Figure 1.

Different performance of the power Doppler ultrasound modality of two machines in one patient. (A) Machine B, presence of a positive power Doppler signal (arrow) within the region of synovial proliferation. (B) Machine A, this signal is absent. Arrowhead, vessel; *noise on cortical surface.

Ten Cate et al. Arthritis Research & Therapy 2013 15:R162   doi:10.1186/ar4345
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