Advances in cardiac applications of subsecond flash MRI |
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Authors: | Daisy Chien, Klaus-Dietmar Merboldt, Wolfgang H nicke, Harald Bruhn, Michael L. Gyngell,Jens Frahm |
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Affiliation: | Max-Planck-Institut für biophysikalische Chemie, Postfach 2841, D-3400, Göttingen, FRG |
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Abstract: | Flow-suppressed, subsecond FLASH MR images of the normal human heart have been obtained from single cardiac cycles using a 2.0-T whole-body MRI/MRS system (Siemens Magnetom) equipped with conventional 10 mT m−1 gradients. The present results demonstrate further technical improvements as compared to a previous report on the same subject (Magn. Reson. Med. 13:150–157; 1990). Measuring times of 139 msec and 209 msec were achieved by reducing the repetition time to TR = 4.36 msec (TE = 2.8 msec) and the spatial resolution to 32 × 128 or 48 × 128 measured data points, respectively. The flip angle was optimized to 12°. Spatial pre-saturation of 60 mm thick sections adjacent to the imaging plane resulted in a suppression of the blood signal and a clear delineation of the myocardium. Oblique rotation of the imaging slice provides convenient access to the anatomical long axis and short axis views of the heart. EKG-triggered images from separate heartbeats but at different cardiac phases demonstrate that the effective time resolution is considerably less than the actual imaging time. |
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Keywords: | Author Keywords: Heart, MR studies Heart, anatomy Heart, ventricles Myocardium, MR studies Magnetic resonance, pulse sequence Magnetic resonance, technology Magnetic resonance, physics |
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