METHOD AND APPARATUS FOR OPTIMIZING BALANCED STEADY STATE FREE PRECESSION SEQUENCE

WIPO Patent Application WO/2019/041123

A1

Disclosed is a method for optimizing a balanced steady state free precession sequence. The method comprises the following steps: step a: carrying out data sampling in a whole readout gradient time of a frequency encoding gradient; step b: carrying out sequence gradient design on a balanced steady state free precession sequence, so as to prevent overlapping with another two axes of gradients in a whole frequency encoding gradient time; step c: using, in the frequency encoding gradient, i.e. a readout gradient, a system allowable maximum gradient amplitude and ramp rate; and step d: re-allocating the maximum amplitudes and the maximum ramp rates of three gradient axes, i.e. a frequency encoding dephase gradient, a slice selection refocusing gradient and a phase encoding gradient, so that the gradient axis with the maximum moment has the highest maximum gradient amplitude and maximum ramp rate. A time occupied by three gradients together is reduced to the minimum. Correspondingly, a frequency encoding refocusing gradient, a slice selection dephase gradient and a phase encoding restoration gradient are also subjected to the same gradient performance allocation and processing, thus obtaining the shortest repetition time.

ZHU YANJIE (CN)
LIANG DONG (CN)
LIU XIN (CN)
ZHENG HAIRONG (CN)

PCT/CN2017/099430

March 07, 2019

August 29, 2017

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SHENZHEN INST ADV TECH (CN)

G01R33/565; A61B5/055

CN104297708A	2015-01-21
CN104523274A	2015-04-22
CN101299061A	2008-11-05
CN1711965A	2005-12-28
US8283924B2	2012-10-09
US20160116559A1	2016-04-28

SYNCLAW ATTORNEYS (CN)

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