Daniel B Ennis

Summary

Publications

  1. pmc Changes in mitral annular geometry and dynamics with ß-blockade in patients with degenerative mitral valve disease
    Daniel B Ennis
    Department of Radiological Sciences, David Geffen School of Medicine at UCLA, Los Angeles, Calif 90095, USA
    Circ Cardiovasc Imaging 3:687-93. 2010
  2. pmc Reduced systolic torsion in chronic "pure" mitral regurgitation
    Daniel B Ennis
    Department of Cardiothoracic Surgery and the Division of Cardiovascular Medicine, Stanford University, Stanford, California 94305 5488, USA
    Circ Cardiovasc Imaging 2:85-92. 2009
  3. pmc Alterations in transmural myocardial strain: an early marker of left ventricular dysfunction in mitral regurgitation?
    Carl J Carlhäll
    Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, CA 94305 5247, USA
    Circulation 118:S256-62. 2008
  4. ncbi request reprint Active stiffening of mitral valve leaflets in the beating heart
    Akinobu Itoh
    Department of Cardiothoracic Surgery, School of Medicine, Stanford University, Stanford, California, USA
    Am J Physiol Heart Circ Physiol 296:H1766-73. 2009
  5. ncbi request reprint Altered myocardial shear strains are associated with chronic ischemic mitral regurgitation
    Tom C Nguyen
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    Ann Thorac Surg 83:47-54. 2007
  6. pmc The effect of pure mitral regurgitation on mitral annular geometry and three-dimensional saddle shape
    Tom C Nguyen
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    J Thorac Cardiovasc Surg 136:557-65. 2008
  7. pmc Regional mitral leaflet opening during acute ischemic mitral regurgitation
    Wolfgang Bothe
    Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    J Heart Valve Dis 18:586-96; discussion 597. 2009
  8. pmc Mitral annular hinge motion contribution to changes in mitral septal-lateral dimension and annular area
    Akinobu Itoh
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA 94305, USA
    J Thorac Cardiovasc Surg 138:1090-9. 2009
  9. pmc Material properties of the ovine mitral valve anterior leaflet in vivo from inverse finite element analysis
    Gaurav Krishnamurthy
    Department of Cardiothoracic Surgery, Stanford University, Stanford, California, USA
    Am J Physiol Heart Circ Physiol 295:H1141-H1149. 2008
  10. pmc Myofiber angle distributions in the ovine left ventricle do not conform to computationally optimized predictions
    Daniel B Ennis
    Department of Cardiothoracic Surgery, 300 Pasteur Drive, Falk CVRB, Stanford University, Stanford, CA 94305 5488, USA
    J Biomech 41:3219-24. 2008

