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Abstract #1559

Increased speed and image quality for single shot fast spin echo imaging in the pelvis via variable refocusing flip angles and full-Fourier acquisition

Andreas M. Loening 1 , Manojkumar Saranathan 1 , Daniel V. Litwiller 2 , Ann Shimakawa 2 , Lloyd Estkowski 2 , and Shreyas S. Vasanawala 1

1 Dept. of Radiology, Stanford University, Stanford, CA, United States, 2 GE Healthcare Global MR Applications and Workflow, Rochester, MN/Menlo Park, CA, United States

Single shot fast spin echo (SSFSE) imaging is limited in acquisition speed by specific absorption rate (SAR), and compromised in image quality due to factors such as T2-decay over the echo train and half-Fourier k-space acquisition. We developed a variant utilizing variable refocusing flip angles (vrfSSFSE) that achieved a 2-fold reduction in TR at 3T due to reduced SAR, and due to T2-decay prolongation allowed full-Fourier k-space acquisition while retaining clinically relevant echo times. This pulse sequence was clinically tested for pelvic imaging in 25 patients, and demonstrated a doubling of imaging speed with improved image quality measures.

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