2.3. Matching experiment
In the paired-design experimental study, each subject would be subjected to the robot measurement and control measures in a certain order through a randomized process. A comparison trial was conducted in the morning or afternoon (within 15–24 h) on the second day after patients received radionuclide therapy (e.g., a dose of 131I drug was normally administered between 2:00 and 4:00 p.m.). Because the research results of two treatments can be obtained from the same individual and the influence of other factors can be effectively controlled, the research results are more comparable. Compared with the parallel control method, the number of subjects can be reduced, which is an effective control method.