[Measurement of portal blood flow with magnetic resonance imaging].
A new method for measuring portal blood flow using magnetic resonance imaging has been developed. Flow velocities are calculated from distances that are directly visualized using a new pulse sequence. In a phantom study, the measured flow rates showed a close correlation (r = 0.9996) with actual flow rates in the range 4.7 cm/sec to 22.8 cm/sec. In a study using volunteers, portal blood flow was quickly measured (about 18 seconds) using electrocardiographic gating. These measurements were compared with those obtained by Doppler ultrasound, with which they showed a close correlation in flow velocity (r = 0.968) and flow volume (r = 0.936). This method allows reasonably accurate quantitative analysis of portal blood flow in patients in whom the Doppler method can not be used because of obesity or intestinal gas.
Tamada
T
T
Moriyasu
F
F
Ono
S
S
Kajimura
K
K
Soh
Y
Y
Kawasaki
T
T
Kimura
T
T
Yamashita
Y
Y
Someda
H
H
Uchino
H
H
D000328:Adult; D001783:Blood Flow Velocity; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008961:Models, Structural; D011169:Portal Vein / Q000502:physiology*; D011237:Predictive Value of Tests; D012039:Regional Blood Flow; D014463:Ultrasonography