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Abstract #4214

Signal Amplitude Dependence on Object Size and Shape Due to T2 Decay During Radial K-Space Readout in Ultrashort TE Sequences: A 2D Ring Model.

Jing-Tzyh Alan Chiang1, Michael Carl2, Jiang Du1, Graeme Bydder1

1Radiology, University of California San Diego, San Diego, CA, United States; 2GE Healthcare

We investigate the signal amplitude relationships due to T2 decay during radial k-space readout in ultrashort TE sequences, via numerical simulations on 2D rings of varying inner and outer diameters. Decreasing inner and increasing outer diameters lead to increased signal amplitudes at any given T2 value, which demonstrate important dependencies of signal amplitude on object shape and size. These results on 2D rings also serve as numerical models for analyzing T2 dependent signal and contrast in quantitative UTE techniques that utilize axial imaging of tubular bones, such as in cortical bone water quantification.