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Quantitative Analysis of ECG-Gated High-Resolution Contrast-Enhanced MR Angiography of the Thoracic Aorta

¹ Department of Radiology, Northwestern University Feinberg School of Medicine, 676 N St. Clair St., Ste. 800, Chicago, IL 60611.
² Department of Biomedical Engineering, Northwestern University Feinberg School of Medicine, Chicago, IL 60611.

View larger version (6K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1 —Acquisition window during cardiac cycle. AqT indicates acquisition time during diastole and is repeated for illustrative purposes on two following cardiac cycles.

View larger version (123K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2 —Vessel sharpness was evaluated from source images that were compiled to make this maximumintensity-projection image. Sharpness was evaluated at three locations: ascending thoracic aorta = 1, aortic arch = 2, and descending thoracic aorta = 3, as shown on this image.

View larger version (9K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3 —Sharpness was calculated using line projected through slope of signal intensity profile to determine distance between 80% and 20% maximum values. This was performed on both sides of profile and averaged. Procedure is performed on one side in this figure for illustration.

View larger version (118K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4 —Side-by-side comparison of gated and ungated images. Left column contains ungated images and right column contains ECG-gated images. Top row is comparison of two patients (35-year-old man with ascending aortic aneurysm and 63-year-old woman with aortic aneurysm). Bottom row is of single patient (21-year-old woman with aneurysm and focal narrowing). Emphasis should be placed on observing blurring that is present in ungated scans (left column) and absent in gated scans (right column), particularly at root of aorta and ascending aorta. Both ungated images show large amount of blurring at root of aorta.

View larger version (12K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5 —Graph shows data for entire study population. Various levels of aorta are labeled, and increases in sharpness can be seen in more visual manner. Shaded bars indicate data with ECG gating and unshaded bars indicate data without ECG gating.

View larger version (12K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6 —Graph shows data for subset of patients who underwent both ECG gated and ungated imaging. Various levels of aorta are labeled, and increases in sharpness can be seen in more visual manner. Shaded bars indicate data with ECG gating and unshaded bars indicate data without ECG gating.

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