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Keyhole method for high‐speed human cardiac cine MR imaging
Author(s) -
Suga Mikio,
Matsuda Tetsuya,
Komori Masaru,
Minato Kotaro,
Takahashi Takashi
Publication year - 1999
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/(sici)1522-2586(199911)10:5<778::aid-jmri23>3.0.co;2-2
Subject(s) - keyhole , cardiac cycle , magnetic resonance imaging , cardiac imaging , cardiac magnetic resonance imaging , computer science , biomedical engineering , medicine , nuclear medicine , radiology , materials science , cardiology , welding , metallurgy
Although electrocardiographic (ECG)‐gated magnetic resonance (MR) imaging is widely used for cardiac imaging, it has several disadvantages, such as long imaging time, respiratory artifacts, and motion artifacts induced by arrhythmia. An MR image can be acquired within about 0.3 seconds by using a fast gradient‐echo imaging method. When this method is continuously applied, only two to three images can be obtained during a single cardiac cycle. The goal of this study is to obtain cine MR images in a single cardiac cycle using fast gradient‐echo imaging combined with the “keyhole” method. The optimal conditions for the keyhole method for cardiac cine imaging were obtained by computer simulation based on a simplified cardiac model. When the read‐out direction was set parallel to the cardiac short axis, left ventricular motion was almost correctly reproduced by the keyhole method with acquisition time reduced to one‐fourth. J. Magn. Reson. Imaging 1999;10:778–783. © 1999 Wiley‐Liss, Inc.