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Combined time‐resolved and high‐spatial‐resolution 3D MRA using an extended adaptive acquisition
Author(s) -
Mazaheri Yousef,
Carroll Timothy J.,
Du Jiang,
Block Walter F.,
Fain Sean B.,
Hany Thomas F.,
Aagaard Beverly D.L.,
Strother Charles M.,
Mistretta Charles A.,
Grist Thomas M.
Publication year - 2002
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.10071
Subject(s) - image resolution , signal (programming language) , computer science , contrast (vision) , temporal resolution , sampling (signal processing) , spatial frequency , computer vision , artificial intelligence , physics , optics , filter (signal processing) , programming language
Abstract Purpose To combine the benefits of time‐resolved dynamic imaging and single elliptical centric acquisitions in a reasonable scan time. Materials and Methods A time series of images with moderate spatial resolution was acquired using the 3D Time‐Resolved Imaging of Contrast KineticS (3D TRICKS) technique with elliptical centric encoding during contrast arrival. Following venous opacification, a complete large centrically encoded k‐space volume was acquired. The high‐spatial‐frequency portions of this volume were combined with a 3D TRICKS time frame to form a high‐resolution image. An additional single image is formed by suppressing background and signal averaging all acquired data, including post‐venous low‐spatial‐frequency data. For this image, 2D temporal correlation analysis is used to suppress low‐spatial‐frequency vein contributions. Arrival time and spatial correlations are used to suppress background. Results The 3D TRICKS time frame may be selected to ensure a combined high‐resolution image that has optimal central k‐space sampling for any vascular region. The single image formed by signal averaging all acquired data has increased contrast‐to‐noise (CNR) and signal‐to‐noise (SNR) ratios. Conclusion The advantages of time‐resolved and high‐spatial‐resolution imaging were combined using an extended dual‐phase acquisition. Some SNR and CNR gain was achieved by signal averaging. This process is facilitated by background and vein suppression. J. Magn. Reson. Imaging 2002;15:291–301. © 2002 Wiley‐Liss, Inc.