Production method for quick imaging sequence single-short EPI-SSFP (Echo Planar Imaging-Steady-State Free Procession)

Abstract

The invention discloses a production method for a quick imaging sequence single-short EPI-SSFP (Echo Planar Imaging-Steady-State Free Procession). The method comprises the following steps: setting an MRI (Magnetic Resonance Imaging) system through a selected EPI sequence template to obtain an initial state of the MRI system; calculating a deflection angle of an input radio frequency signal RF according to the selected True-SSFP sequence template; calculating the signal intensity applied to a level selective gradient in the MRI system and the time of duration according to the deflection angle; exciting the MRI system according to the calculated signal intensity and the time of duration during inputting the radio frequency signal, so as to obtain an initial single-shot EPI-SSFP sequence; then performing steady state processing for the sequence to obtain the quick imaging sequence single-shot EPI-SSFP. With the adoption of the method, the single-shot EPI-SSFP imaging quality is highly superior to that of EPI sequence, and the imaging time is highly less than that of the True-SSFP sequence, and the imaging quality meets the clinical requirement; in addition, the imaging time is short, the examination time of a patient is reduced, and thus the mobility of the patient is improved.

Description

Technical field [0001] The invention belongs to the technical field of medical imaging, and more specifically, relates to a method for generating a single-shot EPI-SSFP of a rapid imaging sequence. Background technique [0002] In recent years, because sequence design is restricted by the hardware conditions of nuclear magnetic resonance instruments, there are relatively few domestic personnel engaged in sequence research and development, and the start is relatively late, resulting in insufficient independent research and development capabilities of domestic nuclear magnetic resonance instruments, and the design and implementation of many sequences are relatively difficult . [0003] There are many types of current sequences, mainly by controlling the spectrometer to generate corresponding radio frequency pulses, phase encoding gradients, frequency encoding gradients and layer selection gradients, and applying them in the scanning area, so that the tissue generates echo signals for...

AI Technical Summary

Problems solved by technology

However, because the value of ETL is too small, the imaging time of the multi-shot EPI-SSFP sequence is long, and it cannot meet the dynamic imaging of the heart

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