IP Library › Granted Patent US 10,408,899
Granted Patent B2
US 10,408,899 · App. 15/366,451 · Granted Sep 10, 2019

Magnetic resonance imaging apparatus and gradient magnetic field power supply device

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Quick Facts
Patent No.
US 10,408,899
App. No.
15/366,451
Granted
Sep 10, 2019
Kind
B2
Abstract

A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.

Claims (29)

1. A magnetic resonance imaging apparatus, comprising:

a gradient magnetic field coil configured to apply gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels; and

a gradient magnetic field power supply configured to calculate a required power for each channel, and distribute maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole, wherein

the gradient magnetic field power supply includes:

an AC/DC conversion circuit configured to convert an AC voltage to a DC voltage;

DC transformation circuits configured to transform the DC voltage, the DC transformation circuits corresponding to the channels; and

a control circuit configured to distribute the maximum power to the channel requiring higher power than the required power of the other channels with priority to the other channels based on the required power of each of the channels.

2. The apparatus according to claim 1 , wherein

the control circuit is further configured to calculate the required power based on a voltage of a capacitor included in the DC transformation circuits.

3. The apparatus according to claim 1 , wherein

the control circuit is further configured to calculate the required power based on information of a pulse sequence for imaging the object.

4. The apparatus according to claim 1 , wherein

the control circuit is further configured to distribute the maximum power to the channel requiring higher power than the required power of the other channels with priority to the other channels when a total sum of the required power exceeds a predetermined threshold value.

5. A magnetic resonance imaging apparatus, comprising:

a gradient magnetic field coil configured to apply gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels; and

a gradient magnetic field power supply configured to calculate a required power for each channel, and distribute maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole, wherein

the gradient magnetic field coil includes a main coil configured to form the gradient magnetic field, and a shield coil configured to cancel and/or minimize effect of eddy current.

6. A gradient magnetic field power supply device comprising:

a control circuit configured to:

calculate a required power for each of a plurality of channels included in a gradient magnetic field coil of a magnetic resonance imaging apparatus; and

distribute maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole, the gradient magnetic field power supply device further comprising:

an AC/DC conversion circuit configured to convert an AC voltage to a DC voltage; and

DC transformation circuits configured to transform the DC voltage, the DC transformation circuits corresponding to the channels.

7. The device according to claim 6 , wherein

the control circuit is further configured to calculate the required power based on a voltage of a capacitor included in the DC transformation circuits.

8. The device according to claim 6 , wherein

the control circuit is further configured to calculate the required power based on information of a pulse sequence for imaging an object by the magnetic resonance imaging apparatus.

9. The device according to claim 6 , wherein

the control circuit is further configured to distribute the maximum power to the channel requiring higher power than the required power of the other channels with priority to the other channels when a total sum of the required power exceeds a predetermined threshold value.