Figure 25

Spin-echo blood flow artefacts. a-b) Past example of blood flow artefacts on a conventional spin-echo sequence of a transverse slice through the great vessels above the heart: a) image acquired in diastole, b) image acquired in systole showing reduced flow artefacts due to increased intra-voxel dephasing and time of flight effects. c) The introduction of faster segmented acquisitions with black blood preparation avoids this problem, this example shows a similar transverse plane acquired with a HASTE sequence.