| 主权项 |
1. A method of calculating parameters to be used in an MR scan, comprising:
i) defining a cost function, C, in dependence at least on:
a) a determined range of magnetic susceptibility gradients, Gzs,min<Gzs<Gzs,max, of an object to be scanned;b) a quadratic phase variation, a, of a transverse magnetic field induced by an RF pulse;c) a plurality of parameters defining a slice selection gradient, Gz, and a slice refocusing gradient, Gz,ref; ii) determining a value of the quadratic phase variation, a, and values for the plurality of parameters defining the slice selection gradient, Gz, and the slice refocusing gradient, Gz,ref, such that the cost function, C, is maximised; wherein the determined values, when used as parameters of an MR scan, improve the detectability of an MR signal over the determined range of magnetic susceptibility gradients. |
