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Table 2 CMR parameters for 2D and 4D velocity acquisition scans

From: Systemic-to-pulmonary collateral flow in patients with palliated univentricular heart physiology: measurement using cardiovascular magnetic resonance 4D velocity acquisition

  2D velocity acquisition 4D velocity acquisition
Field of view (mm) 150 x 300 200 x 300
Acquired voxel size (mm) 2.3 x 2.3 x 7 2.4 x 2.5 x 2.5
Reconstructed voxel size (mm) 1.2 x 1.2 x 7 1.5 x 1.5 x 2.3
Number of slices 1 25-40
Cardiac gating Retrospective Retrospective
Respiratory motion Non-gated Non-gated
Free breathing Free breathing
NSA 2 1
TR(ms)/TE(ms) 5/3 3.2 /1.9
Flip angle (°) 10 5
SENSE No 2
Reconstructed cardiac phases 35-40 22-25
VEC (cm/s) 60-100 (venous vessels) 200–400 (arterial vessels) 150-400
  1. 2D, two-dimensional; 4D, four-dimensional; CMR, cardiovascular magnetic resonance; NSA, number of signal averages; SENSE, sensitivity encoding for fast CMR; TR, repetition time; TE, echo time; VEC, velocity encoding.