FN1 and polycystic ovary syndrome: The combination of ADC value and FN for distinguishing between PCOS patients and controls resulted in a combined diagnostic AUC of 0.94 (95% CI: 0.90–0.98), with an NRI of 0.19 (95% CI: 0.07–0.30; p = 0.001) and an IDI of 0.12 (95% CI: 0.07–0.17; p < 0.001) compared to FN along.