Fig. 4
From: Role of uterine artery Doppler in assessment of unexplained infertility
a, b Transvaginal Doppler ultrasound of both uterine arteries (a right, b left) of fertile female (control group) aged 25 years old shows RI of right and left uterine arteries were 0.58 and 0.58 with mean RI 0.58, S/D ratios of right and left uterine arteries were 2.49 and 2.36 respectively with mean S/D ratio 2.42, and PI of right and left uterine arteries were 1.1 and 1.96 respectively with mean PI 1.53