Gradient magnetic field power supply device and gradient magnetic field power supply control method

Abstract

To improve the slew rate while suppressing a decrease in image quality. [Solution] The gradient magnetic field power supply device according to the embodiment is characterized by comprising a first circuit, a first detection unit, a second detection unit, and a second circuit. The first circuit supplies current to the first coil based on a first signal corresponding to the current to be supplied to the first coil that generates a gradient magnetic field. The first detection unit detects the current flowing through the first coil. The second detection unit detects the current flowing through the second coil that generates a gradient magnetic field. The second circuit supplies current to the second coil based on a second signal which is based on a signal corresponding to the difference between the current detected by the first detection unit and the current detected by the second detection unit, and the first signal.

Claims

1. A first circuit that supplies current to a first coil that generates a gradient magnetic field, based on a first signal corresponding to the current to be supplied to the first coil, A first detection unit for detecting the current flowing through the first coil, A second detection unit that detects the current flowing through a second coil that generates a gradient magnetic field, A second circuit supplies current to the second coil based on a second signal derived from a signal corresponding to the difference between the current detected by the first detection unit and the current detected by the second detection unit, and the first signal. A gradient magnetic field power supply device characterized by comprising the following features.

2. The second signal is characterized by being a signal obtained by combining the signal corresponding to the difference and the first signal. The gradient magnetic field power supply device according to claim 1.

3. The first circuit is characterized by supplying a current to the first coil such that the difference between the first signal and the signal corresponding to the current detected by the first detection unit becomes small. The gradient magnetic field power supply device according to claim 1.

4. The second circuit is characterized by supplying a current to the second coil such that the difference between the second signal and the signal corresponding to the current detected by the second detection unit becomes small. The gradient magnetic field power supply device according to claim 1.

5. The second circuit is characterized by supplying current to the second coil in accordance with the product of the difference and the gain. The gradient magnetic field power supply device according to claim 1.

6. The present invention further comprises a timing adjustment circuit that adjusts the timing of supplying the first signal to the second circuit, The gradient magnetic field power supply device according to claim 1.

7. The timing adjustment circuit is characterized by delaying the timing at which the first signal is supplied to the second circuit. The gradient magnetic field power supply device according to claim 6.

8. The timing adjustment circuit is characterized by speeding up the timing at which the first signal is input to the second circuit. The gradient magnetic field power supply device according to claim 6.

9. The timing adjustment circuit is characterized by inputting the first signal to the second circuit earlier than the output timing determined by the imaging sequence for imaging the subject. The gradient magnetic field power supply device according to claim 8.

10. The second circuit is characterized by supplying current to the second coil according to the difference, the integral of the difference, and the derivative of the difference. A gradient magnetic field power supply device according to claim 1 or 6.

11. The second circuit is characterized by generating the second signal in response to the inverted first signal. The gradient magnetic field power supply device according to claim 1.

12. The first coil and the second coil are characterized by generating a gradient magnetic field in one of three intersecting axial directions. The gradient magnetic field power supply device according to claim 1.

13. Based on a first signal corresponding to the current to be supplied to the first coil that generates a gradient magnetic field, a current is supplied to the first coil. The current flowing through the first coil is detected, The current flowing through the second coil that generates the gradient magnetic field is detected, A signal corresponding to the difference between the detected current flowing through the first coil and the detected current flowing through the second coil, and a second signal based on the first signal, are used to supply current to the second coil. A method for controlling a gradient magnetic field power supply, characterized by including the following:

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