▁in ▁less ▁than ▁ 1 0 ▁minutes . ▁With ▁S PE CT , ▁inferior ▁and ▁posterior ▁ab normal ities ▁and ▁small ▁areas ▁of ▁inf ar ction ▁can ▁be ▁identified , ▁as ▁well ▁as ▁the ▁occ l ud ed ▁blood ▁vessels ▁and ▁the ▁mass ▁of ▁inf ar cted ▁and ▁vi able ▁my oc ard ium . ▁The ▁usual ▁is ot op es ▁for ▁such ▁studies ▁are ▁either ▁ ▁Th al li um - 2 0 1 ▁or ▁ ▁Te ch net ium - 9 9 m . ▁ ▁History ▁The ▁history ▁of ▁nuclear ▁card i ology ▁began ▁in ▁ 1 9 2 7 ▁when ▁Dr . ▁Her rm ann ▁Bl um gart ▁developed ▁the ▁first ▁method ▁for ▁meas uring ▁card iac ▁strength ▁by ▁inject ing ▁subjects ▁with ▁a ▁radio active ▁comp ound ▁known ▁as ▁ ▁Rad ium ▁C ▁( 2 1 4 Bi ). ▁The ▁subst ance ▁was ▁inject ed ▁into ▁the ▁ven ous ▁system ▁and ▁travel led ▁through ▁the ▁right ▁heart ▁into ▁the ▁l ungs , ▁then ▁into ▁the ▁left ▁heart ▁and ▁out ▁into ▁the ▁ar ter ial ▁system ▁where ▁it ▁was ▁then ▁detected ▁through ▁a ▁Wilson ▁chamber . ▁The ▁Wilson ▁chamber ▁represented ▁a ▁primitive ▁sc int ill ation ▁counter ▁which ▁could ▁measure ▁radio activity . ▁Me as ured ▁over ▁time , ▁this ▁sequ ential ▁ac quisition ▁of ▁radio activity ▁produced ▁what ▁was ▁known ▁as ▁" cir cul ation ▁time ". ▁The ▁longer ▁the ▁" cir cul ation ▁time ", ▁the ▁we aker ▁the ▁heart . ▁Bl um gart ' s ▁emphas is