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Roger J. Ordidge
Researcher at University of Melbourne
Publications - 222
Citations - 9189
Roger J. Ordidge is an academic researcher from University of Melbourne. The author has contributed to research in topics: Magnetic resonance imaging & Imaging phantom. The author has an hindex of 52, co-authored 222 publications receiving 8764 citations. Previous affiliations of Roger J. Ordidge include University College London & Royal College of Surgeons in Ireland.
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Image-selected in Vivo spectroscopy (ISIS). A new technique for spatially selective nmr spectroscopy
TL;DR: In this article, a spatial localization method for in vivo spectroscopic investigation of biological and medical samples is described, which overcomes most of the technical problems associated with localized NMR spectroscopy and allows the spectrum to be investigated from a cube which can be positioned by reference to an NMR image.
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Correction of motional artifacts in diffusion-weighted MR images using navigator echoes.
Roger J. Ordidge,Joseph A. Helpern,Joseph A. Helpern,Z.X. Qing,Robert A. Knight,V. Nagesh,V. Nagesh +6 more
TL;DR: A modified pulse sequence is proposed which uses the phase information from an additional spin echo to correct for patient motion, and application is demonstrated for a human brain study, which greatly improves the quantification of diffusion values from regions of brain tissue.
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Assessment of relative brain iron concentrations using T2-weighted and T2*-weighted MRI at 3 Tesla.
Roger J. Ordidge,Jay M. Gorell,Jean C. Deniau,Jean C. Deniau,Robert A. Knight,Joseph A. Helpern,Joseph A. Helpern +6 more
TL;DR: In this paper a new method is presented for the relative assessment of brain iron concentrations based on the evaluation of T2 and T2* ‐weighted images, which allows the separation of global and local field inhomogeneities, leading to more accurate T 2* measurements and hence, T2′ values.
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Increased iron‐related MRI contrast in the substantia nigra in Parkinson's disease
TL;DR: Correlations with motor performance in PD suggest that the clinical severity of PD may be related to SN iron accumulation, and the increases in iron levels seen postmortem in the SN in PD are reflected in increased iron-related MRI contrast in living PD patients.
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High field MRI correlates of myelin content and axonal density in multiple sclerosis--a post-mortem study of the spinal cord.
J. P. Mottershead,Klaus Schmierer,M Clemence,John S. Thornton,Francesco Scaravilli,Gareth J. Barker,Ps Tofts,J. Newcombe,M. L. Cuzner,Roger J. Ordidge,W. I. McDonald,DH Miller +11 more
TL;DR: Evaluating the pathological substrate of high field MRI in post-mortem (PM) spinal cord of patients with MS found myelin content and axonal density correlated strongly with MTR, T1, PD, and diffusion anisotropy, but only moderately with T2 and weakly with the apparent diffusion coefficient.