Abstract #3727

Optimizing trajectory ordering for faster small-tip center-out radial gradient echo(GRE)

Xucheng Zhu^1,2, Kevin Johnson^3,4, and Peder Larson^1,2

¹Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, United States, ²UC Berkeley-UCSF Graduate Program in Bioengineering, University of California, San Francisco and University of California, Berkeley, Berkeley, CA, United States, ³Medical Physics, University of Wisconsin, Madison, Madison, WI, United States, ⁴Radiology, University of Wisconsin, Madison, Madison, WI, United States

Center-out sequence has natural spoiling effect, called “self” spoiling. By leveraging this idea, the standard large spoiler gradient could be reduced or removed without sacrificing the image quality. In this study, we investigated how 3D radial trajectory ordering affects spoiling, and proposed a reordered 2D golden angle scheme to maximize “self” spoiling effect and retain robustness to free breathing scan. We evaluated the proposed ordering scheme on both phantom and volunteer. Proposed scheme without or with small spoiler gradient can reduce up to 40% scan time to get comparable image quality.

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