Surgery – Truss – Pad
Patent
1994-06-23
1995-08-29
Smith, Ruth S.
Surgery
Truss
Pad
324306, A61B 5055
Patent
active
054451515
ABSTRACT:
A method of magnetic resonance (MR) fluid flow measurement within a subject employs an invasive device with an RF transmit/receive coil and an RF transmit coil spaced a known distance apart. The subject is positioned in a static magnetic field. The invasive device is positioned in a vessel of a subject in which fluid flow is desired to be determined. A regular pattern of RF transmission pulses are radiated through the RF transmit/receive coil causing it to cause a steady-state MR response signal. Intermittently a second RF signal is transmitted from the RF coil positioned upstream which causes a change in the steady-state MR response signal sensed by the downstream transmit/receive coil. This is detected a short delay time later at the RF receive coil. The time delay and the distance between the RF coils leads directly to a fluid velocity. By exchanging the position of the RF transmit and transmit/receive coils, retrograde velocity may be measured. In another embodiment, more RF coils are employed. The changed MR response signal may be sensed at a number of locations at different times, leading to a measured change in velocity, or acceleration of the fluid.
REFERENCES:
patent: 3191119 (1965-06-01), Singer
patent: 4782295 (1988-11-01), Lew
Darrow Robert D.
Dumoulin Charles L.
General Electric Company
Smith Ruth S.
Snyder Marvin
Zale Lawrence P.
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