Published in Journal of neuroscience methods
Conventionally used matrix sizes (PI-factors) might be non-optimal for some applications sacrificing BOLD spatial specificity. We recommend using the proposed high-resolution protocols applicable in detecting robust BOLD activation in fMRI.
Published in Magnetic resonance imaging
Perfusion-based changes in MR signal intensity can occur in response to the introduction of exogenous contrast agents and endogenous tissue properties (e.g. blood oxygenation). MR measurements aimed at capturing these changes often implement single-shot echo planar imaging (ssEPI). In recent years ssEPI readouts have been combined with parallel ima...
Published in Journal of Cardiovascular Magnetic Resonance
BackgroundThe standard clinical acquisition for left ventricular functional parameter analysis with cardiovascular magnetic resonance (CMR) uses a multi-breathhold multi-slice segmented balanced SSFP sequence. Performing multiple long breathholds in quick succession for ventricular coverage in the short-axis orientation can lead to fatigue and is c...
Published in NeuroImage
•Correlated coil spatial information causes spatial blurring in InI.•Blipped InI employs gradient blips in the partition encoding direction.•The extra spatial encoding results in higher spatial resolution.•The scan time remains the same.•The benefits of bInI were demonstrated in simulation and experimental results.
Published in Quantitative imaging in medicine and surgery
This paper presents a quantitative approach to evaluating and optimizing parallel imaging reconstruction for a clinical requirement. By introducing a "modulation domain representation" for undersampled data, the presented approach decomposes parallel imaging reconstruction error into multiple error components that can be grouped into three categori...
Published in Magnetic Resonance Materials in Physics, Biology and Medicine
Object Implementation of an accelerated Magnetization Prepared RApid Gradient Echo (MP-RAGE) sequence for T1 weighted neuroimaging; exploiting modern MRI technologies to minimize scan time while preserving the image quality.Materials and methodsA custom MP-RAGE sequence was implemented on a state-of-the-art 3T MR scanner equipped with a 32-channel ...
Published in Journal of Cardiovascular Magnetic Resonance
BackgroundMyocardial arterial spin labeling (ASL) is a noninvasive MRI based technique that is capable of measuring myocardial blood flow (MBF) in humans. It suffers from poor sensitivity to MBF due to high physiological noise (PN). This study aims to determine if the sensitivity of myocardial ASL to MBF can be improved by reducing image acquisitio...
Published in Magnetic Resonance Imaging
Parallel imaging methods allow to increase the acquisition rate via subsampled acquisitions of the k-space. SENSE and GRAPPA are the most popular reconstruction methods proposed in order to suppress the artifacts created by this subsampling. The reconstruction process carried out by both methods yields to a variance of noise value which is dependen...
Published in Quantitative MRI of the Spinal Cord
Radiofrequency receive-only coil arrays consist of a spatial arrangement of several small surface coil elements that record the magnetic resonance signal independently. This provides two major benefits: first, the sensitivity local to an individual element is increased due to the close coupling between the detector and tissue, thereby increasing th...
Published in Magnetic resonance imaging
Accuracy of interpolation coefficients fitting to the auto-calibrating signal data is crucial for k-space-based parallel reconstruction. Both conventional generalized autocalibrating partially parallel acquisitions (GRAPPA) reconstruction that utilizes linear interpolation function and nonlinear GRAPPA (NLGRAPPA) reconstruction with polynomial kern...
