Optimization of realtime adaptive navigator correction for 3D magnetic resonance coronary angiography

Breathing motion artifacts reduce the quality of MR coronary artery images. Real‐time adaptive navigator correction with different correction factors (0%, 30%, 60%, 80% of diaphragmatic displacement) was used to correct for respiratory motion in 3D coronary artery imaging. Significant improvements of image quality were achieved by adaptive motion correction in comparison with conventional navigator gating. A close correlation between the correction factor, which yielded optimal image quality, and cardiac displacement relative to diaphragmatic displacement was found. The quality of coronary artery imaging can be improved using real‐time adaptive navigator correction. Correction factors have to be adjusted for each segment of the coronary arteries and for each patient. Magn Reson Med 42:408–411, 1999. © 1999 Wiley‐Liss, Inc.

[1]  J Keegan,et al.  Magnetic resonance imaging of coronary arteries: technique and preliminary results. , 1993, British heart journal.

[2]  M. McConnell,et al.  Prospective adaptive navigator correction for breath‐hold MR coronary angiography , 1997, Magnetic resonance in medicine.

[3]  S. Riederer,et al.  Respiratory Motion of the Heart: Kinematics and the Implications for the Spatial Resolution in Coronary Imaging , 1995, Magnetic resonance in medicine.

[4]  M Weiger,et al.  Motion‐adapted gating based on k‐space weighting for reduction of respiratory motion artifacts , 1997, Magnetic resonance in medicine.

[5]  H. W. Korin,et al.  Adaptive technique for three-dimensional MR imaging of moving structures. , 1990, Radiology.

[6]  M. McConnell,et al.  Prospective navigator correction of image position for coronary MR angiography. , 1997, Radiology.

[7]  Bob S. Hu,et al.  Fast Spiral Coronary Artery Imaging , 1992, Magnetic resonance in medicine.

[8]  E. Haacke,et al.  Pseudo‐gating: Elimination of periodic motion artifacts in magnetic resonance imaging without gating , 1987, Magnetic resonance in medicine.

[9]  M B Scheidegger,et al.  Coronary artery imaging in multiple 1-sec breath holds. , 1993, Magnetic resonance imaging.

[10]  H. Hricak,et al.  Magnetic resonance imaging with respiratory gating: techniques and advantages. , 1984, AJR. American journal of roentgenology.

[11]  M. McConnell,et al.  Comparison of respiratory suppression methods and navigator locations for MR coronary angiography. , 1997, AJR. American journal of roentgenology.

[12]  Todd S. Sachs,et al.  Real‐time motion detection in spiral MRI using navigators , 1994, Magnetic resonance in medicine.

[13]  R. Edelman,et al.  A preliminary report comparing magnetic resonance coronary angiography with conventional angiography. , 1993, The New England journal of medicine.

[14]  J. Felmlee,et al.  Adaptive technique for high-definition MR imaging of moving structures. , 1989, Radiology.

[15]  S. Riederer,et al.  Navigator-echo-based real-time respiratory gating and triggering for reduction of respiration effects in three-dimensional coronary MR angiography. , 1996, Radiology.