The development of blood pool MR contrast agents may make it possible to replicate the concept of labeled red cell nuclear medicine examinations using 3D CE MRA. Although MR blood pool agents are experimental, the higher SNR and resolution of MR compared to nuclear medicine makes this a promising future technique for use in patients suspected of gastrointestinal (GI) bleeding. Arterial and venous mesenteric anatomy can be evaluated during the arterial and venous phases of blood pool contrast agent injection. By periodically re-imaging the patient over time, the accumulation of blood in the GI tract can be imaged to identify the site of GI bleeding. Just as with labeled red cells, when bleeding is intermittent, the patient can be scanned periodically, every hour or two until a bleeding episode is detected. The 3D-nature of MR imaging makes it easier to identify the specific loop of bowel that is bleeding [27-28].
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.