By Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)
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Additional info for 3D Contrast MR Angiography
It was designed to allow simultaneous attachment of two syringes with check valves that allow the operator to inject the contrast agent and then immediately follow with a saline flush without delay. The switching from gadolinium to saline flush occurs automatically. This is particularly important for the fast breath-hold scans, where it is essential to inject and flush rapidly with no gap in the bolus. Ideally, the tubing set will be attached to the same size intravenous catheter in every patient so the operator will always feel the same resistance to flow.
1/45 0, I NEX, Field-of-View = 360x360x98, Matrix = 256x128x28, Sequential Ordering of k-space, Acquisition Time = 28 s, 40 ml gadolinium co nt rast infused at 2 mlls and timed empirically. Interpretation: Sagittal oblique (al and axial (bl MIPs show a large filling defect in the left descending pulmonary artery. D. and Martin R. D. , Ann Arbor, MI. 48 CHAPTER 2 Pulmonary MRA c a b Fig. 3. Pulmonary Hypertension. Clinical Scenario: 17 -year-old patient with tetralogy of Fallot. A high grade pulmonary artery stenosis was treated during early childhood with placement of a Waterston anastomosis connecting the ascending aorta with the right pulmonary artery.
Beyond eliminating the risks of arterial catheterization, iodinated contrast, and ionizing radiation, 3D contrast MRA combines the advantages 54 CHAPTER 3 Thoracic Aorta of arterial contrast with a cross-sectional format. Since image quality is not affected by slow flow, differentiation of thrombus from slow flow is never a problem. Multiplanar reformation of the image data aids in the display of the often complex aortic anatomy. 1). Technique Patients are imaged in the supine position. The arms should be placed above the head to minimize aliasing and to ensure a downhill path for venous return.
3D Contrast MR Angiography by Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)