Rohan Dharmakumar

Summary

Affiliation: University of Toronto
Country: Canada

Publications

  1. doi request reprint Deriving blood-oxygen-level-dependent contrast in MRI with T2*-weighted, T2-prepared and phase-cycled SSFP methods: theory and experiment
    Jain Mangalathu Arumana
    Department of Radiology, Northwestern University, Chicago, Illinois 60611, USA
    Magn Reson Med 59:561-70. 2008
  2. ncbi request reprint On the parameters affecting the sensitivity of MR measures of pressure with microbubbles
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Center, University of Toronto, Toronto, Canada
    Magn Reson Med 47:264-73. 2002
  3. ncbi request reprint Oxygen-sensitive contrast in blood for steady-state free precession imaging
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Magn Reson Med 53:574-83. 2005
  4. ncbi request reprint A novel microbubble construct for intracardiac or intravascular MR manometry: a theoretical study
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Toronto, ON M4N 3M5, Canada
    Phys Med Biol 50:4745-62. 2005
  5. ncbi request reprint Detecting microcirculatory changes in blood oxygen state with steady-state free precession imaging
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Ontario, Canada
    Magn Reson Med 55:1372-80. 2006
  6. ncbi request reprint Generating positive contrast from off-resonant spins with steady-state free precession magnetic resonance imaging: theory and proof-of-principle experiments
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Suite 700, 448 E Ontario St, Chicago, IL 60611, USA
    Phys Med Biol 51:4201-15. 2006
  7. doi request reprint Assessment of regional myocardial oxygenation changes in the presence of coronary artery stenosis with balanced SSFP imaging at 3.0 T: theory and experimental evaluation in canines
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, Illinois 60611, USA
    J Magn Reson Imaging 27:1037-45. 2008
  8. ncbi request reprint Dephased FLAPS for improved visualization of susceptibility-shifted passive devices for real-time interventional MRI
    Ioannis Koktzoglou
    Department of Radiology, Northwestern University, Suite 700, 448 E Ontario St, Chicago, IL 60611, USA
    Phys Med Biol 52:N277-86. 2007
  9. ncbi request reprint Factors influencing fast low angle positive contrast steady-state free precession (FLAPS) magnetic resonance imaging
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, IL, USA
    Phys Med Biol 52:3261-73. 2007
  10. ncbi request reprint Cardiac phase-resolved blood oxygen-sensitive steady-state free precession MRI for evaluating the functional significance of coronary artery stenosis
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, IL 60611, USA
    Invest Radiol 42:180-8. 2007

Collaborators

Detail Information

Publications11

  1. doi request reprint Deriving blood-oxygen-level-dependent contrast in MRI with T2*-weighted, T2-prepared and phase-cycled SSFP methods: theory and experiment
    Jain Mangalathu Arumana
    Department of Radiology, Northwestern University, Chicago, Illinois 60611, USA
    Magn Reson Med 59:561-70. 2008
    ..5T and 3.0T; and 2) OC derived with SSFP PC can be increased above GRE and T2-prep methods with an appropriate choice of imaging parameters...
  2. ncbi request reprint On the parameters affecting the sensitivity of MR measures of pressure with microbubbles
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Center, University of Toronto, Toronto, Canada
    Magn Reson Med 47:264-73. 2002
    ..15%, and have a volumetric magnetic susceptibility difference of at least 34 ppm...
  3. ncbi request reprint Oxygen-sensitive contrast in blood for steady-state free precession imaging
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Magn Reson Med 53:574-83. 2005
    ..It is envisioned that this method could be instrumental in real-time imaging focused on detecting diseases where the oxygen state of blood is impaired...
  4. ncbi request reprint A novel microbubble construct for intracardiac or intravascular MR manometry: a theoretical study
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Toronto, ON M4N 3M5, Canada
    Phys Med Biol 50:4745-62. 2005
    ..5 T must be 2-3 microm in radius and be uniformly coated with single-domain magnetic nanoparticles, such as magnetite, at shell volume fractions below 5%...
  5. ncbi request reprint Detecting microcirculatory changes in blood oxygen state with steady-state free precession imaging
    Rohan Dharmakumar
    Department of Medical Biophysics, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Ontario, Canada
    Magn Reson Med 55:1372-80. 2006
    ....
  6. ncbi request reprint Generating positive contrast from off-resonant spins with steady-state free precession magnetic resonance imaging: theory and proof-of-principle experiments
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Suite 700, 448 E Ontario St, Chicago, IL 60611, USA
    Phys Med Biol 51:4201-15. 2006
    ..Among practical applications, we anticipate that the proposed technique can potentially facilitate high field magnetic-resonance-based molecular imaging...
  7. doi request reprint Assessment of regional myocardial oxygenation changes in the presence of coronary artery stenosis with balanced SSFP imaging at 3.0 T: theory and experimental evaluation in canines
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, Illinois 60611, USA
    J Magn Reson Imaging 27:1037-45. 2008
    ..To examine the dependence of steady-state free-precession (SSFP) -based myocardial blood-oxygen-level-dependent (BOLD) contrast on field strength using theoretical and experimental models...
  8. ncbi request reprint Dephased FLAPS for improved visualization of susceptibility-shifted passive devices for real-time interventional MRI
    Ioannis Koktzoglou
    Department of Radiology, Northwestern University, Suite 700, 448 E Ontario St, Chicago, IL 60611, USA
    Phys Med Biol 52:N277-86. 2007
    ..In comparison to FLAPS imaging, results demonstrate that dFLAPS imaging of thick, projection-like slices improves the contrast of susceptibility-shifted devices relative to background signal with no increase in acquisition time...
  9. ncbi request reprint Factors influencing fast low angle positive contrast steady-state free precession (FLAPS) magnetic resonance imaging
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, IL, USA
    Phys Med Biol 52:3261-73. 2007
    ....
  10. ncbi request reprint Cardiac phase-resolved blood oxygen-sensitive steady-state free precession MRI for evaluating the functional significance of coronary artery stenosis
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, Chicago, IL 60611, USA
    Invest Radiol 42:180-8. 2007
    ....
  11. doi request reprint Off-resonance positive contrast imaging of a passive endomyocardial catheter in swine
    Rohan Dharmakumar
    Department of Radiology, Northwestern University, 737 N Michigan Ave, Suite 1616, Chicago, IL 60611, USA
    Phys Med Biol 53:N249-57. 2008
    ..9 in LV myocardium). The findings show that off-resonance imaging with the FLAPS method may be used for passive device visualization with positive contrast. Further studies are necessary prior to clinical translation...