Document Detail


Differentiation of spinal cord arteries and veins by time-resolved MR angiography.
MedLine Citation:
PMID:  17659566     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To dynamically resolve the inlet arteries and outlet veins of the spinal cord, particularly the Adamkiewicz artery (AKA) and great anterior radiculomedullary vein (GARV), using MR angiography (MRA). MATERIALS AND METHODS: First, conventional two-phase angiography (acquisition time = 38-55 seconds) utilizing elliptic centric k-space ordering was applied to aortic-aneurysm patients. Changes of vessel intensity were compared between two subsequent dynamic phases. Computer modeling of bolus enhancement and k-space sampling was performed to demonstrate the relation between vessel enhancement, acquisition time, and vessel diameter. Second, time-resolved (TR, or "keyhole") angiography using a reduced number of phase-encoding steps was explored in healthy volunteers and aortic-aneurysm patients using acquisition times (range = 6-8.5 seconds) shorter than the spinal cord circulation time. RESULTS: Using two-phase angiography the AKA and GARV were covisualized in the early phase, and contrast decreased for the AKA and increased for the GARV in most (70%) but not all cases. Computer modeling showed that the arteriovenous contrast strongly depended on vessel diameter, and complete separation was only obtained with short acquisition times. Using TR MR angiography (TR-MRA), complete temporal separation of the AKA and GARV was realized in all cases (100%). CONCLUSION: The AKA and GARV can be completely separated by TR-MRA.
Authors:
Karolien Jaspers; Robbert J Nijenhuis; Walter H Backes
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of magnetic resonance imaging : JMRI     Volume:  26     ISSN:  1053-1807     ISO Abbreviation:  J Magn Reson Imaging     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-31     Completed Date:  2007-10-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9105850     Medline TA:  J Magn Reson Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  31-40     Citation Subset:  IM    
Copyright Information:
Copyright 2007 Wiley-Liss, Inc.
Affiliation:
Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Aged, 80 and over
Computer Simulation
Contrast Media
Female
Gadolinium DTPA
Humans
Image Processing, Computer-Assisted
Magnetic Resonance Angiography / methods*
Male
Middle Aged
Spinal Cord / blood supply*
Chemical
Reg. No./Substance:
0/Contrast Media; 80529-93-7/Gadolinium DTPA

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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