Superconducting quantum interference device (SQUID) cooling device of handheld ultra low field magnetic resonance imaging (MRI)

Abstract

The invention relates to a superconducting quantum interference device (SQUID) cooling device of handheld ultra low field magnetic resonance imaging (MRI). The SQUID cooling device comprises a cooling head and a cooling conduit, wherein the cooling head is connected with an external cooling device through the cooling conduit. Ultra low temperature suitable for the operation of an SQUID is acquired through a cold supply device and transmitted to the SQUID through the cooling conduit and the cooling head so as to provide an ultra low temperature working environment for the SQUID; because only the cooling head and partial cooling conduit need to be encapsulated, liquid helium and liquid nitrogen are not needed; because only the cooling head and the cooling conduit need to be encapsulated, the cooling device has simple and practical structure, and saves the operation and maintenance costs; and the device is suitable to be used as the cooling device for the SQUID of the handheld ultra low field MRI. A cooling capsule is arranged, and one of the cooling capsule and an external refrigerating device can be selectively used; under the condition that the external refrigerating device is started, the used cooling capsule can be inserted into the installation cavity of the cooling capsule; and through the external refrigerating device, the coolant in the cooling capsule is newly liquefied, so that the cooling capsule can be recycled.

Description

technical field [0001] The invention relates to a cooling device, in particular to a SQUID cooling device for a hand-held ultra-low field MRI. Background technique [0002] Existing MRI (Magnetic Resonance Imaging, magnetic resonance imaging), its hardware equipment mainly includes computer, magnet (or polarizing coil), gradient coil, excitation coil, magnetic flux probe, receiving coil, data acquisition module, main control module, power Control module and interface module. Among them, the excitation coil is placed close to the measured object to generate excitation signals to different parts of the tested object; the magnet (or polarized coil) and the gradient coil are evenly arranged around the measured object to generate regular Magnetic field; the power control module is electrically connected to the data acquisition module, the main control module and the magnetic flux probe; the receiving coil is used to receive the magnetic resonance signal of the object under test,...

AI Technical Summary

Problems solved by technology

[0006] SQUID (Superconducting Quantum Interference Device, Superconducting Quantum Interference Device) is currently the most sensitive magnetic flux detector in the world. It is very small and suitable for making a hand-held ultra-low field MRI system. Refrigerant refrigeration cools the SQUID, and its cooling structure is relatively large and cannot be packaged with the SQUID. This is an important reason why it is currently impossible to use SQUID to make handheld ultra-low field MRI. Therefore, there is no use of SQUID as a The core components are made into a handheld ultra-low field MRI system

Moreover, a large amount of liquid helium or liquid nitrogen is used to cool SQUID for a long time. This type of refrigerant is a non-renewable scarce resource and is expensive.

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