TABLE 1.

Orientation of the MRI acquisitions for three experiments

Acquisition	Volume orientation	Main flow direction
Experiment 1—straight tubes
4DEPIx_ro_coronal	Coronal	Readout
4DEPIx_bp_coronal	Coronal	Blip phase‐encoding
4DEPIx_nbp_axial	Axial	Nonblip phase‐encoding
4DGRE_coronal	Coronal	Readout
Experiment 2—LV phantom
4DEPI5_ro_LA	Axial (long‐axis)	Readout
4DEPI5_bp_LA	Axial (long‐axis)	Blip phase‐encoding
4DEPI5_nbp_SA	Coronal (short‐axis)	Nonblip phase‐encoding
4DGRE_LA	Axial (long‐axis)	Phase‐encoding
Experiment 3—healthy volunteers
4DEPI5_ro_LA	Long‐axis	Readout
4DEPI5_bp_LA	Long‐axis	Blip phase‐encoding
4DEPI5_nbp_SA	Short‐axis	Nonblip phase‐encoding
4DGRE_LA	Long‐axis	Readout

For experiment 1, 4DEPIx_ro_coronal refers to EPI acquisition with the readout gradient aligned parallel to the main flow direction and reconstructed planes in coronal orientation; 4DEPIx_bp_coronal refers to EPI acquisition with the blip phase‐encoding gradient aligned parallel to the main flow direction and reconstructed planes in coronal orientation; and 4DEPIx_nbp_axial refers to EPI acquisition with the readout and blip phase‐encoding gradient both perpendicular to the main flow direction and reconstructed planes in axial orientation. The “x” after EPI is either 5 or 3, and refers to EPI factor 5 or 3. For experiments 2 and 3, 4DEPI5_ro_LA refers to EPI factor of 5 acquisition with the readout gradient aligned parallel to the main flow direction; 4DEPI5_bp_LA refers to EPI acquisition with the blip phase‐encoding gradient aligned parallel to the main flow direction; and 4DEPI5_nbp_SA refers to EPI acquisition with the readout and blip phase‐encoding gradient both perpendicular to the main flow direction.

Abbreviations: LA, long‐axis; SA, short‐axis.