Two MRI research articles

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Two MRI research articles

Postby bromley » Tue Feb 13, 2007 3:39 am

Two MRI research articles. The negative side of me reads these and thinks - the more they find out about this disease the worse it seems to get. The positive side of me thinks that technology, through better MRI etc, is giving us a much better understanding of what's going on, which should lead to better treatments / ways of monitoring treatment.

Ian

Extent of brain involvement at diagnosis may predict rate of later brain atrophy in patients with MS 13 February 2007

In patients with recently diagnosed multiple sclerosis, the extent of accumulated brain tissue loss and overall lesion load as determined by magnetic resonance imaging (MRI) may predict the rate of cerebral atrophy over the following two years, according to a report in the February issue of Archives of Neurology.

MRI provides valuable information about the progression of multiple sclerosis (MS), according to background information in the article. MRI is used to monitor the number and volume of MS-related lesions (damaged tissue), which can help monitor the evolution of the disease but does not appear to be associated with the patient's disability status. Brain volume, also measured by MRI, "is currently considered to be a marker of the neurodegenerative component of MS pathological features, thereby better reflecting the pathological background of irreversible clinical disability in MS," the authors write.

Bas Jasperse, M.D., and colleagues at the VU University Medical Center, Amsterdam, the Netherlands, performed brain MRI shortly after diagnosis and again after two years in 89 patients with MS (average age, 37.5). The numbers and volume of two types of lesions apparent on MRI, black hole (dark appearing lesions that indicate the loss of myelin, neurons' protective coating) and T2 (newer, brighter appearing lesions), were recorded along with brain volume. Change in brain volume between scans was calculated, and participants were also assessed for neurologic disability.

"The mean [average] annualised rate of cerebral atrophy was -0.9 percentage of brain volume change per year," the authors write. "Baseline normalised brain volume and baseline T2 lesion load were identified as explanatory variables for the subsequent percentage of brain volume change per year and yielded a regression model that explained 31.2 percent of the variance in percentage of brain volume change per year."

In other words, "patients who have acquired more brain tissue loss and more T2 lesions are prone to have a higher rate of subsequent brain atrophy," the authors conclude. "In this relationship, the extent of brain tissue loss seemed more important than lesional activity. Because a higher rate of cerebral atrophy is predictive of worse clinical functioning at a later stage in the MS disease course, our findings suggest that these two baseline variables could have prognostic value for clinical functioning in early MS."

Understanding How MS Worsens

In patients with MS, "the unpredictable and often dramatic appearance of clinical relapses and focal MRI abnormalities tend to catch our attention," writes J. Theodore Phillips, M.D., Ph.D., of The Multiple Sclerosis Center at Texas Neurology, Dallas, in an accompanying editorial. "However, these events can often obscure more insidious, but no less important, destructive changes, such as irreversible disability progression and MRI-evident brain atrophy."

"In this issue of Archives, Jasperse and colleagues demonstrate that the rate of new brain atrophy in newly diagnosed MS patients studied over two years is significantly predicted by MRI-determined brain atrophy and T2 lesion load at the time of diagnosis. Lower brain volume and higher T2 lesion load at the time of diagnosis predict greater brain volume loss over a two-year observation period.

"This finding provides not only important clinical prognostic information, but also indicates the necessity of accounting for these baseline MRI variables in future clinical study designs that use brain atrophy as an outcome variable," Dr. Phillips continues.

Note: The Netherlands Organisation for Scientific Research supported this study. The MS center Amsterdam is financially supported by the Dutch MS research foundation.

Source: Archives of Neurology - (Arch Neurol. 2007;64:190-194.)

Cerebral Cortical Lesions in Multiple Sclerosis Detected by MR Imaging at 8 Tesla 13 February 2007

A. Kangarlua, E.C. Bourekasa,c, A. Ray-Chaudhuryb and K.W. Rammohanc a Department of Radiology, The Ohio State University College of Medicine, Columbus, Ohio
b Department of Pathology, The Ohio State University College of Medicine, Columbus, Ohio
c Department of Neurology, The Ohio State University College of Medicine, Columbus, Ohio

BACKGROUND AND PURPOSE: Conventional imaging of ex-vivo brain at 1.5T in multiple sclerosis (MS) detects only a small fraction of the gray matter cerebral cortical lesions that can be detected by pathology. Our purpose was to examine if imaging at 8T can detect plaques in cortical gray matter (CGM) not evident at 1.5T.

METHODS: An ex-vivo brain obtained at autopsy from a patient with MS was formalin fixed and 1 cm coronal slices were examined using MR imaging at 8T.

RESULTS: Numerous cerebral cortical lesions not evident at 1.5T were seen at 8T. Lesions were easily identified using gradient-echo and spin-echo (SE) as well as diffusion images. MR imaging at 8T identified many of the types of plaques previously evident only by pathology. The magnitude of the cortical involvement in this 1 patient was severe. Lesions in the gray matter readily visible by high-field MR imaging were sometimes barely visible by pathology. MR imaging at 8T often facilitated the detection of such plaques by pathology.

CONCLUSION: This study establishes the utility of high-field imaging at 8T in the delineation of plaques in the cerebral CGM in MS.

Source: American Journal of Neuroradiology 28:262-266, February 2007 © 2007 American Society of Neuroradiology
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