Fig. 2

a Visualisation of constant flow inside the phantom vessel with time-resolved 3D pathlines (red). The yellow plane represents the measuring plane depicted in b. b Phase-contrast images obtained with the k-t-GRAPPA5 sequence showing a cross-section through the phantom vessel on the same level as in a. c Cross-section of the phantom vessel on a k-t-GRAPPA5 image subdivided into seven circular sectors. d Distribution of the flow velocities in the constant flow phantom within the seven circular sectors defined in c demonstrates a parabolic shape with higher flow velocities in the centre. cm/s, centimetres per second