Transmitter, receiver, magnetic resonance device and radio-frequency signal generation method
A radio frequency signal and transmitter technology, applied in magnetic resonance measurement, measurement of magnetic variables, measurement devices, etc., can solve the problem of frequent frequency switching of transmitters
Active Publication Date: 2018-12-14
SHANGHAI NEUSOFT MEDICAL TECH LTD
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[0003] In order to compensate the magnetic field (B0 magnetic field) caused by the eddy current of the gradient coil in the X, Y, and Z directions to the main magnetic field after offsetting the mean field, the system needs to frequently weight the compensation factor of the gradient coil eddy current to the frequency of the main magnetic field, so it will Causes the frequency of the transmitter to switch frequently
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[0039] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.
[0040] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term...
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The invention provides a transmitter, a receiver, a magnetic resonance device and a radio-frequency signal generation method. A frequency control word generation unit generates a frequency control word; a frequency control word transmitting unit transmits the frequency control word to a frequency control word receiving unit in the receiver; a synchronous triggering unit is used for generating a synchronous signal and transmitting the synchronous signal to a synchronous sensing unit in the receiver, so that a DDC unit in the receiver generates a digital radio-frequency signal according to the frequency control word under the triggering of the synchronous signal; a DDS unit generates a digital radio-frequency signal according to the frequency control word under the triggering of the synchronous signal; a DAC unit converts the digital radio-frequency signal into an analog radio-frequency signal; and the DAC unit receives the digital radio-frequency signal at a first moment, the synchronous sensing unit receives the synchronous signal at a second moment, and the DDC unit receives the frequency control word at a third moment, wherein the first moment is the same as the second moment andis later than the third moment. The phases of the transmitter and the receiver can be ensured to be coherent.
Description
technical field [0001] The present application relates to the technical field of medical equipment, in particular to a transmitter, a receiver, a magnetic resonance equipment and a method for generating a radio frequency signal. Background technique [0002] Magnetic Resonance Imaging (MRI) is one of the main imaging methods in modern medical imaging. The basic working principle of magnetic resonance imaging is to use the magnetic resonance phenomenon, use radio frequency signals to excite hydrogen protons in the subject, and use gradient fields for position encoding, and then receive magnetic resonance signals with position information, and finally use Fourier transform Reconstruct the magnetic resonance image. [0003] In order to compensate the magnetic field (B0 magnetic field) caused by the eddy current of the gradient coil in the X, Y, and Z directions to the main magnetic field after offsetting the mean field, the system needs to frequently weight the compensation fa...
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IPC IPC(8): G01R33/36
CPCG01R33/3607G01R33/3621
Inventor 史建华
Owner SHANGHAI NEUSOFT MEDICAL TECH LTD