A5023125853- Face Recognition and Perception
- Advanced MRI Techniques and Applications
- Neural and Behavioral Psychology Studies
- Memory and Neural Mechanisms
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Action Observation and Synchronization
- Neurobiology of Language and Bilingualism
- Stroke Rehabilitation and Recovery
- Neural dynamics and brain function
- Advanced Neuroimaging Techniques and Applications
- Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
- Language, Metaphor, and Cognition
- Ultrasound and Hyperthermia Applications
- Psychology of Moral and Emotional Judgment
- Child and Animal Learning Development
- Multisensory perception and integration
- Functional Brain Connectivity Studies
- Cardiac Imaging and Diagnostics
- Virtual Reality Applications and Impacts
- Ultrasound Imaging and Elastography
- NMR spectroscopy and applications
- Wireless Body Area Networks
- Motor Control and Adaptation
- Radiomics and Machine Learning in Medical Imaging
German Center for Neurodegenerative Diseases
2023-2024
University of Bonn
2023-2024
Erwin L. Hahn Institute for Magnetic Resonance Imaging
2017-2019
University of Duisburg-Essen
2017-2019
Essen University Hospital
2017-2019
Resonance Research (United States)
2018
Mayo Clinic
2018
Ashland (United States)
2017
Maastricht University
2017
Brain Innovation (Netherlands)
2017
Abstract The R ehabilitation G aming S ystem ( RGS ) has been designed as a flexible, virtual‐reality VR )‐based device for rehabilitation of neurological patients. Recently, training visuomotor processing with the was shown to effectively improve arm function in acute and chronic stroke It is assumed that ‐based protocol related creates conditions aid recovery by virtue human mirror neuron system. Here, we provide evidence this assumption identifying brain areas involved controlling...
Purpose A 32-channel parallel transmit (pTx) add-on for 7 Tesla whole-body imaging is presented. First results are shown phantom and in-vivo imaging. Methods The system consists of a large number hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, control computer, an integrated transmit/receive body array. B1+ maps in as well structural images volunteers acquired to demonstrate the functionality system. EM simulations used ensure safe operation....
Aphantasia refers to reduced or absent visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth information about whether the loss imagery in aphantasics affects their AM retrieval. The hippocampus thought be crucial hub brain-wide network underlying AM. One important question this network, especially connectivity hippocampus, altered aphantasia. In current study, we tested 14 congenital...
The recognition of emotional facial expressions is an important means to adjust behavior in social interactions. As widely differ their duration and degree expressiveness, they often manifest with short transient below the level awareness. In this combined behavioral fMRI study, we aimed at examining whether or not consciously accessible (subliminal) influence empathic judgments which brain activations are related it. We hypothesized that subliminal emotions masked neutral same faces induce...
In this work, a combined body coil array with eight transmit/receive (Tx/Rx) meander elements and 24 receive-only (Rx) loops (8Tx/32Rx) was developed evaluated in comparison an 8-channel (8Tx/Rx) based on serving as the reference standard.Systematic evaluation of RF performed body-sized phantom. Body imaging at 7T six volunteers regions pelvis, abdomen, heart. Coil characteristics such signal-to-noise ratio, acceleration capability, g-factors, S-parameters, noise correlation, B1+ maps were...
Purpose Current methods for mitigation of transmit field inhomogeneities at ultrahigh (UHF) MRI by multi‐channel radiofrequency (RF) shimming rely on accurate mapping. This can be time consuming when many RF channels have to mapped in vivo body MRI, where the B 1 maps should ideally acquired within a single breath‐hold. Therefore, new mapping technique (B1TIAMO) is proposed. Methods The performance this validated against an established method (DREAM) phantom measurements cylindrical head...
The current study is a first exploration of real-time self-regulation functional magnetic resonance imaging (fMRI) activation based on several different visual neurofeedback presentations. Six healthy participants were engaged in regional fMRI the posterior parietal cortex (PPC), by performing mental calculation task. In MR sessions, feedback was presented form either thermometer display (in vertical orientation), circle (increasing or decreasing physical size), numbers (Arabic digits)....
Purpose To design and evaluate an 8/15‐channel transmit/receive (Tx/Rx) head‐neck RF coil combination with region‐specific shimming for whole‐brain MRI focus on improved functional of the cerebellum at 7 T. Methods An 8‐channel transceiver head was combined a 7‐channel receive‐only array. The noise parameters acceleration capabilities this 8Tx/15Rx setup were compared commercially available 1Tx/32Rx coil. Region‐specific applied when using capability cerebellum, temporal SNR statistical...
