Abstract: PREPARATION OF 153SmRESIN MICROSPHERES AND DETERMINATION OF FEMORAL HEAD BLOOD FLOW IN RABBITSBai Hongsheng Cheng Zhen Jin Xiaohai Du Jin Wang FanChen Daming Fan Hongqiang(Department of Isotope, China Institute of Atomic Energy, Beijing 102413)Zhang Nianfei Yang Lianfa Li Zirong(China and Japan Friendship Hospital, Beijing 100029)ABSTRACT153Smresin microspheres(RMS) is prepared. Effect of pH value and reaction time on the resin absoptance and stability of 153SmRMS in vitro are investigated. Meanwhile, the femoral head blood flow of rabbits is determined with 153SmRMS， and the improvememt of the femoral blood flow in rabbits receiving steroid using lipidclearing agent is evaluated.Key words 153 Sm resin microspheres(153SmRMS) blood flow osteonecrosis of femoral head