Biomedical Engineering Reference
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Figure 3.29: Magnetic resonance angiography is shown to demonstrate the
aneurysm with both A1 and A2 anterior cerebral artery branches as patent
(shown with arrows in left panel on top). Pre- and post-clipping, intraoperative,
T1-weighted, angiographic and diffusion-weighted magnetic resonance images
were obtained from a patient with an incidental, 8-mm, anterior communicat-
ing artery aneurysm. T1-weighted images showed brain anatomic features with
visible shifts induced by surgery.
3.4.5 3D-Navigator Echo MRA
A three-dimensional navigator echo (NE) sequence on an MR scanner with a
high performance gradient system was used to evaluate MR coronary angiogs-
raphy [5]. For imaging, a navigated gradient-echo (GE) pulse sequence with an
in-plane resolution between 0 . 63 × 0 . 63 and 0 . 78 × 0 . 78 mm 2 with two overlap-
ping slabs was acquired. The number of visualized coronary artery segments
was estimated. In addition, signal-to-noise measurements were performed in
the ascending aorta at the level of the proximal right and left coronary arteries.
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