To evaluate the technical feasibility of high-resolution USPIO-enhanced magnetic resonance imaging pelvic lymph nodes (LNs) at ultrahigh field strength. The ethics review board approved this study and written informed consent was obtained from all patients. Three patients with rectal cancer three selected (recurrent) prostate were examined 7-T 24–36 h after intravenous ferumoxtran-10 administration; also received a 3-T MRI. Pelvic LN performed using TIAMO technique in combination...
Aphantasia prohibits people from experiencing visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth information about whether the loss imagery in aphantasics affects their AM retrieval. The hippocampus thought to be crucial hub brain-wide network underlying AM. One important question this network, especially connectivity hippocampus, altered aphantasia. In current study, we tested 14...
Purpose A 16‐channel receive (16Rx) radiofrequency (RF) array for 7T ultra‐high field body MR imaging is presented. The coil evaluated in conjunction with a transmit/receive (16TxRx) and additionally 32‐channel (32TxRx) remote RF transmit serving as references. Methods 16Rx consists of 16 octagonal overlapping loops connected to custom‐built detuning boards preamplifiers. Performance metrics like noise correlation, g‐factors, signal‐to‐noise ratio gain were compared between 4 different...
Abstract Aphantasia refers to reduced or absent visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth information about whether the loss imagery in aphantasics affects their AM retrieval. The hippocampus thought be crucial hub brain-wide network underlying AM. One important question this network, especially connectivity hippocampus, altered aphantasia. In current study, we tested 14...
Aphantasia refers to reduced or absent visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth information about whether the loss imagery in aphantasics affects their AM retrieval. The hippocampus thought be crucial hub brain-wide network underlying AM. One important question this network, especially connectivity hippocampus, altered aphantasia. In current study, we tested 14 congenital...
In this work, we present an 8-channel transceiver (Tx/Rx) 7-channel receive (Rx) radiofrequency (RF) coil setup for 7 T ultrahigh-field MR imaging of the shoulder.A C-shaped Tx/Rx was combined with anatomically close-fitting Rx-only coil. The safety and performance parameters were evaluated on bench in phantom experiments. shoulder RF vivo measurements using a 3D DESS, 2D PD-weighted TSE sequence, supervision based virtual observation points.Distinct SNR gain acceleration capabilities...
Socially-relevant decisions are based on clearly recognizable but also not consciously accessible affective stimuli. We studied the role of dorsolateral frontal cortex (DLFC) in decision-making masked affect expressions using functional magnetic resonance imaging. Our paradigm permitted us to capture brain activity during a pre-decision phase when subjects viewed emotional below threshold subjective awareness, and decision phase, which was verbal descriptions as choice criterion. Using...
<ns4:p>Socially-relevant decisions are based on clearly recognizable but also not consciously accessible affective stimuli. We studied the role of dorsolateral frontal cortex (DLFC) in decision-making masked affect expressions using functional magnetic resonance imaging. Our paradigm permitted us to capture brain activity during a pre-decision phase when subjects viewed emotional below threshold subjective awareness, and decision phase, which was verbal descriptions as choice criterion....
Aphantasia refers to reduced or absent visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth information about whether the loss imagery in aphantasics affects their AM retrieval. The hippocampus thought be crucial hub brain-wide network underlying AM. One important question this network, especially connectivity hippocampus, altered aphantasia. In current study, we tested 14 congenital...
Aims: The Rehabilitation Gaming System is an interactive computer simulation tool used to improve rehabilitation of motor deficits in stroke or other neurological patients. Based on a virtual reality RGS mimics the movements user by two arms avatar integrated environment. We assumed that combined observation, imagination and active execution induce neural reorganization fascilitate functional recovery.
2D gradient-echo EPI of the human brain suffers from signal loss artifacts caused by susceptibility-induced gradients perpendicular to slice plane. The problem is most pronounced near skull's air cavities and compromises BOLD fMRI studies in regions including orbito-frontal temporal cortex. spins across excited rectangular target profile are effectively dephased through-plane gradient GS,z as can be seen for two slices Fig 1 at 7 T. According expression on right (see 1) many methods exist...