Yutaka Natsuaki1, Randall Kroeker2, Peter Schmitt3, J. Paul Finn4, Gerhard Laub5
1Siemens Healthcare, Los Angeles, CA, United States; 2Siemens Healthcare, Winnipeg, Canada; 3Siemens Healthcare, Erlangen, Germany; 4Radiology, UCLA, Los Angeles, CA, United States; 5Siemens Healthcare, San Francisco, CA, United States
Time-resolved 3D (4D) dynamic contrast-enhanced MR angiography (DCE-MRA) offers combined anatomic and hemodynamic information with fractional Gd contrast doses. Time-resolved imaging with stochastic trajectories (TWIST) is a view-sharing technique that acquires the peripheral k-space region with lower density while acquiring central data with full sampling. With a conventional TWIST, auto-calibration signal (ACS) lines for the parallel MRI are integrated in every central data acquisition. In the current work, we propose to modify the conventional TWIST by using an optimized separate ACS lines to improve the image quality of the peak carotid artery enhancements.