Collaborators

Detail Information

Publications26

  1. pmc Changes in mitral annular geometry and dynamics with ß-blockade in patients with degenerative mitral valve disease
    Daniel B Ennis
    Department of Radiological Sciences, David Geffen School of Medicine at UCLA, Los Angeles, Calif 90095, USA
    Circ Cardiovasc Imaging 3:687-93. 2010
    ..The objective of this study was to quantify the effects of a short duration of β-blocker treatment on mitral annular dimensions and dynamics in patients with MR due to primary degenerative valve disease...
  2. pmc Reduced systolic torsion in chronic "pure" mitral regurgitation
    Daniel B Ennis
    Department of Cardiothoracic Surgery and the Division of Cardiovascular Medicine, Stanford University, Stanford, California 94305 5488, USA
    Circ Cardiovasc Imaging 2:85-92. 2009
    ..We tested the hypothesis that chronic "pure" MR alone reduces global LV torsion...
  3. pmc Alterations in transmural myocardial strain: an early marker of left ventricular dysfunction in mitral regurgitation?
    Carl J Carlhäll
    Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, CA 94305 5247, USA
    Circulation 118:S256-62. 2008
    ..We hypothesized that changes in LV transmural myocardial strain represent an early marker of LV dysfunction in an ovine chronic MR model...
  4. ncbi request reprint Active stiffening of mitral valve leaflets in the beating heart
    Akinobu Itoh
    Department of Cardiothoracic Surgery, School of Medicine, Stanford University, Stanford, California, USA
    Am J Physiol Heart Circ Physiol 296:H1766-73. 2009
    ....
  5. ncbi request reprint Altered myocardial shear strains are associated with chronic ischemic mitral regurgitation
    Tom C Nguyen
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    Ann Thorac Surg 83:47-54. 2007
    ..We tested the hypothesis that IMR perturbs adjacent myocardial LV systolic strains...
  6. pmc The effect of pure mitral regurgitation on mitral annular geometry and three-dimensional saddle shape
    Tom C Nguyen
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    J Thorac Cardiovasc Surg 136:557-65. 2008
    ..To examine whether these perturbations are caused by the ischemic insult, mitral regurgitation, or both, we investigated the effects of pure mitral regurgitation (low pressure volume overload) on annular geometry and shape...
  7. pmc Regional mitral leaflet opening during acute ischemic mitral regurgitation
    Wolfgang Bothe
    Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    J Heart Valve Dis 18:586-96; discussion 597. 2009
    ..The diastolic MV opening dynamics were quantified along the entire valvular coaptation line in an ovine model of acute IMR...
  8. pmc Mitral annular hinge motion contribution to changes in mitral septal-lateral dimension and annular area
    Akinobu Itoh
    Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA 94305, USA
    J Thorac Cardiovasc Surg 138:1090-9. 2009
    ..Normal physiologic mechanisms of annular motion are incompletely understood, and more complete characterization is needed to provide rational basis for annuloplasty ring design and to enhance clinical outcomes...
  9. pmc Material properties of the ovine mitral valve anterior leaflet in vivo from inverse finite element analysis
    Gaurav Krishnamurthy
    Department of Cardiothoracic Surgery, Stanford University, Stanford, California, USA
    Am J Physiol Heart Circ Physiol 295:H1141-H1149. 2008
    ..This could have important implications, not only to our understanding of mitral valve physiology in the beating heart but for providing additional information to aid the development of more durable tissue-engineered bioprosthetic valves...
  10. pmc Myofiber angle distributions in the ovine left ventricle do not conform to computationally optimized predictions
    Daniel B Ennis
    Department of Cardiothoracic Surgery, 300 Pasteur Drive, Falk CVRB, Stanford University, Stanford, CA 94305 5488, USA
    J Biomech 41:3219-24. 2008
    ..To test the predictive capability of the current computational model would we propose using an ovine specific LV geometry and comparing the computed myofiber orientations to those we report herein...
  11. pmc Quantitative assessment of systolic and diastolic left ventricular twist using Fourier Analysis of Stimulated echoes (FAST) and CSPAMM
    Meral Reyhan
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California 90095 7206, USA
    J Magn Reson Imaging 37:678-83. 2013
    ..To evaluate Fourier Analysis of Stimulated echoes (FAST) and CSPAMM for the quantification of left ventricular (LV) systolic and diastolic function and compare it with the previously validated FAST+SPAMM technique...
  12. ncbi request reprint Linear invariant tensor interpolation applied to cardiac diffusion tensor MRI
    Jin Kyu Gahm
    Department of Radiological Sciences, UCLA, CA 90095, USA
    Med Image Comput Comput Assist Interv 15:494-501. 2012
    ..Various methods exist for interpolating diffusion tensor fields, but none of them linearly interpolate tensor shape attributes. Linear interpolation is expected not to introduce spurious changes in tensor shape...
  13. doi request reprint Injection of gadolinium contrast through pediatric central venous catheters: a safety study
    John M Moriarty
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA 90095 7206, USA
    Pediatr Radiol 42:1064-9. 2012
    ..Consequently, many institutions mandate hand injection for MR angiography, limiting precision of infusion rates and durations of delivery...
