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selTracked Fastcard amp。 Spiral ? 3D Nonbreathheld with NAV correction A Family of Techniques Image courtesy of ? Dr. Vince Ho, Uniformed Services University of the Health Sciences (USUHS) / National Naval Medical Center (NNMC) Bethesda, MD ? NIH Radiology, Bethesda, MD Coronary MRA Breathheld Spiral Technique ? Breathheld (18 sec) ? 2D slice (5mm) ? Noncontrast enhanced ? 20 X 4096 matrix ? mm/pixel resolution High Resolution Spiral MRA Coronary MRA High Resolution Spiral Imaging Coronary MRA High Resolution 3D Spiral Imaging RCA . 8mm pixel resolution LCA . 8mm pixel resolution MRI的臨