Surgery – Truss – Pad
Patent
1995-09-27
1997-03-11
Lateef, Marvin M.
Surgery
Truss
Pad
1286533, 1286534, 324309, A61B 5055
Patent
active
056091532
ABSTRACT:
A magnetic resonance (MR) active invasive device system employs a small, high-field polarizing magnet having a toroidal geometry, and a large low-field magnetic resonance (MR) imaging magnet for the purpose of generating MR angiograms of selected blood vessels. A subject is positioned in a large low-field MR imaging magnet. A catheter is inserted into the patient at or near the root of a vessel tree to be imaged. A fluid, intended to be used as a contrast agent is first passed through the small high-field polarizing magnet, causing a great deal of net longitudinal magnetization to be produced in the fluid. The fluid is then introduced into the subject through the catheter. Radiofrequency (RF) pulses and magnetic field gradients are then applied to the patient as in conventional MR imaging. Since the fluid has a larger longitudinal magnetization, before the MR imaging sequence, the fluid produces a much larger MR response signal than other tissue, resulting in the vessel tree being imaged with excellent contrast.
REFERENCES:
patent: 5447156 (1995-09-01), Dumoulin et al.
patent: 5479925 (1996-01-01), Dumoulin et al.
Darrow Robert D.
Dumoulin Charles L.
General Electric Company
Lateef Marvin M.
Shaw Shawna J.
Snyder Marvin
Zale Lawrence P.
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