Basic Principle Dynamic MR angiography

Dynamic subtraction MR angiography provides a picture of the vascular lumen by tracking a bolus of paramagnetic contrast agent (gadopentetate dimeglumine), which is administered intravenously. This method is based on the T1 shortening of blood associated with intravenously administered gadopentetate dimeglumine . Consequently, the vascular lumen, especially the arterial lumen, demonstrates high signal intensity relative to that of solid organs and other tissues on T1-weighted gradient-echo (GRE) images. Use of subtraction enables clear demonstration of the enhanced vascular lumen by eliminating background signal 

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In dynamic subtraction MR angiography, fast arterial imaging is achieved by using a three-dimensional (3D) spoiled T1-weighted GRE sequence with a short echo time and acquiring data during the first arterial pass of a rapidly administered bolus of gadopentetate dimeglumine . Our basic method of dynamic subtraction MR angiography is shown in . By repeating the sequence after gadopentetate dimeglumine injection, the gadopentetate dimeglumine bolus can be tracked, which helps demonstrate circulation dynamics