To the Editor

Condon B. Patterson J. Wyper D. Hadley D.M. Jenkins A. Rowan J. (1986a) Two correction techniques for image non-uniformity in MRI. Proceedings of the Second Congress of the European Society of Magnetic Resonance in Medicine and Biology Geneva, Switzerland, p. 41–51.

Condon B. Patterson J. Wyper D. Hadley D. Teasdale G. Grant R. Jenkins A. Macpherson P. Rowan J. (1986b) A quantitative index of ventricular and extraventricular CSF fluid volumes using MR imaging. J Comp Assist Tomogr 10:784–792.

Condon B. Patterson J. Wyper D.J. Hadley D.M. Grant R. Teasdale G. Rowan J. (1986c) Intracranial CSF volumes determined using magnetic resonance imaging. Lancet 8494: 1355–1357.

Herscovitch P. Auchus A.P. Gado M. Chi D. Raichle M.E. (1986) Correction of positron emission tomography data for cerebral atrophy. J Cereb Blood Flow Metab 6:120–124.

Wyper D.J. Pickard J.D. Matheson M. (1979) Accuracy of ventricular volume estimation. J Neurol Neurosurg Psychiat 42:345–350.