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CONDUCTED COOLING OF SUPERCONDUCTING MRI MAGNET

IP.com Disclosure Number: IPCOM000198208D
Publication Date: 2010-Jul-30
Document File: 5 page(s) / 72K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention provides a conducted cooling method that insulates the heat produced by the switch of the superconducting MRI magnet. The conducted cooling method keeps thermal input to the magnet low and provides a reasonable ramping voltage.

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CONDUCTED COOLING OF SUPERCONDUCTING MRI MAGNET

FIELD OF INVENTION

The invention generally relates to cooling techniques to reduce the temperature of the superconductor magnet of MRI and more particularly to conducted cooling of a switch of the superconductor for low thermal input to the MRI magnet and reasonable ramping voltage.

BACKGROUND OF THE INVENTION

Generally, a superconductor magnet of an MRI is cooled down to a temperature of 4.2 K. Conventionally, the temperature of the superconductor is reduced using a cryostat. A typical superconducting magnet cryostat includes a liquid helium vessel, one or two thermal shields and a vacuum vessel. Usually, the superconductor is built as a solenoid or a coil. The cooling of the superconducting coil is performed by immersing the superconductor in a liquid helium vessel.

Another conventional method of cooling the coils of superconductor magnet includes circulating liquid helium through a cooling tube forcefully or naturally. A cooling tube is connected with the coil. FIG. 1 illustrates magnetic coils and gradient coils structure of a conventional cooling method. The lower temperature helium comes from helium reservoir and enters into the cooling tube to cool the superconducting coil. The higher temperature helium moves back to the helium reservoir. The higher temperature helium in the reservoir is cooled using a heat exchanger.

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FIG. 1

However, during magnet ramping up/down, the temperature of switch cannot be very high because very less heat is permitted to be input to the magnet. As a result of limitation of heat to be input to the magnet, the ramping voltage is very limited. Therefore, the time taken to ramp magnets is very long such as about 4 hours.

Hence there exists a need to develop a cooling technique that keeps the thermal input to the magnets low.

BRIEF DESCRIPTION OF THE INVENTION

A conducted cooling method to insulate the heat produced by a switch - of a superconducting MRI magnet is disclosed. The conducted cooling method keeps thermal input to magnets low and enables a reasonable ramping voltage.

DETAILED DESCRIPTION OF THE INVENTION

A conducted cooling method to insulate the heat produced by a switch of a superconducting MRI magnet is disclosed. The conducted cooling method includes at least two cooling pipelines. Of the two cooling pipelines, a first cooling pipeline (a first

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pipeline) is for cooling the switch and a second cooling pipeline (second pipeline) is used during the ramping of a magnet to transfer the heat produced by the switch. The second cooling pipeline transfers the heat away from the magnet.

FIG. 2 illustrates the con...