Index by author
Repovic, P.
- EDITOR'S CHOICEAdult BrainOpen AccessIron-Insensitive Quantitative Assessment of Subcortical Gray Matter Demyelination in Multiple Sclerosis Using the Macromolecular Proton FractionV.L. Yarnykh, E.P. Krutenkova, G. Aitmagambetova, P. Repovic, A. Mayadev, P. Qian, L.K. Jung Henson, B. Gangadharan and J.D. BowenAmerican Journal of Neuroradiology April 2018, 39 (4) 618-625; DOI: https://doi.org/10.3174/ajnr.A5542
Fast macromolecular proton fraction mapping is a recent quantitative MR imaging method for myelin assessment. Macromolecular proton fraction and T2* maps were obtained from 12 healthy controls, 18 patients with relapsing-remitting MS, and 12 patients with secondary-progressive MS using 3T MR imaging. The macromolecular proton fraction in all subcortical structures and T2* in the globus pallidus, putamen, and caudate nucleus demonstrated a significant monotonic decrease from controls to patients with relapsing-remitting MS and from those with relapsing-remitting MS to patients with secondary-progressive MS. The macromolecular proton fraction in all subcortical structures significantly correlated with the Expanded Disability Status Scale and MS Functional Composite scores and provides an iron-insensitive measure of demyelination.
Riedel, C.
- Adult BrainYou have accessQuantitative Phase-Contrast MR Angiography to Measure Hemodynamic Changes in Idiopathic Intracranial HypertensionJ. Juhász, T. Lindner, C. Riedel, N.G. Margraf, O. Jansen and A. RohrAmerican Journal of Neuroradiology April 2018, 39 (4) 682-686; DOI: https://doi.org/10.3174/ajnr.A5571
Rinkel, G.J.E.
- EDITOR'S CHOICEADULT BRAINOpen AccessQuantification of Intracranial Aneurysm Volume Pulsation with 7T MRIR. Kleinloog, J.J.M. Zwanenburg, B. Schermers, E. Krikken, Y.M. Ruigrok, P.R. Luijten, F. Visser, L. Regli, G.J.E. Rinkel and B.H. VerweijAmerican Journal of Neuroradiology April 2018, 39 (4) 713-719; DOI: https://doi.org/10.3174/ajnr.A5546
Tenunruptured aneurysms in 9 patients were studied using a high-resolution 3D gradient-echo sequence with cardiac gating. Semiautomatic segmentation was used to measure aneurysm volume per cardiac phase. Aneurysm pulsation was defined as the relative increase in volume between the phase with the smallest volume and the phase with the largest volume. The accuracy and precision of the measured volume pulsations were addressed by digital phantom simulations and a repeat image analysis. In Stage II, the imaging protocol was optimized and 9 patients with 9 aneurysms were studied with and without administration of a contrast agent. Mean aneurysm pulsation in Stage I was 8%, with a mean volume change of 15 mm3. The artifactual volume pulsations measured with the digital phantom simulations were of the same magnitude as the volume pulsations observed in the patient data. Volume pulsation quantification with the current imaging protocol on 7T MR imaging is not accurate due to multiple imaging artifacts.
Rohr, A.
- Adult BrainYou have accessQuantitative Phase-Contrast MR Angiography to Measure Hemodynamic Changes in Idiopathic Intracranial HypertensionJ. Juhász, T. Lindner, C. Riedel, N.G. Margraf, O. Jansen and A. RohrAmerican Journal of Neuroradiology April 2018, 39 (4) 682-686; DOI: https://doi.org/10.3174/ajnr.A5571
Rooney, W.
- Adult BrainOpen AccessAn Automated Statistical Technique for Counting Distinct Multiple Sclerosis LesionsJ.D. Dworkin, K.A. Linn, I. Oguz, G.M. Fleishman, R. Bakshi, G. Nair, P.A. Calabresi, R.G. Henry, J. Oh, N. Papinutto, D. Pelletier, W. Rooney, W. Stern, N.L. Sicotte, D.S. Reich and R.T. Shinohara the North American Imaging in Multiple Sclerosis CooperativeAmerican Journal of Neuroradiology April 2018, 39 (4) 626-633; DOI: https://doi.org/10.3174/ajnr.A5556
Rose, W.
