ter , ▁known ▁today ▁as ▁the ▁father ▁of ▁inter vent ional ▁radi ology . ▁D ot ter ▁pione ered ▁the ▁understanding ▁of ▁c ath eter ▁st ented ▁ang i ography . ▁This ▁became ▁of ▁particular ▁interest ▁to ▁Jud kins ▁as ▁well ▁and ▁they ▁worked ▁together ▁to ▁study ▁and ▁develop ▁per cut aneous ▁transl um inal ▁dil at ation ▁of ▁narrow ed ▁peri pher al ▁ar ter ies . ▁This ▁procedure ▁pione ered ▁what ▁would ▁later ▁develop ▁into ▁contemporary ▁transl um inal ▁ang iop last y ▁techniques . ▁ ▁He ▁continued ▁his ▁understanding ▁of ▁ang i ography ▁at ▁the ▁Cleveland ▁C lin ic ▁under ▁Dr . ▁F . ▁Mason ▁S ones , ▁who ▁focused ▁on ▁ar ter i ography ▁via ▁the ▁bra ch ial ▁ar tery ▁and ▁then ▁at ▁the ▁University ▁of ▁Lund ▁in ▁Sweden ▁under ▁the ▁guidance ▁of ▁radi ologist ▁Dr . ▁S ven ▁S eld inger . ▁It ▁was ▁in ▁Sweden ▁where ▁he ▁helped ▁develop ▁the ▁" hook tail " ▁( U - sh aped ) ▁c ath eter ▁which ▁was ▁used ▁to ▁personal ize ▁each ▁guide ▁wire ▁and ▁c ath eter ▁to ▁the ▁shape ▁of ▁each ▁patient ' s ▁a ort a . ▁He ▁brought ▁these ▁new - found ▁techniques ▁back ▁to ▁U O MS ▁in ▁ 1 9 6 6 ▁and ▁started ▁working ▁to ▁simplify ▁the ▁procedure ▁to ▁perform ▁it ▁without ▁the ▁use ▁of ▁general ▁an est hes ia ▁to ▁decrease ▁the ▁comp lications ▁and ▁risk ▁associated . ▁At ▁this ▁time , ▁he ▁was ▁given ▁the ▁post ▁of ▁associate ▁professor