Bold-Independent Computational Entropy Assesses Functional Donut-Like Structures in Brain fMRI Images

Bold-Independent Computational Entropy Assesses Functional Donut-Like Structures in Brain fMRI Images

We introduce a novel method for the measurement of information level in fMRI (functional Magnetic Resonance Imaging) neural data sets, based on image subdivision in small polygons equipped with different entropic content. We show how this method, called maximal nucleus clustering (MNC), is a novel, fast and inexpensive image-analysis technique, independent from the standard blood-oxygen-level d...

Our Thoughts Follow a Donut-like Trajectory in Brain

Brain Entropy Mapping Using fMRI

Entropy is an important trait for life as well as the human brain. Characterizing brain entropy (BEN) may provide an informative tool to assess brain states and brain functions. Yet little is known about the distribution and regional organization of BEN in normal brain. The purpose of this study was to examine the whole brain entropy patterns using a large cohort of normal subjects. A series of...

Improved combination of spiral-in/out images for BOLD fMRI.

Acquisitions with the spiral-in/out technique result in two separate image timeseries obtained during the spiral-in and spiral-out trajectory. In uniform brain regions the two components have comparable signal and BOLD contrast and can be averaged, but in regions compromised by susceptibility effects where both signal and noise can differ in the two images other combination methods may be more ...

Mapping functional changes in rat brain in response to altered serotonergic function using BOLD fMRI

Introduction Dysfunction in the brain serotonergic (5-HT) system is thought to underlie human depression. Selective Serotonin Re-uptake Inhibitors (SSRIs) are widely used antidepressant drugs whose therapeutic onset are delayed for several weeks whilst neuroadaptive changes take place in the brain, after which the previously disturbed serotonergic neurotransmission is restored. A suggested way ...