The following are highlights from current issues of RSNA’s two peer-reviewed journals.
Resting-state (RS) functional MR imaging has proven to be a very rich source of brain connectivity data, which can be obtained within 10 minutes of scanning and offer an unprecedented new window into the brain.
RS functional MR imaging identifies alterations in functional connectivity in many neurologic and psychiatric diseases, even in neonates and in patients with coma or dementia. In an article in the July issue of Radiology (RSNA.org/Radiology), Frederick Barkhof, M.D., Ph.D., of the Neuroscience Campus Amsterdam, VU University Medical Centre, the Netherlands, and colleagues discuss RS functional MR imaging in terms of:
Although RS functional MR imaging is gaining substantial traction in the neuroscience community and several clinical applications are starting to emerge, “… better understanding of physiologic and pharmacologic effects and confounds are needed before clinical application can be established,” the authors conclude.
Existing noise reduction strategies for dose reduction have a substantial impact on lowering the radiation dose at CT. To preserve the diagnostic benefit of CT, thoughtful utilization of these strategies must be based on the inherent lesion-to-background contrast and the anatomy of interest.
In an article in the July-August issue of RadioGraphics (RSNA.org/RadioGraphics), Eric C. Ehman, M.D., of the Mayo Clinic, Rochester, Minn., and colleagues provide an overview of existing noise reduction strategies for low-dose abdominopelvic CT, including analytic reconstruction, image and projection space denoising and iterative reconstruction. The authors also review qualitative and quantitative tools for evaluating these strategies and discuss the strengths and limitations of individual noise reduction methods.
Methods are needed for quantitating contrast-dependent spatial resolution, conducting observer performance studies for a variety of diagnostic tasks (and developing tools to facilitate the rapid completion of these tasks) and predicting the lowest dose that will allow adequate performance on specific CT systems, according to the authors.
“The full impact of noise reduction techniques on radiation dose and radiologist performance is in the early phases of realization, with great potential to benefit patients by decreasing the radiation dose they receive while undergoing CT,” the authors write.
Listen to Radiology Editor Herbert Y. Kressel, M.D., deputy editors and authors discuss the following articles in the May issue of Radiology at RSNA.org/RadiologyPodcasts:
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