Abstract
We report preliminary results of imaging intracranial vascular malformations with time-resolved projection MRA after a bolus injection of contrast median before and after endovascular treatment. Projection angiograms are acquired with a slice-selective snapshot FLASH sequence with a time resolution of two images per second, 40-60 images being acquired consecutively after bolus injection of 15 ml Gd-DTPA. Postprocessing of images in 2D projection MRA by correlation analysis offers several advantages with significant improvement of signal-to-noise, leading to adequate anatomical resolution. Subsecond projection MRA is a reliable technique for imaging intracranial vessels and gives information about the haemodynamics of vascular malformations.
MeSH terms
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Angiography, Digital Subtraction
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Arteriovenous Fistula / diagnosis*
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Arteriovenous Fistula / diagnostic imaging
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Arteriovenous Fistula / therapy
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Carotid Artery, Common / diagnostic imaging
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Carotid Artery, Common / pathology
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Carotid Artery, External / diagnostic imaging
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Carotid Artery, External / pathology
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Contrast Media / administration & dosage
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Dura Mater / blood supply*
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Embolization, Therapeutic
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Gadolinium DTPA / administration & dosage
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Hemodynamics
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Humans
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Image Enhancement
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Image Processing, Computer-Assisted / methods*
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Injections, Intravenous
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Intracranial Arteriovenous Malformations / diagnosis*
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Intracranial Arteriovenous Malformations / diagnostic imaging
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Intracranial Arteriovenous Malformations / therapy
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Jugular Veins / diagnostic imaging
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Jugular Veins / pathology
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Magnetic Resonance Angiography / methods*
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Reproducibility of Results
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Signal Processing, Computer-Assisted
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Time Factors
Substances
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Contrast Media
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Gadolinium DTPA