Abstract #0596

Optimized 3D spiral ultra-short echo time free-breathing pulmonary imaging on a high-performance low-field 0.55T scanner

Ahsan Javed¹, Rajiv Ramasawmy¹, Joel Moss², Waqas Majeed³, Pan Su³, Thomas Benkert⁴, Himanshu Bhat³, and Adrienne E Campbell-Washburn⁵

¹Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States, ²Pulmonary Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States, ³Siemens Medical Solutions USA Inc., Malvern, PA, United States, ⁴Siemens Healthcare GmbH, Erlangen, Germany, ⁵Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institute of Health, Bethesda, MD, United States

Low signal in the lung parenchyma, and reduced signal-to-noise at 0.55T makes high resolution lung imaging challenging. SNR can be improved by using longer spiral readouts. However, these readouts are susceptible to artifacts from trajectory errors, and blurring from concomitant fields which are amplified at lower field strengths. Here we present an optimized self-gated, ultra-short echo time, stack-of-spirals acquisition which leverages inline corrections for trajectory imperfections, measurement drift, and concomitant fields to enable robust high resolution lung imaging on low field scanners. We also demonstrate the improvement in image quality in patients with lung nodules and Lymphangioleiomyomatosis (LAM).

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