Magnetic resonance data collection method and magnetic resonance imaging system

Abstract

The invention relates to a magnetic resonance data collection method and a magnetic resonance imaging system. The method comprises the steps that electrocardio-signals are acquired in real time, whether a heart stays in a heartbeat contraction period or a heartbeat relaxation period is judged, and a judgment result is transmitted to a magnetic resonance scanning sequence; and the magnetic resonance scanning sequence executes a corresponding collection method according to the judgment result. According to the invention, a cardiac impulse state is judged in time, and strong high-order flow effects are avoided according to the cardiac impulse state when a phase encoding step of k space is collected, so that influences of the high-order flow effects can be reduced to the hilt. In addition, the total quantity of phase encoding steps is unchanged, so that use of the magnetic resonance data collection method provided by the invention will not change the total duration for sequence magnetic resonance data collection. The method and the system provide by the invention have the advantages of high timeliness, high flexibility, outstanding effects and high practical values.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance scanning, in particular to a magnetic resonance data acquisition method and a magnetic resonance imaging system. Background technique [0002] As we all know, MRI scanning technology is widely used in medical treatment as an important imaging technology, and its specific application fields include but not limited to: MR Angiography (MRA), susceptibility weighted imaging (SWI), phase Compared with MRA (phase contrast MRA, PC MRA), velocity encoding blood flow imaging (velocity encoding blood flow imaging), flow compensation phase imaging and neck angiography, etc., however, the flow effect of human blood will have a negative impact on the results of MRI scans , resulting in distortion of the scanned image. [0003] This flow effect can adversely affect a variety of scan sequences including, but not limited to: gradient echo, spin echo, steady state free processing , SSFP), etc., this a...

AI Technical Summary

Problems solved by technology

The use of short echo time TE can make the development time of the flow effect short without causing obvious signal phase changes, and can effectively reduce the flow effect of each order. This method will bring great influence on the setting of scanning parameters and image contrast. In addition, there will still be some residual flow effects;

[0007] (2) Use complex high-order flow compensation gradient design, so that the overall second-order integral (acceleration) or third-order integral (rhythm) of the compensation gradient is zero, which can completely remove the flow effect of the corresponding order mathematically , but this kind of high-order flow compensation gradient design is often very complicated and takes a long scan time, and due to the imperfect factors of hardware and system itself, it is actually not practical

[0008] To sum up, there is currently no practical method that can effectively and flexibly reduce higher-order flow effects

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