Search results for: Y. Höller

Items from 1 to 20 out of 56 results

article

Transcranial magnetic stimulation studies in complex regional pain syndrome type I: A review

R. Nardone, F. Brigo, Y. Höller, L. Sebastianelli, more

Acta Neurologica Scandinavica > 137 > 2 > 158 - 164

The sensory and motor cortical representation corresponding to the affected limb is altered in patients with complex regional pain syndrome (CRPS). Transcranial magnetic stimulation (TMS) represents a useful non‐invasive approach for studying cortical physiology. If delivered repetitively, TMS can also modulate cortical excitability and induce long‐lasting neuroplastic changes. In this review, we...

article

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, more

The European Physical Journal C > 2017 > 77 > 6 > 1-23

Exclusive $$\rho ^0$$ ρ 0 -meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV $$^2<Q^2<$$ 2 < Q 2 < 7.0 GeV $$^2$$ 2 , 3.0 GeV $$<W<$$ < W < 6.3 GeV, and $$-t^\prime...

article

Measurement and tricubic interpolation of the magnetic field for the OLYMPUS experiment

J.C. Bernauer, J. Diefenbach, G. Elbakian, G. Gavrilov, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2016 > 823 > C > 9-14

The OLYMPUS experiment used a 0.3T toroidal magnetic spectrometer to measure the momenta of outgoing charged particles. In order to accurately determine particle trajectories, knowledge of the magnetic field was needed throughout the spectrometer volume. For that purpose, the magnetic field was measured at over 36,000 positions using a three-dimensional Hall probe actuated by a system of translation...

chapter

Variability Issues in Automated Hippocampal Segmentation: A Study on Out-of-the-Box Software and Multi-rater Ground Truth

M. Liedlgruber, K. Butz, Y. Holler, G. Kuchukhidze, more

2016 IEEE 29th International Symposium on Computer-Based Medical Systems (CBMS) > 191 - 196

2016 IEEE 29th International Symposium on Computer-Based Medical Systems (CBMS)

In automated hippocampus segmentation, issues related to ground truth rater variability, subject variability and variability of software segmentation accuracy are investigated in the context of 3 publicly available, out-of-the-box software packages. Ground truth variability among three manual raters is controlled using a majority voting based label fusion scheme and observed subject variability underpins...

article

ID 316 – EEG resting-state directed connectivity in temporal lobe epilepsy vs healthy controls

A. Coito, G. Plomp, E. Abela, G.R. Iannotti, more

Clinical Neurophysiology > 2016 > 127 > 3 > e86

Using high-density EEG, we investigated resting-state directed brain connectivity independent from interictal epileptiform discharges (IED) in left and right temporal lobe epilepsy (LTLE and RTLE) compared to healthy controls.Twenty LTLE, 20 RTLE patients and 20 healthy controls underwent a resting-state high-density EEG. Source activity free of IED was obtained for 82 regions of interest (ROI). Granger-causal...

article

Erratum to: Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

A. Airapetian, N. Akopov, Z. Akopov, W. Augustyniak, more

The European Physical Journal C > 2016 > 76 > 3 > 1-2

article

Epidemiology-Based Mortality Score in Status Epilepticus (EMSE)

M. Leitinger, Y. Höller, G. Kalss, A. Rohracher, more

Neurocritical Care > 2015 > 22 > 2 > 273-282

Background Status epilepticus (SE) is a neurological emergency with high mortality and often a poor functional outcome amongst survivors. So far, only status epilepticus severity score (STESS) is available to predict individual outcomes. STESS is based on weighted sum scores of age, type of seizure, level of consciousness and history of previous seizures. Weighting factors were based on a priori...

article

Bose–Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon

A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, more

The European Physical Journal C > 2015 > 75 > 8 > 1-9

Bose–Einstein correlations of like-sign charged hadrons produced in deep-inelastic electron and positron scattering are studied in the HERMES experiment using nuclear targets of $$^1$$ 1 H, $$^2$$ 2 H, $$^3$$ 3 He, $$^4$$ 4 He, N, Ne, Kr, and Xe. A Gaussian approach is used to parametrize a two-particle correlation function determined from events with at...

article

Transverse-target-spin asymmetry in exclusive $$\omega $$ ω -meson electroproduction

A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, more

The European Physical Journal C > 2015 > 75 > 12 > 1-8

Hard exclusive electroproduction of $$\omega $$ ω mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. The amplitudes of five azimuthal modulations of the single-spin asymmetry of the cross section with respect to the transverse proton polarization are measured. They are determined...

article

YIA3: Consistency over time of electroencephalographic connectivity measures in temporal lobe epilepsy

Y. Höller, K. Butz, A. Thomschewski, P. Höller, more

Clinical Neurophysiology > 2014 > 125 > Supplement 1 > S24-S25

article

P793: Consistency over time of electroencephalographic connectivity measures in temporal lobe epilepsy

Y. Höller, K. Butz, A. Thomschewski, P. Hoeller, more

Clinical Neurophysiology > 2014 > 125 > Supplement 1 > S254-S255

article

Transcranial magnetic stimulation (TMS)/repetitive TMS in mild cognitive impairment and Alzheimer's disease

R. Nardone, F. Tezzon, Y. Höller, S. Golaszewski, more

Acta Neurologica Scandinavica > 129 > 6 > 351 - 366

Several Transcranial Magnetic Stimulation (TMS) techniques can be applied to noninvasively measure cortical excitability and brain plasticity in humans. TMS has been used to assess neuroplastic changes in Alzheimer's disease (AD), corroborating findings that cortical physiology is altered in AD due to the underlying neurodegenerative process. In fact, many TMS studies have provided physiological evidence...

