Optimizing trajectory ordering for fast radial ultra-short TE (UTE) acquisitions.

ABSTRACT:

Purpose

Additional spoiler gradients are required in 3D UTE sequences with random view ordering to suppress magnetization refocusing. By leveraging the encoding gradient induced spoiling effect, the spoiler gradients could potentially be reduced or removed to shorten the TR and increase encoding efficiency. An analysis framework is built that models the gradient spoiling effects and a new ordering scheme is proposed for fast 3D UTE acquisition.

Theory and methods

UTE signal evolution and spatial encoding gradient induced spoiling effect are derived from the Bloch equations. And the concept is validated in 2D radial UTE simulation. Then an optimized ordering scheme, named reordered 2D golden angle (r2DGA) scheme, for 3D UTE acquisition is proposed. The r2DGA scheme is compare

SUBMITTER: Zhu X 

PROVIDER: S-EPMC8164474 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature