Research Topics
| David W CarmichaelSummaryAffiliation: University College London Country: UK Publications
| Collaborators
|
Detail Information
Publications
Reducing ghosting due to k-space discontinuities in fast spin echo (FSE) imaging by a new combination of k-space ordering and parallel imagingDavid 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...
Functional MRI with active, fully implanted, deep brain stimulation systems: safety and experimental confoundsDavid 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...- An investigation of the relationship between BOLD and perfusion signal changes during epileptic generalised spike wave activityDavid 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... 
Feasibility of simultaneous intracranial EEG-fMRI in humans: a safety studyDavid 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...- Safety of localizing epilepsy monitoring intracranial electroencephalograph electrodes using MRI: radiofrequency-induced heatingDavid 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... - Epileptic networks in focal cortical dysplasia revealed using electroencephalography-functional magnetic resonance imagingRachel 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... - BOLD and perfusion changes during epileptic generalised spike wave activityKhalid 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... - Implementation and evaluation of simultaneous video-electroencephalography and functional magnetic resonance imagingUmair 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... - Looking for neuronal currents using MRI: an EEG-fMRI investigation of fast MR signal changes time-locked to frequent focal epileptic dischargesRoman Rodionov
Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, University College London, London, UK
Neuroimage 50:1109-17. 2010.... - Simultaneous intracranial EEG and fMRI of interictal epileptic discharges in humansSerge 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... - EEG correlated functional MRI and postoperative outcome in focal epilepsyRachel 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... - Common SENSE (sensitivity encoding using hardware common to all MR scanners): a new method for single-shot segmented echo planar imagingDavid 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... - Improving whole brain structural MRI at 4.7 Tesla using 4 irregularly shaped receiver coilsDavid 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... - Connectivity of the supplementary motor area in juvenile myoclonic epilepsy and frontal lobe epilepsySerge 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... - The effect of local perturbation fields on human DTI: characterisation, measurement and correctionSiawoosh 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... - Subpixel enhancement of nonuniform tissue (SPENT): a novel MRI technique for quantifying BMDMarios 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... - 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 infectionXiaolan 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... - 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...