Pulse sequence delay correction method for magnetic resonance imaging

Abstract

The invention discloses a pulse sequence delay correction method for magnetic resonance imaging. The method comprises the steps of conducting the delay correction before a pulse sequence is compiled into hardware codes; respectively merging continuous and identical output states in each channel on a pulse sequence generator; updating the output state based on merged data; and ensuring the holding time of the output state of each channel to meet the minimum pulse width requirement of the pulse sequence generator after the time delay correction. According to the technical scheme of the invention, the time delay correction is independent of a specific pulse sequence type, thus being strong in universality. The time delay correction is conducted before the pulse sequence is compiled into hardware codes, so that the application amount of hardware logic resources is reduced. On the premise that the hardware complexity is not increased and the time delay correction precision is guaranteed, the value range of the time delay correction is expanded.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a new method for correcting time delay of magnetic resonance imaging pulse sequences. Background technique [0002] The magnetic resonance imaging system mainly includes: magnet subsystem, gradient subsystem, radio frequency subsystem, spectrometer subsystem, main computer and scanning software. Among them, the spectrometer subsystem mainly includes hardware units such as pulse sequence generator, gradient waveform generator, transmitter and receiver, as well as spectrometer computer and pulse sequence compiling software. During the imaging scanning process, that is, during the execution of the pulse sequence, the pulse sequence generator controls other hardware units in the spectrometer to work together. Under the control of the pulse sequence generator, the gradient waveform generator generates the gradient waveform signal required for imaging, the transmitt...

AI Technical Summary

Problems solved by technology

However, the prior art uses deep programmable FIFOs or registers to implement delay correction. In fact, the delay module is constructed based on the hardware logic resources on the pulse sequence generator, and the value range and accuracy of delay correction are between The difference is several orders of magnitude, so using the existing technology to build the delay module will take up a lot of hardware logic resources

In practical applications, the accuracy of delay correction is usually given priority, so the value range of delay correction is limited

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