AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Nov 2008
Comparative Study3D time-resolved MR angiography (MRA) of the carotid arteries with time-resolved imaging with stochastic trajectories: comparison with 3D contrast-enhanced Bolus-Chase MRA and 3D time-of-flight MRA.
Time-resolved MR angiography (MRA) offers the combined advantage of large anatomic coverage and hemodynamic flow information. We applied parallel imaging and time-resolved imaging with stochastic trajectories (TWIST), which uses a spiral trajectory to undersample k-space, to perform time-resolved MRA of the extracranial internal carotid arteries and compare it to time-of-flight (TOF) and high-resolution contrast-enhanced (HR) MRA. ⋯ The TWIST technique consistently obtained pure arterial phase images while providing dynamic information. It is rapid, uses a low dose of contrast, and may be useful in specific circumstances, such as in the acute stroke setting. However, it does not yet have spatial resolution comparable with standard contrast-enhanced MRA.
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Major neurologic morbidity and mortality with vertebroplasty are rare. We describe a 71-year-old woman who had a stroke approximately 30 minutes after vertebroplasty. ⋯ Emergency embolectomy was attempted but was unsuccessful. This report emphasizes the need to be aware that intracranial embolization of polymethylmethacrylate can occur and describes management strategies to consider.