Toward accurate and fast velocity quantification with 3D ultrashort TE phase-contrast imaging.

Purpose: Traditional phase-contrast MRI is affected by displacement artifacts caused by non-synchronized spatial- and velocity-encoding time points. The resulting inaccurate velocity maps can affect the accuracy of derived hemodynamic parameters. This study proposes and characterizes a 3D radial phase-contrast UTE (PC-UTE) sequence to reduce displacement artifacts.

First implementation of dynamic oxygen-17 (O) magnetic resonance imaging at 7 Tesla during neuronal stimulation in the human brain.

Objective: First implementation of dynamic oxygen-17 (O) MRI at 7 Tesla (T) during neuronal stimulation in the human brain.

Methods: Five healthy volunteers underwent a three-phase O gas (O) inhalation experiment. Combined right-side visual stimulus and right-hand finger tapping were used to achieve neuronal stimulation in the left cerebral hemisphere.

First application of dynamic oxygen-17 magnetic resonance imaging at 7 Tesla in a patient with early subacute stroke.

Dynamic oxygen-17 (O) magnetic resonance imaging (MRI) is an imaging method that enables a direct and non-invasive assessment of cerebral oxygen metabolism and thus potentially the distinction between viable and non-viable tissue employing a three-phase inhalation experiment. The purpose of this investigation was the first application of dynamic O MRI at 7 Tesla (T) in a patient with stroke. In this proof-of-concept experiment, dynamic O MRI was applied during O inhalation in a patient with early subacute stroke.

An investigation into the dependence of virtual observation point-based specific absorption rate calculation complexity on number of channels.

Purpose: This study aims to find a relation between the number of channels and the computational burden for specific absorption rate (SAR) calculation using virtual observation point-based SAR compression.

Methods: Eleven different arrays of rectangular loops covering a cylinder of fixed size around the head of an anatomically correct voxel model were simulated. The resulting Q-matrices were compressed with 2 different compression algorithms, with the overestimation fixed to a certain fraction of worst-case SAR, median SAR, or minimum SAR.

[Infected pseudarthrosis of the symphysis with persisting instability : Revision osteosynthesis with tantalum cage and silver ionized ITS plate after peri-implant infection with MRSE after osteosynthetic stabilization of a type C pelvic injury].

Overall symptomatic pseudathrosis after pelvic ring fracture is rare. A pseudarthrosis of the dorsal pelvic ring often leads to persisting pain due to instability and needs a consequent treatment strategy. Often a bacterial infection can be found in persisting pseudarthrosis notably in the anterior pelvic ring region.