Apparatus and methods for magnetic resonance (MR) imaging of cav

Details Apparatus and methods for magnetic resonance (MR) imaging of cav Apparatus and methods for magnetic resonance (MR) imaging of cav

1995-10-02

1997-04-08

Lateef, Marvin M.

Surgery

Truss

Pad

1286534, 1286533, 324309, A61B 5055

Patent

active

056178590

ABSTRACT:
A magnetic resonance (MR) active invasive device system employs a small, high-field polarizing magnet, and a large magnetic resonance (MR) imaging magnet for the purpose of generating MR images of selected body cavities. A subject is positioned in a large low-field MR imaging magnet. A substance, intended to be used as a contrast agent is first cooled, and then passed through the small high-field polarizing magnet where it becomes highly polarized. The substance is then heated to physiologic temperatures, vaporized, and introduced into the subject through a transfer conduit as a vapor. Radiofrequency (RF) pulses and magnetic field gradients are then applied to the patient as in conventional MR imaging. Since the vapor is highly polarized, it can be imaged even though it has a much lower density than the surrounding tissue.

REFERENCES:
patent: 5357959 (1994-10-01), Fishman
patent: 5479925 (1996-01-01), Dumoulin et al.
"MRI Using Hyperpolarized Gas" By G.A. Johnson, R.D. Black, G. Cates, G. Cofer, R. Gunther, W. Happer, L.W. Hedlund, H. Middleton & J. Swartz, Proceedings of the Society of Magnetic Resonance and the European Society for Magnetic Resonance in Medicine and Biology, Nice, France, Aug. 19-25, 1995, vol. 1 pp. 392.

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