Intracranial MR angiography: application of magnetization transfer contrast and fat saturation to short gradient-echo, velocity-compensated sequences
Autor: | Jean A. Tkach, E. M. Haacke, Weili Lin, Thomas J. Masaryk |
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Rok vydání: | 1993 |
Předmět: |
Intracranial Arteriovenous Malformations
medicine.diagnostic_test business.industry Intracranial Aneurysm Magnetic resonance imaging Pulse sequence Arteriovenous malformation Image processing Cerebral Arteries Image Enhancement medicine.disease Magnetic Resonance Imaging Cerebrovascular Disorders Stenosis Nuclear magnetic resonance Angiography Image Processing Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging Magnetization transfer Artifacts Nuclear medicine business Saturation (magnetic) |
Zdroj: | Radiology. 186:753-761 |
ISSN: | 1527-1315 0033-8419 |
Popis: | To circumvent artifacts related to saturation, turbulence, and data processing in three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) angiography, the authors used a high-resolution (256 x 512), short, asymmetric velocity-compensated gradient-echo sequence, magnetization transfer contrast (MTC) between all excitation pulses to suppress brain parenchyma signal, and frequency-offset fat saturation (FS) to suppress fat signal. Signal intensity and blood-background contrast was measured in several regions of interest on conventional 3D TOF MR images, MTC images, and those with MTC and FS in seven volunteers. One patient each with an arteriovenous malformation, an aneurysm, and stenosis in the intracranial vascular system underwent the protocols with an echo time (TE) of 5 msec and then a TE of 8 msec. Use of the 5-msec-TE sequence with MTC and FS led to reduced problems associated with signal void in areas of fast flow in patients. In volunteers and patients, vascular visualization was superior to that of current 3D TOF techniques. |
Databáze: | OpenAIRE |
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