David W Carmichael

Summary

Affiliation: University College London
Country: UK

Publications

  1. doi request reprint Feasibility of simultaneous intracranial EEG-fMRI in humans: a safety study
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, 12 Queen Square, London, UK
    Neuroimage 49:379-90. 2010
  2. pmc Reducing ghosting due to k-space discontinuities in fast spin echo (FSE) imaging by a new combination of k-space ordering and parallel imaging
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, UK
    J Magn Reson 200:119-25. 2009
  3. pmc Safety of localizing epilepsy monitoring intracranial electroencephalograph electrodes using MRI: radiofrequency-induced heating
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, and Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
    J Magn Reson Imaging 28:1233-44. 2008
  4. ncbi request reprint Functional MRI with active, fully implanted, deep brain stimulation systems: safety and experimental confounds
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, London, UK
    Neuroimage 37:508-17. 2007
  5. pmc An investigation of the relationship between BOLD and perfusion signal changes during epileptic generalised spike wave activity
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
    Magn Reson Imaging 26:870-3. 2008
  6. ncbi request reprint Imaging the interaction: epileptic discharges, working memory, and behavior
    Umair J Chaudhary
    DCEE, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, United Kingdom MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0RJ, United Kingdom
    Hum Brain Mapp 34:2910-7. 2013
  7. pmc Epileptic networks in focal cortical dysplasia revealed using electroencephalography-functional magnetic resonance imaging
    Rachel Thornton
    Department of Clinical and Experimental Epilepsy, University College London Institute of Neurology, London, United Kingdom
    Ann Neurol 70:822-37. 2011
  8. ncbi request reprint BOLD and perfusion changes during epileptic generalised spike wave activity
    Khalid Hamandi
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
    Neuroimage 39:608-18. 2008
  9. doi request reprint Implementation and evaluation of simultaneous video-electroencephalography and functional magnetic resonance imaging
    Umair J Chaudhary
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, Queen Square, London, UK
    Magn Reson Imaging 28:1192-9. 2010
  10. doi request reprint Looking for neuronal currents using MRI: an EEG-fMRI investigation of fast MR signal changes time-locked to frequent focal epileptic discharges
    Roman Rodionov
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, London, UK
    Neuroimage 50:1109-17. 2010

