High-resolution blood flow velocity measurements in the human finger.
MR phase contrast blood flow velocity measurements in the human index finger were performed with triggered, nontriggered, and cine acquisition schemes. A strong (G(max) = 200 mT/m), small bore (inner diameter 12 cm) gradient system inserted in a whole body 3 Tesla MR scanner allowed high-resolution imaging at short echo times, which decreases partial volume effects and flow artifacts. Arterial blood flow velocities ranging from 4.9-19 cm/sec were measured, while venous blood flow was significantly slower at 1.5-7.1 cm/sec. Taking into account the corresponding vessel diameters ranging from 800 microm to 1.8 mm, blood flow rates of 3.0-26 ml/min in arteries and 1.2-4.8 ml/min in veins are obtained. The results were compared to ultrasound measurements, resulting in comparable blood flow velocities in the same subjects. Magn Reson Med 45:716-719, 2001.
Arbeitsgruppe NMR, Institut für Medizinische Physik, Universität Wien, Vienna, Austria.
M
M
Klarhöfer
B
B
Csapo
C
C
Balassy
J C
JC
Szeles
E
E
Moser
D001783:Blood Flow Velocity / Q000502:physiology*; D005385:Fingers / Q000098:blood supply*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D014463:Ultrasonography