Radiology
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To determine whether magnetic resonance (MR) imaging with diffusion-weighted (DW) imaging can help discriminate between radiologically indeterminate benign and malignant orbital masses and to identify optimal apparent diffusion coefficient (ADC) thresholds for such discrimination. ⋯ Echo-planar DW MR imaging can help characterize indeterminate orbital masses.
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To assess the effectiveness and cost-effectiveness of state-of-the-art noninvasive diagnostic imaging strategies in patients with a transient ischemic attack (TIA) or minor stroke who are suspected of having carotid artery stenosis (CAS). ⋯ In diagnosing CAS, duplex US should be the initial test, and, if its results are positive, CT angiography should be performed; patients with 70%-99% stenoses should then undergo carotid endarterectomy. In patients with a high-risk profile, a high probability of CAS, or who can undergo surgery without delay, immediate CT angiography and surgery for 50%-99% stenoses is indicated.
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To determine whether thromboembolic risk factor assessment could accurately indicate the pretest probability for pulmonary embolism (PE), and if so, computed tomographic (CT) angiography might be targeted more appropriately than in current usage, resulting in decreased costs and radiation exposure. ⋯ In the setting of no risk factors, it is extraordinarily unlikely (0.95% chance) to have a CT angiogram positive for PE. This selectivity and triage step should help reduce current costs and radiation exposure to patients.
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To determine the effect of sedative and anesthetic administration on the duration and costs of pediatric magnetic resonance (MR) imaging. ⋯ Visit durations were significantly longer for anesthetized and sedated patients. Anesthetized patients incurred the highest costs, followed by sedated patients.
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To measure the cerebral autoregulatory status of the brain tissue supplied by the individual brain-feeding arteries in patients with symptomatic stenosis of the internal carotid artery (ICA) by using arterial spin-labeling (ASL) magnetic resonance (MR) imaging and to compare this status with that in healthy controls. ⋯ In patients with symptomatic stenosis of the ICA, vasodilatory capacity in the flow territories of the major cerebral arteries can be visualized and quantified at the brain tissue level with ASL MR imaging.