article

The OLYMPUS experiment

R. Milner, D.K. Hasell, M. Kohl, U. Schneekloth, more

Nuclear Inst. and Methods in Physics Research, A > 2014 > 741 > Complete > 1-17

The OLYMPUS experiment was designed to measure the ratio between the positron–proton and electron–proton elastic scattering cross-sections, with the goal of determining the contribution of two-photon exchange to the elastic cross-section. Two-photon exchange might resolve the discrepancy between measurements of the proton form factor ratio, μpGEp/GMp, made using polarization techniques and those made...

article

Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region

The HERMES collaboration, A. Airapetian, N. Akopov, E. C. Aschenauer, more

Journal of High Energy Physics > 2014 > 2014 > 1 > 1-17

Abstract The beam-helicity asymmetry in associated electroproduction of real photons, ep → eγπN , in the Δ(1232)-resonance region is measured using the longitudinally polarized Hera positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, ep → eγπ⁰ p and ep → eγπ⁺ n, from a data set collected with a recoil detector...

article

Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

The HERMES Collaboration, A. Airapetian, N. Akopov, Z. Akopov, more

The European Physical Journal C > 2014 > 74 > 11 > 1-25

Exclusive electroproduction of $$\omega $$ ω mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of $$Q^2> 1.0$$ Q 2 > 1.0 GeV $$^2$$ 2 , 3.0 GeV $$< W <$$ < W < 6.3 GeV, and $$-t'< 0.2$$ - t ′ < 0.2 GeV $$^2$$ 2 . Results on the angular distribution of the $$\omega $$...

article

Combining SPECT and EEG analysis for assessment of disorders with amnestic symptoms to enhance accuracy in early diagnostics

W. Staffen, Y. Höller, N. Strobl, H. Zauner, more

Journal of the Neurological Sciences > 2013 > 333 > Supplement 1 > e335

chapter

Improved endoscope distortion correction does not necessarily enhance mucosa-classification based medical decision support systems

M. Gschwandtner, J. Hammerle-Uhl, Y. Holler, M. Liedlgruber, more

2012 IEEE 14th International Workshop on Multimedia Signal Processing (MMSP) > 158 - 163

2012 IEEE 14th International Workshop on Multimedia Signal Processing (MMSP)

Distortion correction in two variants is applied to endoscopic duodenal imagery aiming at an improvement of automated classification of celiac disease affected mucosa patches. In a set of heterogeneous feature extraction techniques, only geometry and shape related ones are able to benefit from distortion correction, while for others, even a decrease of classification accuracy is observed. Different...

article

Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

The Hermes Collaboration, A. Airapetian, N. Akopov, Z. Akopov, more

Journal of High Energy Physics > 2012 > 2012 > 10 > 1-28

Abstract The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized Hera positron beam scattering off an unpolarized hydrogen target is measured at Hermes. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe-Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample...

article

Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton

The HERMES Collaboration, A. Airapetian, N. Akopov, Z. Akopov, more

Journal of High Energy Physics > 2012 > 2012 > 7 > 1-26

Abstract Beam-helicity and beam-charge asymmetries in the hard exclusive leptoproduction of real photons from an unpolarised hydrogen target by a 27.6 GeV lepton beam are extracted from the Hermes data set of 2006-2007 using a missing-mass event selection technique. The asymmetry amplitudes extracted from this data set are more precise than those extracted from the earlier data set of 1996-2005 previously...

article

Measurement of the virtual-photon asymmetry A ₂ and the spin-structure function g ₂ of the proton

The HERMES Collaboration, A. Airapetian, N. Akopov, Z. Akopov, more

The European Physical Journal C > 2012 > 72 > 3 > 1-7

A measurement of the virtual-photon asymmetry A ₂(x,Q ²) and of the spin-structure function g ₂(x,Q ²) of the proton are presented for the kinematic range 0.004<x<0.9 and 0.18 GeV²<Q ²<20 GeV². The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely...

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Search results for: Y. Höller

Transcranial magnetic stimulation studies in complex regional pain syndrome type I: A review

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Measurement and tricubic interpolation of the magnetic field for the OLYMPUS experiment

Variability Issues in Automated Hippocampal Segmentation: A Study on Out-of-the-Box Software and Multi-rater Ground Truth

ID 316 – EEG resting-state directed connectivity in temporal lobe epilepsy vs healthy controls

Erratum to: Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

Epidemiology-Based Mortality Score in Status Epilepticus (EMSE)

Bose–Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon

Transverse-target-spin asymmetry in exclusive $$\omega $$ ω -meson electroproduction

YIA3: Consistency over time of electroencephalographic connectivity measures in temporal lobe epilepsy

P793: Consistency over time of electroencephalographic connectivity measures in temporal lobe epilepsy

Transcranial magnetic stimulation (TMS)/repetitive TMS in mild cognitive impairment and Alzheimer's disease

The OLYMPUS experiment

Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region

Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

Combining SPECT and EEG analysis for assessment of disorders with amnestic symptoms to enhance accuracy in early diagnostics

Improved endoscope distortion correction does not necessarily enhance mucosa-classification based medical decision support systems

Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton

Measurement of the virtual-photon asymmetry A ₂ and the spin-structure function g ₂ of the proton

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