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Compensation of magnetic field components caused by a periodic motion of a cold head

A cold head and motion technology, applied in the direction of measuring devices, measuring magnetic variables, instruments, etc., can solve the problems that the main magnet cannot be actively cooled and the temperature of the refrigerant rises, so as to improve the image quality, reduce the pressure increase, and reduce the number of parts used. Effect

Pending Publication Date: 2019-08-27
KONINKLJIJKE PHILIPS NV
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Problems solved by technology

Therefore, the main magnet cannot be actively cooled during the acquisition of those MR imaging signals, which leads to an increase in the temperature of the cryogen

Method used

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  • Compensation of magnetic field components caused by a periodic motion of a cold head
  • Compensation of magnetic field components caused by a periodic motion of a cold head
  • Compensation of magnetic field components caused by a periodic motion of a cold head

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Embodiment Construction

[0075] figure 1 A schematic illustration of part of an embodiment of a magnetic resonance (MR) imaging system 110 comprising an MR scanner 112 according to a first preferred embodiment is shown. The MR imaging system 110 is generally described here as the basis for all discussed embodiments.

[0076] The MR imaging system 110 includes a main magnet 114 provided for generating a static magnetic field. The main magnet 114 has a central bore that provides an examination space 116 about a central axis 118 for an object of interest 120 , typically a patient to be positioned therein. In this embodiment, the central bore and thus, the static magnetic field of the main magnet 114 has a horizontal orientation according to the central axis 118 . In alternative embodiments, the orientation of the main magnet 114 may be different, for example, to provide a static magnetic field with a perpendicular orientation. Additionally, the MR imaging system 110 includes a magnetic gradient coil s...

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Abstract

The present invention provides a method for compensation of periodic B0 modulations from a periodic motion of a cold head (212) of a main magnet (114) of a magnetic resonance (MR) imaging system (110), whereby main windings (200) of the main magnet (114) are cooled to superconductivity by the cold head (212), which exerts a repetitive motion, the method comprising the steps of measuring a periodicoccurrence of spatial field components of the B-field based on a motion of the cold head (212) as a function of time, performing a sensor measurement of a periodic, auxiliary parameter of the MR imaging system (110), which is not the periodic occurrence of spatial field components, synchronizing the periodic occurrence of spatial field components of the B-field with the measured periodic, auxiliary parameter of the MR imaging system (110), and triggering based on the measured periodic sensor measurement of the MR imaging system (110) a periodic application of compensation signals to compensate the periodic occurrence of spatial field components of the B-field based on a motion of the cold head (212). Furthermore, the present invention provides a MR imaging system (110) for providing an image representation of a region of interest (142) of a subject of interest (120) positioned in an examination space (116) of the MR imaging system (110), wherein the MR imaging system (110) is adaptedto perform the above method.

Description

technical field [0001] The present invention relates to the field of magnetic resonance (MR) examination systems, in particular to the field of superconducting magnets used in MR examination systems, and more particularly to the compensation of periodic B 0 The field of modulation, where the main winding of the main magnet is cooled to superconductivity by a cold head, which applies a repetitive motion. More specifically, the present invention relates to the field of MR imaging systems for providing an image representation of a region of interest of an object of interest positioned in an examination space of the MR imaging system. Background technique [0002] A magnetic resonance (MR) examination system includes a main magnet having a cryogenic vessel in which a main magnet coil of the main magnet is mounted, the main magnet being a superconducting magnet. Cryogenic vessels typically consist of two or three separate vessels and mounting structures. In a typical design for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/3815G01R33/389G01R33/3875
CPCG01R33/3804G01R33/3815G01R33/3875G01R33/389G01R33/56563
Inventor C·L·G·哈姆F·范利埃
Owner KONINKLJIJKE PHILIPS NV
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