Abstract #1826

Rapid Multi-echo Ultrashort Time Echo Imaging for MR-based Attenuation Correction in PET/MR

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 MR-based attenuation correction (MRAC) is necessary to enable quantitative PET imaging in PET/MR. Unfortunately, identification of bone via MR methods is technically challenging due to its short T2*. Thus, ultrashort time echo (UTE) techniques have been proposed. In this study, we explored rapid multi-echo frequency encoded UTE and ramped hybrid encoding (RHE) for UTE-based imaging schemes for MRAC with clinically feasible scan times (<35sec). By using an IDEAL-based signal model for long T2* suppression, multi-echo hybrid encoding UTE imaging performed better than frequency encoded UTE.

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