  14. pmc The presence of two local myocardial sheet populations confirmed by diffusion tensor MRI and histological validation
    Geoffrey L Kung
    Department of Radiological Sciences, University of California, Los Angeles, California 90024, USA
    J Magn Reson Imaging 34:1080-91. 2011
    ....
  15. doi request reprint The dependence of radiofrequency induced pacemaker lead tip heating on the electrical conductivity of the medium at the lead tip
    Deborah A Langman
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
    Magn Reson Med 68:606-13. 2012
    ..Pacemaker lead tip heating is dependent upon the electrical conductivity of the solution at the lead tip and should be considered when planning in vitro gel or saline experiments...
  16. pmc Chemical shift-induced phase errors in phase-contrast MRI
    Matthew J Middione
    Department of Radiological Sciences, University of California, Los Angeles, California, USA
    Magn Reson Med 69:391-401. 2013
    ..5 mL vs. 6.4 ± 2.8 mL, P = 0.01), main pulmonary artery (2.0 ± 0.9 mL vs. 11.9 ± 5.8 mL, P = 0.04), the left pulmonary artery (1.3 ± 0.9 mL vs. 5.4 ± 2.5 mL, P = 0.003), and all vessels (1.7 ± 0.8 mL vs. 7.2 ± 4.4 mL, P = 0.001)...
  17. pmc Fourier analysis of STimulated echoes (FAST) for the quantitative analysis of left ventricular twist
    Meral Reyhan
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
    J Magn Reson Imaging 35:587-93. 2012
    ..To validate a novel method for the rapid and facile quantification of left ventricular (LV) twist from tagged magnetic resonance images and demonstrate the potential clinical utility in a series of 20 healthy volunteers...
  18. ncbi request reprint Transmural left ventricular shear strain alterations adjacent to and remote from infarcted myocardium
    Allen Cheng
    Department of Cardiovascular and Thoracic Surgery, Stanford University School of Medicine, Stanford, California 94305 5247, USA
    J Heart Valve Dis 15:209-18; discussion 218. 2006
    ..The hypothesis was tested that localized infarction perturbs transmural strain patterns not only in adjacent regions but also at remote sites...
  19. pmc Off-resonance insensitive complementary SPAtial Modulation of Magnetization (ORI-CSPAMM) for quantification of left ventricular twist
    Meral Reyhan
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA Biomedical Physics Interdepartmental Program, University of California, Los Angeles, California, USA
    J Magn Reson Imaging 39:339-45. 2014
    ....
  20. doi request reprint The effects of noise over the complete space of diffusion tensor shape
    Jin Kyu Gahm
    Department of Computer Science, University of California, Los Angeles, CA 90095, United States Department of Radiological Sciences, University of California, Los Angeles, CA 90095, United States Electronic address
    Med Image Anal 18:197-210. 2014
    ....
  21. pmc Analytical method to measure three-dimensional strain patterns in the left ventricle from single slice displacement data
    Abbas Nasiraei Moghaddam
    Department of Radiological Sciences, Diagnostic Cardiovascular Imaging Section, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
    J Cardiovasc Magn Reson 12:33. 2010
    ..The technique assumes incompressibility of the myocardium as a physical constraint...
  22. doi request reprint Device artifact reduction for magnetic resonance imaging of patients with implantable cardioverter-defibrillators and ventricular tachycardia: late gadolinium enhancement correlation with electroanatomic mapping
    Steven M Stevens
    UCLA Cardiac Arrhythmia Center, UCLA Health System, David Geffen School of Medicine at UCLA, Los Angeles, California
    Heart Rhythm 11:289-98. 2014
    ..However, the majority of patients referred for ventricular tachycardia (VT) ablation have an implantable cardioverter-defibrillator (ICD), which obscures image integrity and the clinical utility of MRI...
  23. ncbi request reprint Velocity encoding with the slice select refocusing gradient for faster imaging and reduced chemical shift-induced phase errors
    Matthew J Middione
    Department of Radiological Sciences, University of California, Los Angeles, California, USA Biomedical Physics Interdepartmental Program, University of California, Los Angeles, California, USA
    Magn Reson Med 71:2014-23. 2014
    ..To investigate a novel phase-contrast MRI velocity-encoding technique for faster imaging and reduced chemical shift-induced phase errors...
  24. pmc Intra- and interscan reproducibility using Fourier Analysis of STimulated Echoes (FAST) for the rapid and robust quantification of left ventricular twist
    Meral Reyhan
    Biomedical Physics Interdepartmental Program University of California, Los Angeles, California, USA Department of Radiological Sciences, University of California, Los Angeles, California, USA
    J Magn Reson Imaging 39:463-8. 2014
    ....
  25. doi request reprint Pacemaker lead tip heating in abandoned and pacemaker-attached leads at 1.5 Tesla MRI
    Deborah A Langman
    Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
    J Magn Reson Imaging 33:426-31. 2011
    ..To assess the risk of RF-induced heating in pacemaker-attached and abandoned leads using in vitro temperature measurements at 1.5 Tesla as a function of lead length...
  26. ncbi request reprint Orthogonal tensor invariants and the analysis of diffusion tensor magnetic resonance images
    Daniel B Ennis
    Department of Radiology, Stanford University, Palo Alto, California 94305 5488, USA
    Magn Reson Med 55:136-46. 2006
    ....