Quantitative Doppler in musculoskeletal ultrasonography - suboptimal performance of both experienced and in-training sonographers in selection of the highest Doppler signal image from cine-loops.

Aims: Doppler ultrasonography assessment is mandatory nowadays for the complete description of rheumatic disease activity. Initially it was performed in semi quantitative way but recently the (fully) quantitative assessment is gaining more interest. In quantitative assessment, the ratio between total colorized and total pixels (CTR) is computed for the whole image or just for the region of interest (ROI).