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(A) Power Doppler ultrasound and (B) superb microvascular imaging, examination of parotid gland in a 37-year-old patient with primary Sjögren syndrome. An superb microvascular imaging of the patient (B) shows a substantially higher amount of blood fl ow (VI, 4.3%) compared with the power Doppler ultrasound image of the patient (A; VI, 1.4%).
