Apparatus and methods for magnetic resonance (MR) imaging of cavities using fluids polarized at low temperatures
Patent 5617859 Issued on April 8, 1997. Estimated Expiration Date: 
October 2, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 2, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAltered dipole moment magnetic resonance imaging method Magnetic resonance (MR) angiography in a low-field imaging magnet Patent #: 5479925 InventorsApplicationNo. 537574 filed on 10/02/1995US Classes:600/420, Using detectable material placed in body324/309, To obtain localized resonance within a sample600/422CoilExaminersPrimary: Lateef, Marvin M.Assistant: Shaw, Shawna J. Attorney, Agent or FirmInternational ClassA61B 005/055AbstractA 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.Other References
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