Jaakko O Nieminen

Summary

Publications

  1. ncbi request reprint Current-density imaging using ultra-low-field MRI with adiabatic pulses
    Jaakko O Nieminen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland Electronic address
    Magn Reson Imaging 32:54-9. 2014
  2. doi request reprint Avoiding eddy-current problems in ultra-low-field MRI with self-shielded polarizing coils
    Jaakko O Nieminen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 212:154-60. 2011
  3. ncbi request reprint Improved determination of FID signal parameters in low-field NMR
    Juhani Dabek
    Aalto University, Department of Biomedical Engineering and Computational Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 205:148-60. 2010
  4. doi request reprint Hybrid ultra-low-field MRI and magnetoencephalography system based on a commercial whole-head neuromagnetometer
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Espoo, Finland
    Magn Reson Med 69:1795-804. 2013
  5. pmc Noise amplification in parallel whole-head ultra-low-field magnetic resonance imaging using 306 detectors
    Fa Hsuan Lin
    Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
    Magn Reson Med 70:595-600. 2013
  6. doi request reprint Gradient-excitation encoding combined with frequency and phase encodings for three-dimensional ultra-low-field MRI
    Juhani Dabek
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Aalto, Finland
    Conf Proc IEEE Eng Med Biol Soc 2012:1093-7. 2012
  7. doi request reprint Temperature dependence of relaxation times and temperature mapping in ultra-low-field MRI
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland AMI Centre, Aalto University School of Science, P O Box 13000, FI 00076 Aalto, Finland Electronic address
    J Magn Reson 235:50-7. 2013
  8. doi request reprint SQUID-sensor-based ultra-low-field MRI calibration with phantom images: towards quantitative imaging
    Juhani Dabek
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Aalto, Finland
    J Magn Reson 224:22-31. 2012
  9. doi request reprint Solving the problem of concomitant gradients in ultra-low-field MRI
    Jaakko O Nieminen
    Aalto University, Department of Biomedical Engineering and Computational Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 207:213-9. 2010
  10. ncbi request reprint Current-density imaging using ultra-low-field MRI with zero-field encoding
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland Electronic address
    Magn Reson Imaging 32:766-70. 2014

Collaborators

Detail Information

Publications12

  1. ncbi request reprint Current-density imaging using ultra-low-field MRI with adiabatic pulses
    Jaakko O Nieminen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland Electronic address
    Magn Reson Imaging 32:54-9. 2014
    ..The method may find applications, e.g., in conductivity imaging. We present simulation results showing the feasibility of the sequence...
  2. doi request reprint Avoiding eddy-current problems in ultra-low-field MRI with self-shielded polarizing coils
    Jaakko O Nieminen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 212:154-60. 2011
    ..With the presented shielding technique, ULF-MRI devices can utilize stronger and spatially broader polarizing fields than achievable with unshielded polarizing coils...
  3. ncbi request reprint Improved determination of FID signal parameters in low-field NMR
    Juhani Dabek
    Aalto University, Department of Biomedical Engineering and Computational Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 205:148-60. 2010
    ..In the measurements of this work, however, the narrow line width led to establishing a more applicable method which is based on the exponential decay of the Lorentz peak with a temporally moving power spectrum window...
  4. doi request reprint Hybrid ultra-low-field MRI and magnetoencephalography system based on a commercial whole-head neuromagnetometer
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Espoo, Finland
    Magn Reson Med 69:1795-804. 2013
    ..The performance of the device is demonstrated by presenting ultra-low-field-MR images and MEG recordings that are compared with data obtained with a 3T scanner and a commercial MEG device...
  5. pmc Noise amplification in parallel whole-head ultra-low-field magnetic resonance imaging using 306 detectors
    Fa Hsuan Lin
    Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
    Magn Reson Med 70:595-600. 2013
    ..Corroborating with previous studies, the g-factor in 2D sensitivity-encoded ultra-low-field MRI with 9 to 16-fold 2D accelerations using the SQUID array studied here may be acceptable...
  6. doi request reprint Gradient-excitation encoding combined with frequency and phase encodings for three-dimensional ultra-low-field MRI
    Juhani Dabek
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Aalto, Finland
    Conf Proc IEEE Eng Med Biol Soc 2012:1093-7. 2012
    ..The feasibility of image reconstruction with the gradient-excitation-encoding method is demonstrated by simulations...
  7. doi request reprint Temperature dependence of relaxation times and temperature mapping in ultra-low-field MRI
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland AMI Centre, Aalto University School of Science, P O Box 13000, FI 00076 Aalto, Finland Electronic address
    J Magn Reson 235:50-7. 2013
    ..The obtained results were used to reconstruct temperature maps from ultra-low-field scans. These time-dependent temperature maps measured from an agarose gel phantom at 50 μT reproduced the temperature gradient with good contrast...
  8. doi request reprint SQUID-sensor-based ultra-low-field MRI calibration with phantom images: towards quantitative imaging
    Juhani Dabek
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, Aalto, Finland
    J Magn Reson 224:22-31. 2012
    ..The necessary theory is provided here with experimental verification. The calibration procedure opens the possibility of performing quantitative ULF MRI without sample-specific reference scans...
  9. doi request reprint Solving the problem of concomitant gradients in ultra-low-field MRI
    Jaakko O Nieminen
    Aalto University, Department of Biomedical Engineering and Computational Science, P O Box 12200, FI 00076 Aalto, Finland
    J Magn Reson 207:213-9. 2010
    ..With simulations, we show how the reconstruction errors of the methods depend on the strengths of the concomitant gradients. The proposed approach produces nearly distortion-free images even when the main field reaches zero...
  10. ncbi request reprint Current-density imaging using ultra-low-field MRI with zero-field encoding
    Panu T Vesanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P O Box 12200, FI 00076 Aalto, Finland Electronic address
    Magn Reson Imaging 32:766-70. 2014
    ..The performance of the method is evaluated by numerical simulations. The method may find applications, e.g., in noninvasive conductivity imaging of tissue. ..
  11. doi request reprint Polarization encoding as a novel approach to MRI
    Jaakko O Nieminen
    Helsinki University of Technology, Department of Biomedical Engineering and Computational Science, P O BOX 2200, FI 02015 TKK, Finland
    J Magn Reson 202:211-6. 2010
    ..The method may also prove useful for modalities that in the absence of any precession aim to image the DC magnetization profile of a sample...
  12. pmc TMS-evoked changes in brain-state dynamics quantified by using EEG data
    Tuomas Mutanen
    Department of Biomedical Engineering and Computational Science, Aalto University School of Science Espoo, Finland BioMag Laboratory, HUSLAB, Helsinki University Central Hospital Helsinki, Finland
    Front Hum Neurosci 7:155. 2013
    ..This indicates that the TMS-modulated brain state differs from the spontaneous one. Moreover, the TMS-modulated activity is more vigorous than the natural activity...