By Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)
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Extra resources for 3D Contrast MR Angiography
MR angiography images are acquired without the use of ionizing radiation. This is of great advantage in the assessment of young patients. Since very thin images are required for adequate depiction of the vascular anatomy, the radiation dose associated with CTA is considerable, especially in critical areas such as the neck or the pelvis. 3D MR angiography acquisitions can be repeated multiple times before, during, and post contrast to evaluate temporal patterns of enhancement without any concern for radiation dose.
As a result, treatment for pulmonary embolism is often undertaken without the benefit of a definitive diagnosis. A major impetus for using a cross-sectional imaging technique for the diagnostic workup of patients suspected of PE is based on the des ire to image the pulmonary arteries directly, without incurring high cost, and, of course, patient morbidity. Initially, spiral CTA had a distinct advantage over MR angiography in evaluation of suspected PE. Recent advances in 3D contrast MRA, however, show considerable promise because MR has developed into an inexpensive, fast, accurate, and reliable test for the assessment of PE.
Among them, pulmonary and coronary 3D MRA may feature prominently. Other uses relate to venous imaging and "road map" imaging for monitoring vascular interventions. Can Stents Be Imaged With 3D Contrast MRA 37 Clearly, however, 3D contrast MRA can be performed weIl without blood pool agents. Extracellular agents not only provide excellent image quality, but, as indicated previously, they also have an outstanding safety profile, which will be difficult to match with any newagent. Can Stents Be Imaged With 3D Contrast MRA?