Kǎmil Uǧurbil

10.5 Tesla High-Resolution Macaque Brain MRI for In vivo and Ex vivo Connectivity Studies

This paper presents high-resolution diffusion MRI techniques for in vivo and ex vivo macaque brain imaging at 10.5 Tesla, enabling detailed connectivity studies.

An 80-channel receive array for 10.5T neuroimaging: Key considerations for SNR optimization

This paper develops an 80-channel receive array for 10.5T MRI to optimize SNR and parallel imaging by addressing parasitic losses and design improvements.

SNR Enhancement Considerations for Loop Receive Coils at Ultra-High Fields

This study quantifies parasitic losses in UHF MRI receive coils and shows how they reduce predicted SNR, providing guidance for improving coil design.

An RF coil array system for in vivo & ex vivo non-human primate brain studies at 10.5 Tesla

The paper develops an RF coil array system for high-resolution in vivo and ex vivo non-human primate brain imaging at 10.5 Tesla, achieving improved spatial resolution and imaging capabilities.

A retinotopic wiring principle of the human brain

The paper shows that structural connectivity in the human visual cortex preserves retinotopic organization, revealing a retinotopic wiring principle and systematic perceptual asymmetries in early visual cortex connectivity.

Functional MRI of the Human Hippocampus at 10.5T: Pushing the Boundaries of Spatial Resolution

This paper uses 10.5T fMRI to achieve 0.5 mm isotropic resolution, enabling detailed study of hippocampal function and high-precision clinical applications.

Bridging the gap with invasive imaging: promises and challenges of a new generation of ultrahigh resolution fMRI

This paper explores the potential and challenges of ultrahigh resolution fMRI at 10.5 Tesla to study cortical layers with improved resolution compared to standard methods.

Mesoscopic whole-brain T2*-weighted and associated quantitative MRI in healthy humans at 10.5 T

This paper demonstrates the feasibility of mesoscopic whole-brain T2*-weighted MRI at 10.5 T using advanced coils and motion-robust sequences, showing improved SNR and quantification precision compared to 7 T.

A Numerical Alternative to MR Thermometry for Safety Validation of Multi-Channel RF Transmit Coils

The paper introduces a numerical method to quantify SAR prediction errors for MRI safety validation, avoiding the need for MR thermometry.

Diffusion-weighted steady-state free precession imaging in the ex vivo macaque brain on a 10.5T human MRI scanner

This paper evaluates the diffusion-weighted steady-state free precession (DW-SSFP) sequence for ex vivo macaque brain imaging at 10.5T, showing improved SNR efficiency and geometric distortion reduction.

Denoising complex-valued diffusion MR images using a two-step non-local principal component analysis approach

This paper introduces a two-step non-local PCA method for denoising diffusion MRI with few diffusion directions, improving image quality and DTI metric estimation.

Spanning spatial scales with functional imaging in the human brain; initial experiences at 10.5 Tesla

This paper presents initial results of 10.5 Tesla fMRI in humans, showing improved spatial resolution and functional contrast compared to 7 Tesla.

Multi-echo Acquisition and Thermal Denoising Advances Precision Functional Imaging

This paper introduces multi-echo acquisition and thermal denoising methods to improve precision functional MRI in adults, children, and newborns, showing increased signal-to-noise ratio and reliability.

A 128-channel receive array with enhanced SNR performance for 10.5 tesla brain imaging

The paper develops a 128-channel receive array for 10.5T brain imaging, showing SNR gains and plateau effects in central regions.

RF coil design strategies for improving SNR at the ultrahigh magnetic field of 10.5 Tesla

The paper develops a high-channel-count RF coil array for 10.5T MRI, achieving high SNR and demonstrating high-resolution brain imaging at this field strength.

Mapping polarization-sensitive optical coherence tomography and ultra-high-field diffusion MRI in the macaque brain

The paper compares microstructure and fiber orientation measurements from polarization-sensitive OCT and ultra-high-field dMRI in macaque brains and demonstrates a GAN for improving MRI resolution using OCT data.

Denoising Diffusion MRI: Considerations and implications for analysis

This paper evaluates dMRI denoising methods by defining performance criteria and comparing patch-based algorithms in complex and magnitude domains.

Characterizing top-down microcircuitry of complex human behavior across different levels of the visual hierarchy

The paper uses ultra-high field fMRI to study task-related top-down modulations in human visual areas across cortical layers, finding layer-specific patterns in V1 and FFA.

Statistical Power or More Precise Insights into Neuro-Temporal Dynamics? Assessing the Benefits of Rapid Temporal Sampling in fMRI

This review evaluates the benefits of rapid temporal sampling in fMRI, showing it can reveal previously undetected neuro-temporal dynamics and improve spatial precision.

Lowering the Thermal Noise Barrier in Functional Brain Mapping with Magnetic Resonance Imaging

This paper introduces a novel fMRI denoising technique that improves temporal-SNR and functional map detection without altering signal amplitudes or spatial precision.

NORDIC Increases the Sensitivity and Preserves the Spatiotemporal Precision of fMRI Responses

The paper evaluates the NORDIC method for reducing thermal noise in fMRI data, showing it improves sensitivity and preserves spatiotemporal precision without significant loss of temporal information.

Clarifying the role of higher-level cortices in resolving perceptual ambiguity using ultra high field fMRI

This study uses ultra-high field fMRI to show that higher-level cortices modulate perceptual ambiguity and that the right inferior-temporal lobe encodes trial-by-trial variability in face perception.

NOise Reduction with DIstribution Corrected (NORDIC) PCA in dMRI with complex-valued parameter-free locally low-rank processing

This paper introduces NORDIC, a denoising framework for dMRI that improves SNR and fiber resolution, outperforming existing methods in simulations and human connectome data.

TDM: a temporal decomposition method for removing venous effects from task-based fMRI

This paper introduces TDM, a method to remove venous effects from task-based fMRI by decomposing responses into microvascular and macrovascular components, improving spatial accuracy.

Ultra-high field (10.5 T) resting state fMRI in the macaque

This paper demonstrates ultra-high field (10.5 T) resting state fMRI in macaques, revealing detailed and robust resting state components similar to human connectomes.

Multivoxel Pattern of Blood Oxygen Level Dependent Activity can be sensitive to stimulus specific fine scale responses

The paper evaluates the spatial precision of stimulus-specific BOLD responses using MVPA across cortical depths in V1, finding that multivoxel patterns can achieve sub-millimeter resolution.

A critical assessment of data quality and venous effects in ultra-high-resolution fMRI

This study evaluates ultra-high-resolution fMRI's ability to capture fine-scale BOLD activity, identifies venous effects as a confounding factor, and provides practical recommendations for data interpretation.

The HCP 7T Retinotopy Dataset: Description and pRF Analysis

The paper describes a large-scale retinotopy dataset from the HCP and presents population receptive field analysis results from both individual subjects and group averages.

Temporal Multivariate Pattern Analysis (tMVPA): a single trial approach exploring the temporal dynamics of the BOLD signal

This paper introduces tMVPA, a method to analyze temporal dynamics of the BOLD signal in fMRI data using single-trial analysis and sliding windows, showing it can detect time-specific patterns with controlled error rates.

Spatial specificity of the functional MRI blood oxygenation response relative to neuronal activity

The paper estimates the spatial specificity of BOLD fMRI responses using ocular dominance columns, finding PSF full-widths at half-maximum of 0.82 mm (SE) and 1.02 mm (GE).