Journal of neuroimaging : official journal of the American Society of Neuroimaging
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Case Reports
Transcranial doppler and carotid duplex ultrasonography findings in Bow hunter's syndrome.
Bow hunter's syndrome (BHS) is caused by transient vertebro-basilar ischemia on head rotation. We report a patient with BHS who was identified from dynamic changes to blood flow velocities in the posterior cerebral, basilar and vertebral arteries using carotid duplex ultrasonography and transcranial Doppler, simultaneously. Neurosonology appears to be useful for diagnosing and evaluating BHS.
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Clinical magnetic resonance imaging (MRI) has recently entered the "high-field" era, and systems equipped with 3.0-4.0T superconductive magnets are becoming the gold standard for diagnostic imaging. While higher signal-to-noise ratio (S/N) is a definite advantage of higher field systems, higher susceptibility effect remains to be a significant trade-off. To take advantage of a higher field system in performing routine clinical images of higher anatomical resolution, we implemented a vector contrast image technique to 3.0T imaging, three-dimensional anisotropy contrast (3DAC), with a PROPELLER (Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction) sequence, a method capable of effectively eliminating undesired artifacts on rapid diffusion imaging sequences. ⋯ Anatomical images of significantly higher resolution than the best current standard, T2 reversed images, were successfully obtained. As a technique readily applicable under routine clinical setting, 3DAC PROPELLER on a 3.0T system will be a powerful addition to diagnostic imaging.