Abstract #4281

Single point based techniques for rapid and robust gradient measurement

Hyungseok Jang^1,2 and Alan B McMillan¹

¹Department of Radiology, University of Wisconsin, Madison, WI, United States, ²Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI, United States

Accurate knowledge of the k-space trajectory is critical for artifact-free MR imaging, particularly in non-Cartesian imaging. In this study we propose a new gradient measurement technique based on single point imaging (SPI), which allows simple, rapid, and robust measurement of k-space trajectory. In the proposed technique, the zoom-in/out effect of SPI is used for k-space trajectory measurement. First, 1D SPI data are acquired from a targeted gradient in each axis, and then relative FOV scaling factors between encoding times are found, which represents relative k-space position. Improvements in image quality are demonstrated for UTE, spiral, and ramp-sampled IDEAL imaging.

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