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Abstract #0944

Spiral HASTE using variable-flip-angle single-shot spiral-ring TSE for rapid T2-weighted abdominal imaging

Zhixing Wang1, Xiaodong Zhong2, Yang Yang3, John Mugler4, An Liu1, Craig Meyer5, and Kun Qing1
1Radiation Oncology, City of Hope National Medical Center, Duarte, CA, United States, 2Radiological Sciences, University of California Los Angeles, Los Angeles, CA, United States, 3Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States, 4Radiology & Medical Imaging, University of Virginia, Charlottesville, VA, United States, 5Biomedical Engineering, University of Virginia, Charlottesville, VA, United States

Synopsis

Keywords: Data Acquisition, Data Acquisition, Spiral TSE, HASTE, Abdominal imaging

Motivation: Conventional Cartesian HASTE may be susceptible to image blurring, resolution loss, and artifacts in abdominal imaging.

Goal(s): To develop a 2D T2-weighted abdominal spiral HASTE technique to achieve better image sharpness, reduced scan time, and reduced power deposition compared to Cartesian HASTE.

Approach: A variable-flip-angle refocusing RF series was designed and employed to maintain high signal-intensity at middle- and late-echoes with a smooth signal-evolution compared to a constant-flip-angle scheme. Variable-density spiral-ring trajectories combined with L1-ESPIRiT reconstruction were performed to accelerate the data acquisition.

Results: Whole-abdomen spiral HASTE images were acquired with 1.5×1.5×6 mm3 spatial-resolution and 25 slices in a 7-second acquisition at 3T.

Impact: This work highlights the utilization of spiral-ring TSE acquisition along with variable-flip-angle RF pulses and L1-ESPIRiT reconstruction for accelerated single-shot abdominal imaging, providing images with improved image sharpness, shorter scan time, and reduced power deposition over conventional Cartesian HASTE.

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Abstract

Keywords