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Steady‐state imaging for visualization of endovascular interventions
Author(s) -
Martin Alastair J.,
Weber Oliver M.,
Saeed Maythem,
Roberts Timothy P.L.
Publication year - 2003
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10553
Subject(s) - steady state (chemistry) , visualization , spins , computer science , signal (programming language) , temporal resolution , dysprosium , biomedical engineering , nuclear magnetic resonance , radiology , artificial intelligence , medicine , physics , chemistry , optics , nuclear physics , programming language
Steady‐state imaging techniques offer the potential to couple high spatial and temporal resolution with good signal‐to‐noise ratio (SNR), which makes them ideally suited for fluoroscopic applications. However, disturbance of the steady state can result in artifacts and substantially reduced signal levels. In this study the use of steady‐state imaging techniques was investigated as a means of guiding endovascular interventions with fluoroscopic MRI. Devices containing localized susceptibility defects were shown to disturb the steady‐state signal of spins that pass through the magnetic field disturbances. It was demonstrated that these effects are appreciable and can make delineation of interventional devices difficult in the presence of flow. T 1 ‐shortening contrast agents were shown to dramatically reduce these effects by reducing the time taken to achieve steady state. The addition of a blood pool agent in an in vivo model was found to be necessary for adequate visualization of a dysprosium‐marked catheter. Magn Reson Med 50:434–438, 2003. © 2003 Wiley‐Liss, Inc.