Test-retest stability of spontaneous brain activity and functional connectivity in the core resting-state networks assessed with ultrahigh field 7-Tesla resting-state functional magnetic resonance imaging.

The growing demand for precise and reliable biomarkers in psychiatry is fueling research interest in the hope that identifying quantifiable indicators will improve diagnoses and treatment planning across a range of mental health conditions. The individual properties of brain networks at rest have been highlighted as a possible source for such biomarkers, with the added advantage that they are relatively straightforward to obtain. However, an important prerequisite for their consideration is their reproducibility.

Dynamics of task-induced modulation of spontaneous brain activity and functional connectivity in the triple resting-state networks assessed using the visual oddball paradigm.

The default mode network (DMN), the salience network (SN), and the central executive network (CEN) are considered as the core resting-state brain networks (RSN) due to their involvement in a wide range of cognitive tasks. Despite the large body of knowledge related to their regional spontaneous activity (RSA) and functional connectivity (FC) of these networks, less is known about the dynamics of the task-associated modulation on these parameters and the task-induced interaction between these three networks. We have investigated the effects of the visual-oddball paradigm on three fMRI measures (amplitude of low-frequency fluctuations for RSA, regional homogeneity for local FC, and degree centrality for global FC) in these three core RSN.

Image quality and radiation exposure with low-contrast-dose computed tomography angiography of the lower extremities.

Introduction: Multidetector computed tomography is the reference standard for the diagnosis of peripheral arterial disease (PAD). The aim of this study is to optimise the image quality of computed tomography (CT) scanning for the diagnosis of PAD with the lowest possible radiation and contrast volume.

Material And Methods: Seventy-two patients were referred for evaluation of suspected PAD with CT angiography.

Rib fracture: Different radiographic projections.

Background: Rib fracture is the most common thoracic injury. It is thought to be present in 10% of all traumatic injuries and in almost 40% of patients who sustained severe non-penetrating trauma. There are 12 pairs of ribs.

Wrist: Different views in CT scanning.

This study tests various acquisition and reconstruction protocols for MDCT of the wrist to determine the optimal views in wrist imaging. These views include: wrist in prone position, perpendicularly to CT gantry; wrist in prone position with internal and external deviation of the hand and PA wrist image reformatted in CT workstations along the axis of the scaphoid bone.Among these different views of wrist CT, the axial image reformatted along the long axis of the scaphoid provides us with the best diagnostic findings of the scaphoid.