Magnetic resonance imaging coil structure and imaging device thereof
A magnetic resonance imaging and coil technology, which is applied in magnetic resonance measurement, measurement device, material analysis through resonance, etc., can solve problems such as difficulty in reducing current tolerance, increasing frequency shift, affecting tomographic image quality, etc.
Inactive Publication Date: 2005-09-28
GE MEDICAL SYST GLOBAL TECH CO LLC
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Problems solved by technology
Because this distance error can cause an increase in frequency shift and seriously affect the image quality of the resulting tomographic image, it must be precisely controlled
Although the distance between the shield and the transmit coil is typically 20 mm, a tolerance of about 1 mm can actually occur in the assembly process described above, and a 1 mm tolerance causes a frequency shift of about 100 kHz
[0007] For this reason, a tighter tolerance on the distance between the shield and the transmitting coil is preferable; however, between the shield and the coil, insertion / removal is necessary for replacement in a trial-and-error process for the correction field to adjust for the field produced by the main field. Multiple replaceable backing plates for the spatial uniformity of the main magnetic field generated by the magnets, tolerances in the thickness of the backing plates themselves affect the distance between the shield and the transmitting coil, thus making it difficult to reduce the current tolerance
Method used
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[0039] Embodiments of a magnetic resonance imaging coil structure according to the present invention and a magnetic resonance imaging (MRI) apparatus of the present invention to which the coil structure is applied will now be described in detail with reference to the accompanying drawings. But the invention
[0040] It is not limited to these examples.
[0041] attached figure 1 One embodiment of the magnetic resonance imaging coil structure 10 of the present invention is shown, with figure 2 shown in the attached figure 1 The external view of the vertical magnetic field type MRI apparatus 100 of the magnetic resonance imaging coil structure 10 shown in , which is an embodiment of the present invention. for giving figure 2 The illustrated MRI apparatus 100 generates a magnetic field, and a pair of magnetic resonance imaging coil structures 10 and 10 ′ of this embodiment are disposed on a space 60 where an object 50 is placed, the pair of coils facing each other from uppe...
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For the purpose of providing a magnetic resonance imaging coil structure in which the tolerance of the distance between a shield and a transmission coil can be reduced to reduce the amount of frequency shift, in a magnetic resonance imaging coil structure 10 comprising a main magnetic field generating magnet 11, a gradient magnetic field generating coil 12, a shield 13, a magnetic field correcting shim plate 14 (14a, 14b, 14c, . . . ), a transmission coil 16 and a cover 17 stacked, the shield 13 and the transmission coil 16 are integrally formed with a joint portion 15 made of FRP that maintains a constant distance between the shield 13 and transmission coil 16.
Description
technical field [0001] The present invention relates to a magnetic resonance imaging coil structure and a magnetic resonance imaging device using the coil structure, in particular, it relates to a main magnetic field generating magnet, a gradient magnetic field generating coil, a shield, a magnetic field correction pad and a transmitting A magnetic resonance imaging coil structure of a coil and a magnetic resonance imaging device using the coil structure. Background technique [0002] In recent years, a magnetic resonance imaging apparatus (MRI apparatus) has attracted attention because it can provide tomographic images of an object such as a human body. In the MRI apparatus, the magnetic properties of the hydrogen nuclei (protons) used in the object are required, and therefore it is necessary to form a strong uniform and stable magnetic field. [0003] Therefore, a conventional MRI apparatus uses a superconducting magnet to generate a main magnetic field; however, in the p...
Claims
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IPC IPC(8): G01R33/422A61B5/055G01R33/34G01R33/381
CPCG01R33/381G01R33/3873G01R33/422G01R33/34007G01R33/3806G01R33/34061
Inventor 佐藤健志
Owner GE MEDICAL SYST GLOBAL TECH CO LLC