ound ▁may ▁be ▁used ▁to ▁detect ▁ren al ▁blood ▁flow . ▁It ▁is ▁most ▁commonly ▁used ▁to ▁detect ▁R V T ▁in ▁patients ▁who ▁have ▁under g one ▁ren al ▁trans plant ation . ▁CT ▁ang i ography ▁is ▁currently ▁the ▁top ▁choice ▁in ▁diagn osing ▁R V T . ▁It ▁is ▁non - in vas ive , ▁relatively ▁cheap ▁and ▁fast ▁with ▁high ▁accuracy . ▁CT ▁sc anning ▁can ▁be ▁used ▁to ▁detect ▁ren al ▁en larg ement , ▁ren al ▁tum ors , ▁blood ▁flow ▁and ▁other ▁ren al ▁path ologies . ▁An ▁alternative ▁is ▁magnetic ▁reson ance ▁ang i ography ▁or ▁M RA . ▁It ▁is ▁non - in vas ive , ▁fast ▁and ▁avoid s ▁radiation ▁( un like ▁a ▁CT ▁scan ) ▁but ▁it ▁is ▁relatively ▁expensive . ▁M RA ▁produces ▁detailed ▁images ▁of ▁the ▁ren al ▁blood ▁flow , ▁ves icle ▁walls , ▁the ▁kid ne ys ▁and ▁any ▁surrounding ▁t issue . ▁An ▁inferior ▁ven oc av ography ▁with ▁select ive ▁ven ography ▁can ▁be ▁used ▁to ▁rule ▁out ▁the ▁diagn oses ▁of ▁R V T . ▁ ▁Tre at ment ▁S urg ery ▁to ▁remove ▁the ▁cl ot ▁is ▁possible , ▁but ▁rarely ▁performed . ▁In ▁the ▁past , ▁surg ical ▁removal ▁of ▁the ▁ren al ▁ve in ▁cl ot ▁was ▁the ▁primary ▁treatment ▁but ▁it ▁is ▁very ▁invas ive ▁and ▁many ▁comp lications ▁can ▁occur . ▁In ▁the ▁past ▁dec ades , ▁treatment ▁has ▁shift ed ▁its ▁focus ▁from ▁surg ical ▁inter vention ▁to