As shown in Figure 6 and Table 3, the diagnostic performance of combining susceptibility values in the RN and NfL levels (AUC: 0.904) was higher than that of the susceptibility value in the RN (AUC: 0.829) or blood NfL levels (AUC: 0.810) in the differentiation of PSP from PD patients, the sensitivity was 92.9% and specificity was 83.0% when the logit P is greater than or equal to 0.247. Here, NEFL is linked to Parkinson disease.