Surgery – Truss – Pad
Patent
1995-10-02
1997-05-06
Lateef, Marvin M
Surgery
Truss
Pad
1286533, A61B 5055
Patent
active
056261373
ABSTRACT:
A magnetic resonance (MR) active invasive device system employs a small, high-field polarizing magnet, and a large, possibly 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 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 cooled and frozen, and then passed through the small high-field polarizing magnet where it becomes highly polarized. The frozen fluid is then heated and melted to physiologic temperatures and 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 than tissue which has not passed through the polarizing magnet, the fluid produces a much larger MR response signal than other tissue, resulting in vessel tree images with excellent contrast.
REFERENCES:
patent: 4642206 (1987-02-01), Honig
patent: 5479925 (1996-01-01), Dumoulin et al.
patent: 5545396 (1996-08-01), Albert et al.
Darrow Robert D.
Dumoulin Charles L.
Souza Steven P.
General Electric Company
Lateef Marvin M
Shaw Shawna J.
Snyder Marvin
Zale Lawrence P.
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