1. The Gamma Knife Centre at Queen Square, National Hospital for Neurology and Neurosurgery, London, UK
2. Department of Neurosurgery, Royal Victoria Infirmary, Newcastle upon Tyne, UK
3. Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
4. The Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, London, UK
5. Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
6. Institute of Nuclear Medicine, University College London Hospitals, London, UK
7. Centre for Medical Imaging, University College London, London, UK
8. Division of Radiology, Department of Diagnostic and Public Health, Verona University, Verona, Italy
9. School of Biomedical Engineering and Imaging Sciences, King’s College London, London, UK
10. C. J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands
11. MRI Group, Department of Medical Physics and Biomedical Engineering, University College London, London, UK
12. Academic Neuroradiological Unit, Department of Brain Repair and Rehabilitation, Institute of Neurology, University College London, London, UK