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Coil driving method and apparatus and magnetic resonance imaging device

A coil drive and coil technology, applied in magnetic resonance measurement, measurement of magnetic variables, medical science, etc., can solve the problems of sensitivity fluctuation, unbalance, coupling unbalance, etc.

Inactive Publication Date: 2007-05-02
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, when a sample with a smaller body structure is used, such as shown in FIG. The electromagnetic coupling with the sample and the coupling between the lower coil 5B and the sample are in an unbalanced state
Therefore, a uniform power supply from the divider 22 to all the coils 51A, 52A, 51B, and 52B creates an imbalance between the magnetic field formed by the upper coil 5A and the magnetic field formed by the lower coil 5B, thereby causing such problem, that a shift in sensitivity occurs

Method used

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  • Coil driving method and apparatus and magnetic resonance imaging device
  • Coil driving method and apparatus and magnetic resonance imaging device
  • Coil driving method and apparatus and magnetic resonance imaging device

Examples

Experimental program
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no. 1 example

[0105] FIG. 1 is a block diagram showing a configuration of an MRI apparatus according to a first embodiment of the present invention.

[0106] In the present MRI apparatus 1, the magnet assembly 2 has a space (hole) for inserting a sample thereinto. Static magnetic field coil 3 used to apply a constant static magnetic field to the sample, gradient or ramped magnetic field coil 4 used to generate gradient or ramped magnetic fields on the slice axis, guide axis and phase axis, used to provide RF pulses to excite nuclei in the sample The spinning transmitting coil 5 and the receiving coil 6 used to detect the NMR signal from the sample are arranged in the magnet assembly 2 to surround the above-mentioned space.

[0107] The static magnetic field coil 3 is electrically connected to a static magnetic field source 7 . The gradient magnetic field coil 4 is electrically connected to a gradient or ramp magnetic field drive circuit or driver 8 . The transmitting coil 5 is electricall...

no. 2 example

[0125] FIG. 3 is a schematic diagram showing a transmission coil drive circuit 9-2 and a transmission coil 5 according to the second embodiment. Incidentally, the same structural elements as those used in the first embodiment are denoted by the same numerals, respectively, so that their descriptions can be simplified.

[0126] The transmitting coil driving circuit 9-2 includes an amplifier 21, a divider 22, an attenuator 23, corresponding sensing coils P1A, P2A, P1B and P2B placed near the four coils constituting the transmitting coil 5, and a comparator controller 25- 2. It is used to sample and compare the voltage induced by the corresponding sensing coils P1A, P2A, P1B and P2B at the timing corresponding to the control signal Cs sent by the computer 12, and adjust the attenuation rate of the attenuator 23 to make the voltage according to The predetermined ratio is changed accordingly, and the output of the amplifier 21 is controlled according to each decay rate.

[0127] T...

no. 3 example

[0133] FIG. 4 is a schematic diagram showing a transmission coil drive circuit 4-3 and a transmission coil 5 according to the third embodiment. Incidentally, the same structural elements as those used in the first embodiment are denoted by the same numerals, respectively, so that their descriptions can be simplified.

[0134] The transmitting coil drive circuit 9-3 includes an amplifier 21, a divider 22, and a setting controller 26 for adjusting the respective attenuation rates of the attenuator 23 so that each attenuation rate becomes set by the control signal Cs sent from the computer 12. value, and the output of the amplifier 21 is controlled according to the attenuation rate.

[0135] The transmitting coil 5 includes an upper coil 5A and a lower coil 5B, which are vertically opposed to each other.

[0136] The upper coil 5A includes an upper first coil 51A and an upper second coil 52A.

[0137] The lower coil 5B includes a lower first coil 51B and a lower second coil 52B...

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Abstract

With the objective of preventing variations in sensitivity even if samples to be inserted between an upper coil and a lower coil opposite to each other are different in body frame, a pre-scan is effected on a sample in a state in which the sample is placed in a space defined between the upper coil and the lower coil, and reflected waves sent from the coils are detected by a directional coupler. Further, a comparison controller controls an attenuator so that the voltages of the reflected waves are equalized. Afterwards, a main scan is carried out.

Description

technical field [0001] The present invention relates to a coil driving method, a coil driving device and an MRI (Magnetic Resonance Imaging) device, and more particularly, to a coil driving method, a coil driving device and an MRI device capable of being inserted into two Samples between a coil on one side and a coil on the other side prevent variations in sensitivity even when the body skeleton differs. Background technique [0002] FIG. 5 is an explanatory view showing an example of a transmitting coil drive circuit and a transmitting coil used in an MRI apparatus related to the present invention. [0003] The transmitting coil driving circuit 9-J has an amplifier 21 for amplifying the power of the driving pulse Dp, and a divider for dividing the output of the amplifier 21 into four to be sent to the four coils constituting the transmitting coil 5 . [0004] The transmitting coil 5 includes an upper coil 5A and a lower coil 5B facing each other in the vertical direction. ...

Claims

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Application Information

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IPC IPC(8): A61B5/055G01R33/36
CPCG01R33/3628A61B5/055
Inventor 佐藤健志
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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