Vibration-synchronized magnetic resonance imaging for the detection of myocardial elasticity changes. Elgeti, T., Tzsch�tzsch, H., Hirsch, S., Krefting, D., Klatt, D., Niendorf, T., Braun, J.R., & Sack, I. Magn Reson Med, 67(4):919--924, Apr, 2012.
Vibration-synchronized magnetic resonance imaging for the detection of myocardial elasticity changes. [link]Paper  doi  abstract   bibtex   
Vibration synchronized magnetic resonance imaging of harmonically oscillating tissue interfaces is proposed for cardiac magnetic resonance elastography. The new approach exploits cardiac triggered cine imaging synchronized with extrinsic harmonic stimulation (f = 22.83 Hz) to display oscillatory tissue deformations in magnitude images. Oscillations are analyzed by intensity threshold-based image processing to track wave amplitude variations over the cardiac cycle. In agreement to literature data, results in 10 volunteers showed that endocardial wave amplitudes during systole (0.13 � 0.07 mm) were significantly lower than during diastole (0.34 � 0.14 mm, P < 0.001). Wave amplitudes were found to decrease 117 � 40 ms before myocardial contraction and to increase 75 � 31 ms before myocardial relaxation. Vibration synchronized magnetic resonance imaging improves the temporal resolution of magnetic resonance elastography as it overcomes the use of extra motion encoding gradients, is less sensitive to susceptibility artifacts, and does not suffer from dynamic range constraints frequently encountered in phase-based magnetic resonance elastography.
@article{ Elgeti2012,
  author = {Elgeti, Thomas and Tzsch�tzsch, Heiko and Hirsch, Sebastian and Krefting,
	Dagmar and Klatt, Dieter and Niendorf, Thoralf and Braun, J�rgen
	and Sack, Ingolf},
  title = {Vibration-synchronized magnetic resonance imaging for the detection
	of myocardial elasticity changes.},
  journal = {Magn Reson Med},
  year = {2012},
  volume = {67},
  pages = {919--924},
  number = {4},
  month = {Apr},
  abstract = {Vibration synchronized magnetic resonance imaging of harmonically
	oscillating tissue interfaces is proposed for cardiac magnetic resonance
	elastography. The new approach exploits cardiac triggered cine imaging
	synchronized with extrinsic harmonic stimulation (f = 22.83 Hz) to
	display oscillatory tissue deformations in magnitude images. Oscillations
	are analyzed by intensity threshold-based image processing to track
	wave amplitude variations over the cardiac cycle. In agreement to
	literature data, results in 10 volunteers showed that endocardial
	wave amplitudes during systole (0.13 � 0.07 mm) were significantly
	lower than during diastole (0.34 � 0.14 mm, P < 0.001). Wave amplitudes
	were found to decrease 117 � 40 ms before myocardial contraction
	and to increase 75 � 31 ms before myocardial relaxation. Vibration
	synchronized magnetic resonance imaging improves the temporal resolution
	of magnetic resonance elastography as it overcomes the use of extra
	motion encoding gradients, is less sensitive to susceptibility artifacts,
	and does not suffer from dynamic range constraints frequently encountered
	in phase-based magnetic resonance elastography.},
  doi = {10.1002/mrm.24185},
  institution = {Department of Radiology, Charit�-Universit�tsmedizin Berlin, Berlin,
	Germany.},
  keywords = {Adult; Artifacts; Elastic Modulus; Elasticity Imaging Techniques,
	methods; Humans; Magnetic Resonance Imaging, Cine, methods; Male;
	Middle Aged; Myocardial Contraction, physiology; Statistics, Nonparametric;
	Ventricular Function, Left, physiology; Vibration},
  language = {eng},
  medline-pst = {ppublish},
  owner = {Heiko},
  pmid = {22294295},
  timestamp = {2013.07.26},
  url = {http://dx.doi.org/10.1002/mrm.24185}
}
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