnetic resonance imaging signal intensity of the liver and gall bladder before and after ingestion of a new oral manganese containing contrast medium at three different field strengths.


METHODS
Twelve healthy male volunteers (mean age, 24.9 years; range, 20-39 years) underwent abdominal magnetic resonance imaging (T(2)W COR, T(1)W COR, T(1)W TRA) at 0.23 T, 0.6 T, and 1.5 T before and after the contrast administration. The duration of fasting was identical before the two studies. Volunteers were randomized into two equal groups (n = 6) to ingest either half or full strength CMC-001 providing either 0.8 or 1.6.g MnCl(2) plus absorption promoters. The CMC-001 dose was dissolved in 400 mL water and ingested 2.5 hours before imaging. The resulting images were evaluated with regard to visualization of the liver and the gall bladder by three radiologists. The signal intensity of the liver was also measured. Blood and urine samples were collected before and after ingestion of CMC-001.


RESULTS
The intake of CMC-001 caused a significant increase in the signal intensity of the liver at all three field strengths and at both dosages (up to 90%) on the T(1)W images. The internal structure of the liver was significantly better delineated. The bile in gall bladder was bright after ingestion of the low dose, but dark after the full dose. On the T(2)W images, CMC-001 lowered the signal intensity of liver with up to 30%. CMC-001 had a slight metallic taste, but of no importance according to the volunteers. No systematic adverse reactions caused by the contrast medium were registered. No changes in the blood levels of various routine parameters were measured.


CONCLUSIONS
It is possible to increase the signal intensity of the liver significantly by oral intake of essential nutritional elements including manganese. The imaging window is more than 2 hours.
Thomsen
Henrik S
HS
Department of Diagnostic Radiology 54E2, Copenhagen University Hospital at Herlev, Herlev Ringvej 75, DK-2730 Herlev, Denmark. heth@herlevshosp.kbhamt.dk
Loegager
Vibeke
V
Noergaard
Henrik
H
Chabanova
Elizaveta
E
Moller
Jakob M
JM
Sonne
Jesper
J
D000284:Administration, Oral; D000328:Adult; D003287:Contrast Media / Q000008:administration & dosage*; D005704:Gallbladder / Q000033:anatomy & histology; D006801:Humans; D008099:Liver / Q000033:anatomy & histology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008345:Manganese / Q000008:administration & dosage*
D003287:Contrast Media; D008345:Manganese