Lim AKP, et al. - The relative efficacy of microvascular imaging in detecting low-grade inflammation in arthritis in comparison to power Doppler ultrasound (PDUS) was determined. Superb microvascular imaging (SMI) was shown to be a new Doppler technique that increased conspicuity of Doppler vascularity in symptomatic joints when compared to PDUS. In patients with arthritis, this technique enabled detection of low-grade inflammation not visualised with power Doppler.