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- W2068119873 abstract "Current magnetic resonance (MR) images are limited by providing only three orthogonal planes (axial, coronal, and sagittal); therefore, procedure modification is required for cardiac imaging to adjust for the orientation of the heart. This study was to optimize methods for visualization of cardiac chambers and the aortic valve, and to establish a gating technique for end-diastolic (ED) and endsystolic (ES) imaging of a desired cardiac plane. Seven pts (2 normal, 3 aortic stenosis (AS), 2 asymmetric septal hypertrophy) were studied, evaluating the following views: axial, modified axial 4-chamber (long-axis), RAO sagittal (short-axis), and aortic root (modified axial and coronal). For LV ED and ES and for gated aortic valve imaging, the following formula was developed: RD = X – ((slice # – 1) x 100 + 15), where R is the R delay in milliseconds, X is the R to desired imaging time, slice # denotes the desired plane, and 15 is a constant. Results: Images providing excellent detail of internal and external cardiac borders were obtained in all pts. The 4-chamber view better depicted the long-axis of the LV than the standard axial view. For the aortic valve, both modified axial and coronal views were useful. In the 2 pts with severe AS, the valve leaflets orifice was identified. The gating formula applied in the axial 4-chamber view provided high-quality ED and ES images in all pts studied. Conclusion: 1) The limitation of current MR imagers to three orthogonal planes can be overcome for cardiac MR by modification of pt positioning. 2) It is now possible to adequately visualize cardiac structures in various parts of the cardiac cycle." @default.
- W2068119873 created "2016-06-24" @default.
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- W2068119873 date "1984-09-01" @default.
- W2068119873 modified "2023-09-25" @default.
- W2068119873 title "OPTIMAL PATIENT POSITIONING AND DATA ACQUISITION TIMING IN CARDIAC MAGNETIC RESONANCE IMAGING" @default.
- W2068119873 doi "https://doi.org/10.1097/00003072-198409001-00012" @default.
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