tailieunhanh - Báo cáo hóa học: " Dynamic MR-Imaging with Radial Scanning, a Post-Acquisition Keyhole Approach"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Dynamic MR-Imaging with Radial Scanning, a Post-Acquisition Keyhole Approach | EURASIP Journal on Applied Signal Processing 2003 5 405-412 2003 Hindawi Publishing Corporation Dynamic MR-Imaging with Radial Scanning a Post-Acquisition Keyhole Approach Ralf Lethmate Laboratoire de Resonance Magnetique Nucleaire CNRS UMR5012 Universite Claude Bernard Lyon I CPE France Email rle@ Frank T. A. W. Wajer Department of Applied Physics Delft University of Technology P. O. Box 5046 2600 GA Delft The Netherlands Email Yannick Cremillieux Laboratoire de Resonance Magnetique Nucleaire CNRS UMR5012 Universite Claude Bernard Lyon I CPE France Em ail Dirk van Ormondt Department of Applied Physics Delft University of Technology P. O. Box 5046 2600 GA Delft The Netherlands Email ormo@ Danielle Graveron-Demilly Laboratoire de Resonance Magnetique Nucleaire CNRS UMR5012 Universite Claude Bernard Lyon I CPE France Email Received 15 February 2002 A new method for 2D 3D dynamic MR-imaging with radial scanning is proposed. It exploits the inherent strong oversampling in the centre of fc-space which holds crucial temporal information of the contrast evolution. It is based on 1 a rearrangement of novel 3D isotropic distributions of trajectories during the scan according to the desired time resolution and 2 a post-acquisition keyhole approach. The 2D 3D dynamic images are reconstructed using 2D 3D-gridding and 2D 3D-IFFT. The scan time is not increased with respect to a conventional 2D 3D radial scan of the same image resolution in addition one benefits from the dynamic information. An application to in vivo ventilation of rat lungs using hyperpolarized helium is demonstrated. Keywords and phrases 2D 3D dynamic MRI 3D isotropic radial sampling keyhole scan time reduction image reconstruction gridding. 1. INTRODUCTION Dynamic magnetic resonance imaging MRI is a challenging topic that opens a vast field in medical diagnosis such as .

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