Analysis of residual coronary artery motion for breath hold and navigator approaches using real-time coronary MRI

TY - JOUR

T1 - Analysis of residual coronary artery motion for breath hold and navigator approaches using real-time coronary MRI

AU - Fischer, R W

AU - Botnar, R M

AU - Nehrke, K

AU - Boesiger, P

AU - Manning, W J

AU - Peters, D C

PY - 2006/3

Y1 - 2006/3

N2 - Coronary artery MRI methods utilize breath holds, or diaphragmatic navigators, to compensate for respiratory motion. To increase image quality and navigator (NAV) gating efficiency, slice tracking is used, with more sophisticated aff ine motion models recently introduced. This study assesses the extent of remaining coronary artery motion in free breathing NAV and single and multi breath hold coronary artery MRI. Additionally, the effect of the NAV gating window size was examined. To visualize and measure the respiratory induced motion, an image containing a coronary artery cross section was acquired at each heartbeat. The amount of residual coronary artery displacement was used as a direct measure for the performance of the respiratory motion correction method. Free breathing studies with motion compensation (slice tracking with 5 mm gating window) had a similar amount of residual motion (0.76 +/- 0.17 mm) as a single breath hold (0.52 +/- 0.20 mm) and were superior to multiple breath holds (1.22 +/- 0.60 mm). Affine NAV methods allowed for larger gating windows (similar to 10 mm windows) with similar residual motion (0.74 +/- 0.17 mm). In this healthy adult cohort (N = 10), free-breathing NAV methods offered respiratory motion suppression similar to a single breath hold. Magn Reson Med 55:612-618, 2006. (c) 2006 Wiley-Liss, Inc

AB - Coronary artery MRI methods utilize breath holds, or diaphragmatic navigators, to compensate for respiratory motion. To increase image quality and navigator (NAV) gating efficiency, slice tracking is used, with more sophisticated aff ine motion models recently introduced. This study assesses the extent of remaining coronary artery motion in free breathing NAV and single and multi breath hold coronary artery MRI. Additionally, the effect of the NAV gating window size was examined. To visualize and measure the respiratory induced motion, an image containing a coronary artery cross section was acquired at each heartbeat. The amount of residual coronary artery displacement was used as a direct measure for the performance of the respiratory motion correction method. Free breathing studies with motion compensation (slice tracking with 5 mm gating window) had a similar amount of residual motion (0.76 +/- 0.17 mm) as a single breath hold (0.52 +/- 0.20 mm) and were superior to multiple breath holds (1.22 +/- 0.60 mm). Affine NAV methods allowed for larger gating windows (similar to 10 mm windows) with similar residual motion (0.74 +/- 0.17 mm). In this healthy adult cohort (N = 10), free-breathing NAV methods offered respiratory motion suppression similar to a single breath hold. Magn Reson Med 55:612-618, 2006. (c) 2006 Wiley-Liss, Inc

U2 - 10.1002/mrm.20809

DO - 10.1002/mrm.20809

M3 - Article

SN - 1522-2594

VL - 55

SP - 612

EP - 618

JO - Magnetic Resonance in Medicine

JF - Magnetic Resonance in Medicine

IS - 3

ER -