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Published online before print October 22, 2001, 10.1148/radiol.2213010455
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(Radiology. 2001;221:827-836.)
© RSNA, 2001

Technical Developments

Segmented k-Space and Real-Time Cardiac Cine MR Imaging with Radial Trajectories1

Ajit Shankaranarayanan, PhD, Orlando P. Simonetti, PhD, Gerhard Laub, PhD, Jonathan S. Lewin, MD and Jeffrey L. Duerk, PhD

1 From the Departments of Radiology (Magnetic Resonance Imaging) (A.S., J.S.L., J.L.D.), Biomedical Engineering (A.S., J.L.D.), and Oncology (J.S.L.), Case Western Reserve University and University Hospitals of Cleveland, 11100 Euclid Ave, Cleveland, OH 44106; and Siemens Medical Systems, Chicago, Ill (O.P.S., G.L.). Received February 14, 2001; revision requested March 28; revision received May 18; accepted June 5. Supported in part by research collaborations with Siemens Medical Systems (Chicago, Ill), Radionics (Burlington, Mass), and Guidant (Santa Clara, Calif) and grants from the Whitaker Foundation, the American Cancer Society, the Mary Ann S. Swetland Fund, the M. E. and F. J. Callahan Foundation and by National Institutes of Health, National Cancer Institute grants 1R01CA81431-01A1 and R33-CA88144-01. Address correspondence to J.L.D. (e-mail: duerk@uhrad.com).

The authors developed and evaluated two cine magnetic resonance (MR) imaging sequences with a radial rather than a rectilinear k-space coordinate frame: segmented k space and real-time true fast imaging with steady-state precession, or FISP. The two radial k-space segmentation (or view sharing) techniques, which were interleaved or continuous, were compared, and the feasibility of their application in cardiac cine MR imaging was explored in phantom and volunteer studies. Images obtained with the radial sequences were compared with those obtained with two-dimensional Fourier transform, or 2DFT, sequences currently used in cine MR imaging. Temporal resolution of 55 msec was achieved with the real-time radial sequences, which allowed acquisition of almost 19 high-quality images per second.

Supplemental material: radiology.rsnajnls.org/cgi/content/full/2213010455/DC1.

Index terms: Heart, MR, 51.121412 • Magnetic resonance (MR), cine study, 51.121412 • Magnetic resonance (MR), image processing, 51.121412 • Magnetic resonance (MR), technology, 51.121412




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