Assertion: main renal artery | /r/HasProperty | ratio of renal artery velocity
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text: In combination with clinical presentation, the ultrasound information will dictate the need for additional studies such as MR angiography, CT angiography, or digital subtraction angiography (DSA), depending on institutional resources and preferences [12–14]. To minimize the number of unnecessary additional studies (which can be costly, invasive, and associated with administration of potentially toxic contrast material), investigators have assessed several ultrasound parameters regarding their value in evaluating for TRAS: the peak systolic velocity in the main renal artery, ratio of renal artery velocity to iliac artery velocity, intraparenchymal artery resistive indexes, and intraparenchymal arterial systolic acceleration time [1,