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MRI

Image: Simplified illustration shows disease simulation model. Patients start in the 70%– 89% luminal narrowing state and progress or regress to other narrowing states, experience a stroke, undergo revascularization (revasc), or die of stroke-related or nonstroke-related causes (Photo courtesy of the Radiological Society of North America).

fMRI Identifies Asymptomatic Individuals at Risk for Stroke

Imaging can be a cost-effective way to identify people at risk for stroke who might benefit from aggressive intervention, according to a new modeling study.  More...
02 Oct 2014
Image: Patients in a vegetative state had brain activity levels matching those of healthy controls while watching a Hitchcock film (Photo courtesy of Western University’s Lorina Naci).

Neuroscientists Differentiate Patients in Ongoing Vegetative State

Researchers are employing advanced brain scanning techniques by showing that a short movie can be used to detect consciousness in vegetative state patients.   More...
30 Sep 2014
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World’s First Wearable Prostate Coil Facilitates Simple and Accurate Positioning

A wearable prostate coil has been designed to be similar to wearing a diaper; this specialized magnetic resonance imaging device positions the multiple antenna elements as close as possible to the target anatomies regardless of patient size.  More...
30 Sep 2014

Dedicated Diffusion Tensor Imaging Helps Predict Effects of Mild Traumatic Brain Injury

Diffusion tensor imaging, a specialized MRI technique that identifies microstructural alterations in brain tissue, can help clinicians better predict the likelihood for poor clinical outcomes following mild traumatic brain injury compared to conventional imaging techniques such as CT, according to a new study.  More...
29 Sep 2014
Image: Multi-echo MRI fat fractions positively correlate with the grade of steatosis estimated by histopathologic measurements. (A) Representative multi-echo MRI images showing different degrees of water and fat intensity, and fat fraction in different patients. (B) Multi-echo MRI fat fractions positively correlate with the grade of steatosis estimated by histopathologic measurements in human livers (n =129). Dots represent the values of each case. (C) Multi-echo MRI fat fraction mean values of each steatosis grading group (0 to 3 scale). CV, coefficient of variation; MRI, magnetic resonance imaging; Std. Dev, standard deviation (Photo courtesy of Jiménez-Agüero, et al: BMC Medicine 2014 12:137).

MRI Helps to Identify and Quantify Fat in the Liver

Spanish investigators have shown that magnetic resonance imaging is a good modality—better than hepatic biopsy—for identifying fats in the liver and for quantifying them.  More...
28 Sep 2014
Image: fMRI scans across all subjects in the study. The yellow and red areas in section A represent parts of the brain that are activated while subjects are forming “gist memories” of pictures viewed. Section B represents areas of increased activation, shown in yellow and red, as detailed memories are being formed (Photo courtesy of Jagust Lab).

fMRI Shows Neural Compensation Found in Individuals with Alzheimer’s-Related Protein

A neuroimaging study has demonstrated that the human brain is capable of a neural plasticity that compensates for the accumulation of beta-amyloid, a destructive protein linked with Alzheimer’s disease.  More...
24 Sep 2014
Image: Scheme demonstrating how an MPF map is computed from source MR images. Imaging protocol includes three gradient-echo images with variable flip angles, a gradient-echo image with off-resonance radiofrequency saturation enabling the magnetization transfer effect (MT-weighted image), and a reference image that is a similar gradient-echo image obtained without saturation. Additionally, an MR imager produces maps of the main magnetic field (B0) and radiofrequency field (B1), which are used to correct errors caused by imperfectness of imager\'s hardware. MPF maps are computed voxel-by-voxel in two steps, (A) and (B), using special software developed by the authors. During the first step (A), a map of the longitudinal relaxation rate (R1) is generated as described in the literature. This map along with an MT-weighted image and a reference image are used to compute an MPF map in the second step (B) based on an iterative algorithm recently described by the authors (Photo courtesy of the Radiological Society of North America).

Macromolecular Proton Fraction Mapping and MRI Reveal That Loss of Myelin Denotes Severity of Multiple Sclerosis

People with multiple sclerosis lose myelin in the gray matter of their brains, and the loss is closely correlated with the severity of the disease, according to new magnetic resonance imaging findings.   More...
24 Sep 2014


MedImaging's MRI channel in addition to reporting on MR hardware, informs about the many magnetic resonance applications possible with the technique notably MRI, fMRI, diffusion MRI, MR angiography, MR guided surgery, in addition to industry developments, and safety issues.
 
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