- Adult BrainYou have accessBrain Imaging in Cases with Positive Serology for Dengue with Neurologic Symptoms: A Clinicoradiologic CorrelationH.A. Vanjare, P. Mannam, A.K. Mishra, R. Karuppusami, R.A.B. Carey, A.M. Abraham, W. Rose, R. Iyyadurai and S. ManiAmerican Journal of Neuroradiology April 2018, 39 (4) 699-703; DOI: https://doi.org/10.3174/ajnr.A5544
Rudin, S.
- NeurointerventionOpen AccessA Patient Dose-Reduction Technique for Neuroendovascular Image-Guided Interventions: Image-Quality Comparison StudyA. Sonig, S.V. Setlur Nagesh, V.S. Fennell, S. Gandhi, L. Rangel-Castilla, C.N. Ionita, K.V. Snyder, L.N. Hopkins, D.R. Bednarek, S. Rudin, A.H. Siddiqui and E.I. LevyAmerican Journal of Neuroradiology April 2018, 39 (4) 734-741; DOI: https://doi.org/10.3174/ajnr.A5552
Ruigrok, Y.M.
- EDITOR'S CHOICEADULT BRAINOpen AccessQuantification of Intracranial Aneurysm Volume Pulsation with 7T MRIR. Kleinloog, J.J.M. Zwanenburg, B. Schermers, E. Krikken, Y.M. Ruigrok, P.R. Luijten, F. Visser, L. Regli, G.J.E. Rinkel and B.H. VerweijAmerican Journal of Neuroradiology April 2018, 39 (4) 713-719; DOI: https://doi.org/10.3174/ajnr.A5546
Tenunruptured aneurysms in 9 patients were studied using a high-resolution 3D gradient-echo sequence with cardiac gating. Semiautomatic segmentation was used to measure aneurysm volume per cardiac phase. Aneurysm pulsation was defined as the relative increase in volume between the phase with the smallest volume and the phase with the largest volume. The accuracy and precision of the measured volume pulsations were addressed by digital phantom simulations and a repeat image analysis. In Stage II, the imaging protocol was optimized and 9 patients with 9 aneurysms were studied with and without administration of a contrast agent. Mean aneurysm pulsation in Stage I was 8%, with a mean volume change of 15 mm3. The artifactual volume pulsations measured with the digital phantom simulations were of the same magnitude as the volume pulsations observed in the patient data. Volume pulsation quantification with the current imaging protocol on 7T MR imaging is not accurate due to multiple imaging artifacts.
Sacktor, N.
- Adult BrainOpen Access7T Brain MRS in HIV Infection: Correlation with Cognitive Impairment and Performance on Neuropsychological TestsM. Mohamed, P.B. Barker, R.L. Skolasky and N. SacktorAmerican Journal of Neuroradiology April 2018, 39 (4) 704-712; DOI: https://doi.org/10.3174/ajnr.A5547
Schermers, B.
- EDITOR'S CHOICEADULT BRAINOpen AccessQuantification of Intracranial Aneurysm Volume Pulsation with 7T MRIR. Kleinloog, J.J.M. Zwanenburg, B. Schermers, E. Krikken, Y.M. Ruigrok, P.R. Luijten, F. Visser, L. Regli, G.J.E. Rinkel and B.H. VerweijAmerican Journal of Neuroradiology April 2018, 39 (4) 713-719; DOI: https://doi.org/10.3174/ajnr.A5546
Tenunruptured aneurysms in 9 patients were studied using a high-resolution 3D gradient-echo sequence with cardiac gating. Semiautomatic segmentation was used to measure aneurysm volume per cardiac phase. Aneurysm pulsation was defined as the relative increase in volume between the phase with the smallest volume and the phase with the largest volume. The accuracy and precision of the measured volume pulsations were addressed by digital phantom simulations and a repeat image analysis. In Stage II, the imaging protocol was optimized and 9 patients with 9 aneurysms were studied with and without administration of a contrast agent. Mean aneurysm pulsation in Stage I was 8%, with a mean volume change of 15 mm3. The artifactual volume pulsations measured with the digital phantom simulations were of the same magnitude as the volume pulsations observed in the patient data. Volume pulsation quantification with the current imaging protocol on 7T MR imaging is not accurate due to multiple imaging artifacts.
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