Fig. 1

Relationship between labeling efficiency and its influence factors. a Effect of the preparation of glucose deprivation before labeling on labeling efficiency (labeling time, 30 min; n = 4). b Relationship between hematocrit for labeling and labeling efficiency. A positive linear correlation was found (some dots overlap). c Relationship between labeling time with ¹⁸F-FDG and labeling efficiency (glucose deprivation time, 60 min; n = 3). d Relationship between labeling time with ¹⁸F-FDG and the percentage of the actual radioactivity of ¹⁸F-FDG-labeled RBCs per the initial dose (the same data as Fig. 1c expressed without decay correction)