title: Whole-heart coronary MRA with 100% respiratory gating efficiency: self-navigated three-dimensional retrospective image-based motion correction (TRIM).
abstract: OBJECTIVE
  To develop a three-dimensional retrospective image-based motion correction technique for whole-heart coronary MRA with self-navigation that eliminates both the need to setup a diaphragm navigator and gate the acquisition.
  
  
  METHODS
  The proposed technique uses one-dimensional self-navigation to track the superior-inferior translation of the heart, with which the acquired three-dimensional radial k-space data is segmented into different respiratory bins. Respiratory motion is then estimated in image space using an affine transform model and subsequently this information is used to perform efficient motion correction in k-space. The performance of the proposed technique on healthy volunteers is compared with the conventional navigator gating approach as well as data binning using diaphragm navigator.
  
  
  RESULTS
  The proposed method is able to reduce the imaging time to 7.1±0.5 min from 13.9±2.6 min with conventional navigator gating. The scan setup time is reduced as well due to the elimination of the navigator. The proposed method yields excellent image quality comparable with either conventional navigator gating or the navigator binning approach.
  
  
  CONCLUSIONS
  We have developed a new respiratory motion correction technique for coronary MRA that enables 1 mm(3) isotropic resolution and whole-heart coverage with 7 min of scan time. Further tests on patient population are needed to determine its clinical usage.
authors: Department of Radiology and Biomedical Engineering, Northwestern University, Chicago, Illinois, USA; Biomedical Imaging Research Institute, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA.
authors: Jianing
authors: J
authors: Pang
authors: Himanshu
authors: H
authors: Bhat
authors: Behzad
authors: B
authors: Sharif
authors: Zhaoyang
authors: Z
authors: Fan
authors: Louise E J
authors: LE
authors: Thomson
authors: Troy
authors: T
authors: LaBounty
authors: John D
authors: JD
authors: Friedman
authors: James
authors: J
authors: Min
authors: Daniel S
authors: DS
authors: Berman
authors: Debiao
authors: D
authors: Li
mesh_terms: D000328:Adult; D000465:Algorithms; D016477:Artifacts; D017023:Coronary Angiography / Q000379:methods*; D003331:Coronary Vessels / Q000033:anatomy & histology; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D009038:Motion; D012016:Reference Values; D015203:Reproducibility of Results; D055425:Respiratory-Gated Imaging Techniques / Q000379:methods*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
keywords: 3D affine transform; 3D radial acquisition; coronary MRA; respiratory motion correction
references: Magn Reson Med. 2012 Aug;68(2):571-9
references: 22213169
references: J Magn Reson Imaging. 2000 Feb;11(2):208-14
references: 10713956
references: J Am Coll Cardiol. 2010 Sep 14;56(12):983-91
references: 20828652
references: Magn Reson Med. 2012 Dec;68(6):1866-75
references: 22367715
references: Magn Reson Med. 2004 Jul;52(1):197-203
references: 15236387
references: J Am Coll Cardiol. 2006 Nov 21;48(10):1946-50
references: 17112982
references: Magn Reson Med. 2005 Aug;54(2):476-80
references: 16032682
references: J Magn Reson Imaging. 2002 Jun;15(6):661-71
references: 12112516
references: Magn Reson Med. 2011 Dec;66(6):1541-9
references: 21604297
references: Radiology. 2001 Sep;220(3):810-5
references: 11526286
references: Radiology. 1997 Jun;203(3):733-6
references: 9169696
references: Magn Reson Med. 1995 May;33(5):713-9
references: 7596276
references: Magn Reson Med. 2012 Feb;67(2):437-45
references: 21656563
references: Magn Reson Med. 2003 Jan;49(1):151-7
references: 12509831
references: Magn Reson Med. 2006 Jul;56(1):210-5
references: 16767743
references: Magn Reson Med. 2004 Jan;51(1):93-102
references: 14705049
references: Magn Reson Med. 2011 Dec;66(6):1674-81
references: 21671266
references: Magn Reson Med. 2003 Jul;50(1):122-31
references: 12815687
references: J Magn Reson Imaging. 2007 Sep;26(3):624-9
references: 17729350
references: Magn Reson Med. 2003 Aug;50(2):235-41
references: 12876698
references: J Magn Reson Imaging. 2008 Sep;28(3):612-20
references: 18777542
references: Magn Reson Med. 2009 Sep;62(3):731-8
references: 19526514
references: J Cardiovasc Magn Reson. 1999;1(2):131-8
references: 11550345
references: Magn Reson Med. 2011 May;65(5):1269-77
references: 21500255
references: Magn Reson Med. 1999 Aug;42(2):408-11
references: 10440967
references: Magn Reson Med. 2012 Jun;67(6):1665-72
references: 22134885