Correction method and correction device of magnetic resonance system

Abstract

The invention discloses a correction method of a magnetic resonance system. The magnetic resonance system comprises an RF transmitting module, a gradient module and an RF receiving module. The correction method comprises the steps of executing a first pulse sequence, acquiring a first set of echo signals and acquiring a frequency domain phase of the first set of echo signals, wherein the first pulse sequence is a spin echo sequence; executing a second pulse sequence, acquiring a second set of echo signals and acquiring the frequency domain phase of the second set of the echo signals, wherein the second pulse sequence is a non-selective layer spin echo sequence; acquiring a system relative time delay according to the frequency domain phases of the first set of echo signals and the second set of echo signals, wherein the system relative time delay comprises a relative time delay between the RF transmitting module and the gradient module and a relative time delay between the RF receiving module and the gradient module; and performing compensation on the magnetic resonance system according to the system relative time delay. According to the correction method and the correction device, the relative time delay of the magnetic resonance system can be accurately acquired through phase operation on the echo signal. Furthermore the invention provides a correction device of the magnetic resonance system.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of magnetic resonance imaging, in particular to a correction method and device for a magnetic resonance system. [0003] 【Background technique】 [0004] Magnetic Resonance Imaging (MRI) is a new type of medical imaging technology that mainly uses the nuclear magnetic resonance phenomenon of a certain nucleus in human tissue, and processes the radio frequency signal obtained by a computer to reconstruct an image of a certain level of the human body. Due to its non-ionizing radiation, multi-sequence, multi-parameter, multi-plane imaging and high soft tissue resolution, it is widely used in the diagnosis of diseases. MRI signal intensity is usually affected by various factors such as tissue proton density, T1 value, and T2 value. Imaging quality can be improved by adjusting imaging parameters such as radiofrequency pulse, gradient field, and signal acquisition time. Usually, the setting of relevant par...

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Problems solved by technology

However, the accuracy of the signal collected by this method is easily affected by unideal factors. For example, in the case of uneven B0 field, the results of the GRE sequence and SE sequence will be greatly affected; the sampling interval of the ADC when collecting data It is not infinitely small. By calculating the position of the maximum value, the accuracy can only be controlled at the level of the sampling interval, and the accuracy needs to be further improved.

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