AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Dec 2011
Using quantitative CT perfusion for evaluation of delayed cerebral ischemia following aneurysmal subarachnoid hemorrhage.
DCI is a serious complication following aneurysmal SAH leading to permanent neurologic deficits, infarction, and death. Our aim was to prospectively evaluate the diagnostic accuracy of CTP and to determine a quantitative threshold for DCI in aneurysmal SAH. ⋯ CBF and MTT have the highest overall diagnostic accuracy. Threshold values of 35 mL/100 g/min for CBF and 5.5-second MTT are suggested for DCI on the basis of the patient population utility method. Absolute threshold values may not be generalizable due to differences in scanner equipment and postprocessing methods.
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AJNR Am J Neuroradiol · Dec 2011
Multiparametric MR imaging of sinonasal diseases: time-signal intensity curve- and apparent diffusion coefficient-based differentiation between benign and malignant lesions.
The sinonasal region is a platform for a broad spectrum of benign and malignant diseases, and image-based differentiation between benign and malignant diseases in this area is often difficult. Here, we evaluated multiparametric MR imaging with combined use of TICs and ADCs for the differentiation between benign and malignant sinonasal tumors and tumorlike diseases. ⋯ Multiparametric MR imaging by using TICs and ADCs may help differentiate benign and malignant sinonasal diseases.
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Clopidogrel is an inhibitor of platelet aggregation, indicated for the prevention of ischemic stroke and in-stent thrombosis. However, it has a number of drawbacks, including an increased risk of hemorrhage; a clinical effect that is slow in onset and irreversible; a genetically determined variability in its clinical potency; and interactions with other commonly administered drugs.
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A brief review of the Physician Quality Reporting System (PQRS) is presented highlighting the program's legislative history, eligibility requirements and incentive payment plan. Specifically, PQRS measures applicable to neuroradiology practice are discussed. Several steps are suggested for individual physicians or group practices to start participation in the program. Resources are also provided for further information on the program requirements and PQRS measures.
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AJNR Am J Neuroradiol · Nov 2011
ReviewFluid-attenuated inversion recovery vascular hyperintensities: an important imaging marker for cerebrovascular disease.
Vascular hyperintensities have been noted on FLAIR sequences obtained in the setting of acute stroke and intracranial steno-occlusive disease. The presence of FVHs likely represents disordered blood flow, often from collaterals distal to arterial occlusion or stenosis. As opposed to other vessel signs seen in arterial insufficiency, FVH is unique in that it does not represent thrombus, but rather sluggish or disordered blood flow through vessels. This review will discuss the diagnostic and prognostic value of FVH and its impact on clinical decision-making.