Search Results - "Ordidge, R."

High field MRI correlates of myelin content and axonal density in multiple sclerosis: A post-mortem study of the spinal cord by MOTTERSHEAD, J. P, SCHMIERER, K, MCDONALD, W. I, MILLER, D. H, CLEMENCE, M, THORNTON, J. S, SCARAVILLI, F, BARKER, G. J, TOFTS, P. S, NEWCOMBE, J, CUZNER, M. L, ORDIDGE, R. J

“…Different MRI techniques are used to investigate multiple sclerosis (MS) in vivo. The pathological specificity of these techniques is poorly understood, in…”
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Increased iron-related MRI contrast in the substantia nigra in Parkinson's disease by GORELL, J. M, ORDIDGE, R. J, BROWN, G. G, DENIAU, J.-C, BUDERER, N. M, HELPERN, J.A

“…Elevated iron levels in the substantia nigra (SN) of the brain in Parkinson's disease (PD) may mediate lipid peroxidative reactions, promoting SN neuronal…”
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Frequency offset corrected inversion (FOCI) pulses for use in localized spectroscopy by Ordidge, R J, Wylezinska, M, Hugg, J W, Butterworth, E, Franconi, F

“…Gradient localized spectroscopy techniques suffer from a well documented spatial localization error caused by the difference in chemical shifts between…”
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High resolution MRI of the brain at 4.7 Tesla using fast spin echo imaging by DE VITA, E, THOMAS, D. L, ROBERTS, S, PARKES, H. G, TURNER, R, KINCHESH, P, SHMUELI, K, YOUSRY, T. A, ORDIDGE, R. J

“…Over recent years, high field MR scanners (3 T and above) have become increasingly widespread due to potential advantages such as higher signal-to-noise ratio…”
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Correction of motional artifacts in diffusion-weighted MR images using navigator echoes by Ordidge, R J, Helpern, J A, Qing, Z X, Knight, R A, Nagesh, V

“…Patient motion can seriously degrade the quality of diffusion-weighted MR images obtained using standard 2DFT imaging procedures. The main source of error…”
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The measurement of diffusion and perfusion in biological systems using magnetic resonance imaging by Thomas, D L, Lythgoe, M F, Pell, G S, Calamante, F, Ordidge, R J

“…The aim of this review is to describe two recent developments in the use of magnetic resonance imaging (MRI) in the study of biological systems: diffusion and…”
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Magnetic resonance imaging assessment of evolving focal cerebral ischemia. Comparison with histopathology in rats by Knight, R A, Dereski, M O, Helpern, J A, Ordidge, R J, Chopp, M

“…This study was performed to document the progression of ischemic brain damage after middle cerebral artery occlusion in the rat using magnetic resonance…”
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MRI measurements of cerebral deoxyhaemoglobin concentration [dHb]-correlation with near infrared spectroscopy (NIRS) by Punwani, S., Ordidge, R. J., Cooper, C. E., Amess, P., Clemence, M.

“…Changes in physiological parameters such as cerebral blood flow, cerebral blood volume, oxygen extraction, and the size and distribution of cerebral blood…”
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MR image-guided investigation of regional signal transducers and activators of transcription-1 activation in a rat model of focal cerebral ischemia by West, D.A, Valentim, L.M, Lythgoe, M.F, Stephanou, A, Proctor, E, van Der Weerd, L, Ordidge, R.J, Latchman, D.S, Gadian, D.G

“…Background and purpose: STAT-1 is a member of a family of proteins called signal transducers and activators of transcription (STATs), and recent studies have…”
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Pathological fracture of the radius secondary to an aneurysmal bone cyst in a horse by Ordidge, R.

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The development of echo-planar imaging (EPI): 1977-1982 by Ordidge, R

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Early changes in water diffusion, perfusion, T1, and T2 during focal cerebral ischemia in the rat studied at 8.5 T by Calamante, Fernando, Lythgoe, Mark F., Pell, Gaby S., Thomas, David L., King, Martin D., Busza, Albert L., Sotak, Christopher H., Williams, Stephen R., Ordidge, Roger J., Gadian, David G.

“…The time evolution of water diffusion, perfusion, T1, and T2 is investigated at high magnetic field (8.5 T) following permanent middle cerebral artery…”
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The development of echo-planar imaging (EPI): 1977–1982 by Ordidge, R

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Temporal evolution of ischemic damage in rat brain measured by proton nuclear magnetic resonance imaging by KNIGHT, R. A, ORDIDGE, R. J, HELPERN, J. A, CHOPP, M, RODOLOSI, L. C, PECK, D

“…We studied the effect of focal cerebral ischemia on the "state" of brain water using proton nuclear magnetic resonance imaging. Focal cerebral ischemia was…”
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Implementation of quantitative FAIR perfusion imaging with a short repetition time in time-course studies by Pell, Gaby S., Thomas, David L., Lythgoe, Mark F., Calamante, Fernando, Howseman, Alistair M., Gadian, David G., Ordidge, Roger J.

“…Flow‐sensitive alternating inversion recovery (FAIR) is a pulsed arterial spin labeling magnetic resonance imaging method for perfusion quantification. In its…”
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Temporal and anatomical variations of brain water apparent diffusion coefficient in perinatal cerebral hypoxic-ischemic injury: relationships to cerebral energy metabolism by Thornton, J S, Ordidge, R J, Penrice, J, Cady, E B, Amess, P N, Punwani, S, Clemence, M, Wyatt, J S

“…Cerebral apparent diffusion coefficients (ADCs) were determined in nine newborn piglets before and for 48 h after transient hypoxia-ischemia. Phosphorus MRS…”
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Removing the effects of CSF partial voluming on fitted CBF and arterial transit times using FAIR, a pulsed arterial spin labelling technique by Wiersma, J, Deichmann, R, Ordidge, R, Turner, R

“…FAIR, an arterial spin labelling technique, provides non-invasive, quantitative CBF values and arterial transit times deltat. This paper focuses on the…”
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In vivo MRI measurements of bone quality in the calcaneus : A comparison with DXA and ultrasound by KANG, C, PALEY, M, ORDIDGE, R, SPELLER, R

“…Magnetic resonance imaging (MRI) has shown promise in the assessment of bone architecture. The precision and feasibility of MRI measurements in osteoporosis in…”
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Anisotropic water diffusion in white and gray matter of the neonatal piglet brain before and after transient hypoxia-ischaemia by Thornton, J.S., Ordidge, R.J., Penrice, J., Cady, E.B., Amess, P.N., Punwani, S., Clemence, M., Wyatt, J.S.

“…Measurements of tissue water apparent diffusion coefficient (ADC) performed with diffusion sensitization applied separately along the x, y, and z axes revealed…”
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High-speed multislice T1 mapping using inversion-recovery echo-planar imaging by Ordidge, R J, Gibbs, P, Chapman, B, Stehling, M K, Mansfield, P

“…Tissue contrast in MR images is a strong function of spin-lattice (T1) and spin-spin (T2) relaxation times. However, the T1 relaxation time is rarely…”
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