Collaborators

Detail Information

Publications20

  1. doi request reprint Feasibility of simultaneous intracranial EEG-fMRI in humans: a safety study
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, 12 Queen Square, London, UK
    Neuroimage 49:379-90. 2010
    ..08 mA) and charge density (0.2 microC/cm(2)) were well within safety limits (0.5 mA and 30 microC/cm(2), respectively). Site-specific testing and a conservative approach to safety are required to avoid the risk of adverse events...
  2. pmc Reducing ghosting due to k-space discontinuities in fast spin echo (FSE) imaging by a new combination of k-space ordering and parallel imaging
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, UK
    J Magn Reson 200:119-25. 2009
    ..By combining this data, a significant reduction in ghosting can be achieved. We show this approach to be effective through simulated and acquired MRI data...
  3. pmc Safety of localizing epilepsy monitoring intracranial electroencephalograph electrodes using MRI: radiofrequency-induced heating
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, and Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
    J Magn Reson Imaging 28:1233-44. 2008
    ..To investigate heating during postimplantation localization of intracranial electroencephalograph (EEG) electrodes by MRI...
  4. ncbi request reprint Functional MRI with active, fully implanted, deep brain stimulation systems: safety and experimental confounds
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, London, UK
    Neuroimage 37:508-17. 2007
    ..Further studies are required to determine the safety of MRI with DBS for other MRI systems, transmit coil configurations and DBS arrangements...
  5. pmc An investigation of the relationship between BOLD and perfusion signal changes during epileptic generalised spike wave activity
    David W Carmichael
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
    Magn Reson Imaging 26:870-3. 2008
    ..There was not a significant difference between Delta CBF/Delta BOLD during GSW, suggesting that neurovascular coupling to BOLD signal is generally maintained between states and, in particular, within areas of NBR...
  6. ncbi request reprint Imaging the interaction: epileptic discharges, working memory, and behavior
    Umair J Chaudhary
    DCEE, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, United Kingdom MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0RJ, United Kingdom
    Hum Brain Mapp 34:2910-7. 2013
    ..These findings suggest that generalized epileptiform discharges during a high demanding working memory task may change the working memory-related hemodynamic responses in frontal-lobe-network...
  7. pmc Epileptic networks in focal cortical dysplasia revealed using electroencephalography-functional magnetic resonance imaging
    Rachel Thornton
    Department of Clinical and Experimental Epilepsy, University College London Institute of Neurology, London, United Kingdom
    Ann Neurol 70:822-37. 2011
    ..We assessed the value of EEG-fMRI in patients with FCD-associated focal epilepsy by examining the relationship between IED-related hemodynamic changes, icEEG findings, and postoperative outcome...
  8. ncbi request reprint BOLD and perfusion changes during epileptic generalised spike wave activity
    Khalid Hamandi
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
    Neuroimage 39:608-18. 2008
    ..Cortical activations appear to reflect areas of discharge generation whilst deactivations reflect changes in conscious resting state activity...
  9. doi request reprint Implementation and evaluation of simultaneous video-electroencephalography and functional magnetic resonance imaging
    Umair J Chaudhary
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, Queen Square, London, UK
    Magn Reson Imaging 28:1192-9. 2010
    ..We conclude that video-EEG-fMRI set up can be implemented without affecting the data quality significantly and may provide valuable information on behaviour to enhance the analysis of fMRI data...
  10. doi request reprint Looking for neuronal currents using MRI: an EEG-fMRI investigation of fast MR signal changes time-locked to frequent focal epileptic discharges
    Roman Rodionov
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, London, UK
    Neuroimage 50:1109-17. 2010
    ....
  11. ncbi request reprint Improving whole brain structural MRI at 4.7 Tesla using 4 irregularly shaped receiver coils
    David W Carmichael
    Wellcome Trust High Field Laboratory, Department of Medical Physics and Bioengineering, University College London, 12 Queen Square, London, WC1N 6BG, UK
    Neuroimage 32:1176-84. 2006
    ..0 to 26.2 in central regions and 19.9 to 34.8 in cortical areas. Such images easily demonstrate cortical myeloarchitecture, while still covering most of the brain in a approximately 12 min scan...
  12. ncbi request reprint Common SENSE (sensitivity encoding using hardware common to all MR scanners): a new method for single-shot segmented echo planar imaging
    David W Carmichael
    University College London, Department of Medical Physics and Bioengineering, London, United Kingdom
    Magn Reson Med 54:402-10. 2005
    ..The main advantages are a reduction in distortion and blurring. Common SENSE is compatible with parallel imaging and partial Fourier methods...
  13. doi request reprint Simultaneous intracranial EEG and fMRI of interictal epileptic discharges in humans
    Serge Vulliemoz
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, UK
    Neuroimage 54:182-90. 2011
    ..Hence, icEEG-fMRI allows the study of whole-brain human epileptic networks with unprecedented sensitivity and specificity. This could help improve our understanding of epileptic networks with possible implications for epilepsy surgery...
  14. doi request reprint EEG correlated functional MRI and postoperative outcome in focal epilepsy
    Rachel Thornton
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, UK
    J Neurol Neurosurg Psychiatry 81:922-7. 2010
    ..The value of EEG-fMRI was assessed in patients with focal epilepsy who subsequently underwent epilepsy surgery, and IED correlated fMRI signal changes were related to the resection area and clinical outcome...
  15. doi request reprint Generalized spike and waves: effect of discharge duration on brain networks as revealed by BOLD fMRI
    Matteo Pugnaghi
    Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, Queen Square, London, WC1N 3BG, UK
    Brain Topogr 27:123-37. 2014
    ..These findings support the idea that the amplitude of the BOLD changes is linearly related to the GSWD duration with no universal threshold effect of spike and wave duration on the brain network supporting this activity. ..
  16. doi request reprint Connectivity of the supplementary motor area in juvenile myoclonic epilepsy and frontal lobe epilepsy
    Serge Vulliemoz
    National Society for Epilepsy MRI unit, Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, Queen Square, London, United Kingdom
    Epilepsia 52:507-14. 2011
    ..Moreover, motor networks are dysfunctional in juvenile myoclonic epilepsy (JME). We tested the hypothesis that SMA structural connectivity is altered in focal frontal lobe epilepsy (FLE) and JME compared to healthy controls...
  17. pmc The effect of local perturbation fields on human DTI: characterisation, measurement and correction
    Siawoosh Mohammadi
    Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, University College London, London, UK
    Neuroimage 60:562-70. 2012
    ..We demonstrate the importance of the proposed correction by showing improved consistency across scanners, different head positions and an increased FA contrast between grey and white matter...
  18. doi request reprint Subpixel enhancement of nonuniform tissue (SPENT): a novel MRI technique for quantifying BMD
    Marios C Yiannakas
    Department of Radiography, City University, London, United Kingdom
    J Bone Miner Res 24:324-33. 2009
    ..95, p < 0.001). The results suggest that the SPENT technique can provide a noninvasive measure of BMD at resolution and SNR levels achievable in vivo...
  19. ncbi request reprint Greater hypoxia-induced cell death in prenatal brain after bacterial-endotoxin pretreatment is not because of enhanced cerebral energy depletion: a chicken embryo model of the intrapartum response to hypoxia and infection
    Xiaolan Wang
    Centre for Perinatal Brain Research, The Institute for Women s Health, University College London, London, UK
    J Cereb Blood Flow Metab 28:948-60. 2008
    ..The damage-enhancing effects of LPS are not because of additional energy depletion but because of a synergistic toxic component...
  20. ncbi request reprint Method for spatially interleaving two images to halve EPI readout times: two reduced acquisitions interleaved (TRAIL)
    Andrew N Priest
    Department of Medical Physics and Bioengineering, University College London Hospitals NHS Trust, London, UK
    Magn Reson Med 51:1212-22. 2004
    ..For even further improvements, the technique can be combined with partial Fourier or parallel imaging...