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MAGNETIC RESONANCE IMAGING MAGNET QUENCH RELIEF VALVE

IP.com Disclosure Number: IPCOM000234908D
Publication Date: 2014-Feb-13
Document File: 5 page(s) / 152K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention provides a technique to seal a quench vent exit of a magnet-helium vessel by a re-useable quench vent relief valve design in a magnetic resonance imaging (MRI) system. The technique utilizes a magnetic force generated during normal operation of a MRI magnet to seal the vent exit of a magnet-helium vessel. Sealing of the vent exit inhibits escaping of helium from the vessel. When the magnet quenches, the magnetic force disappears and pressure inside the vessel generated by evaporated helium pushes the vent relief valve open. When the pressure has dropped to level included in the re-usable quench vent relief valve design, a restoring spring closes the valve to prevent moisture intake.

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MAGNETIC RESONANCE IMAGING MAGNET QUENCH RELIEF VALVE

FIELD OF INVENTION

The invention generally relates to a magnetic resonance imaging (MRI) system and more particularly to a re-usable quench vent relief valve to seal a quench vent exit in the MRI system.

BACKGROUND OF THE INVENTION

A magnetic resonance imaging (MRI) system utilizes a spring force close or burst disc valve to seal a quench vent exit for a helium-magnet vessel. The spring force valve causes backpressure inside magnet as they do not open completely. Required spring force can be very large depending on the magnet operating pressure and the vent exit area. In the case of a burst disc, there is repeated requirement to replace the disc..


A conventional technique includes a safety pressure relief device of a rupture disc type in a quench vent exit in MRI system. However, the relief device is required to be replaced after quenching. Furthermore, after a quench, helium vessel is no longer protected against air flow

Another conventional technique includes a pressure relief indicator. The pressure relief indicator includes a housing connected in fluid communication. However, the technique does not prevent backflow of air and leads to ice formation.

Another conventional technique include a monitor system for sensing failure of a rupture disc and activating alarm. However, the technique is not efficient to prevent air flowing into helium vessel.

Yet another conventional technique include a rupurable fluid flow indicator and a rupture disc assembly with indicator. However, the technique does not prevent backflow of air and leads to ice formation. Methods mentioned above provide only an indication of a quench. They do not provide a protection against air flow into helium vessel.

Hence there exists a need for an efficient technique to seal the quench vent exit, which prevents backflow of air and results in ice formation.

BRIEF DESCRIPTION OF THE INVENTION

The invention provides a technique to seal a quench vent exit of a magnet-helium vessel by a re-useable quench vent relief valve design in a magnetic resonance imaging (MRI) system.  The technique utilizes a magnetic force generated during normal operation of a MRI magnet to seal the vent exit of a magnet-helium vessel. Sealing of the vent exit inhibits escaping of helium from the vessel.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides a technique to seal a quench vent exit of a magnet-helium vessel by a re-useable quench vent relief valve design in a magnetic resonance imaging (MRI) system.  The technique utilizes a magnetic force generated during normal operation of a MRI magnet to seal the vent exit of a magnet-helium vessel. Sealing of the vent exit inhibits escaping of helium from the vessel. FIG. 1 depicts the re-usable quench vent relief valve design.

FIG.  1

When the magnet quenches the magnetic force disappears and pressure inside the vessel generated by evaporated helium pushes the vent relief valve open. FIG. 2...