Meeting Banner
Abstract #0066

High Temporal-Resolution Three-Directional Velocity Measurements in a Single Breath-Hold Using EPI and Direct Inversion

Ning Jin1, Rizwan Ahmad2, Yu Ding2, Sven Zuehlsdorff3, Orlando P. Simonetti2, 4

1Siemens Healthcare, Columbus, OH, United States; 2Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH, United States; 3Siemens Healthcare, Chicago, IL, United States; 4Department of Department of Internal Medicine, The Ohio State University, Columbus, OH, United States

A novel echo-planar (EPI) implementation of balanced four-point velocity encoded PC-MRI for rapid, breath-hold acquisition of three-directional velocity data with high temporal resolution is presented. A direct inversion with regularized least square estimation of velocities from the acquired phase data is used to increase temporal resolution by a factor of four. The combined approach enables simultaneous measurements of vx, vy, and vz with an effective temporal resolution of 14.5 ms within a single breath-hold.

Keywords

accurately achieve acquisition altered anterior aorta aortic applied approximation arch balanced bandwidth basis beat beats become binomial blood blue body bottom breath calculation candy cane clinical clinically coils combined complimented components conducted consecutive correlation curves dependent derivative descending developed diagnostic direct directional dramatically drawn effective efficiency eliminating enables encoded encodes encoding entire estimation every example excitation feasible five flow frame future good gradient heart hold implementation implemented incorporating independent insignificant inversion investigate least linear lung magnitude magnitudes major maps matrix measure measured medicine minute moments much must newly next normalize novel oblique operator orientation peak pixel planar polar prescribed prior processed proposed pulmonary pulse rapid readouts receiver reception reconstructed reconstruction reduce regularization regularized representative resolution root scanner scout segmented separate series significantly simultaneous simultaneously slightly space speed speeds spine spoiled square squares step strategy systolic table temporal thoracic traditional train transverse triggered unfortunately velocities velocity vessels view volume volunteer volunteers yielded