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. 2020 Aug 12;9(16):e016883. doi: 10.1161/JAHA.120.016883

Figure 1. Planning of the 2D phase contrast velocity measurements on different segments of the internal carotid artery.

Figure 1

A and B, Coronal and sagittal oriented phase contrast angiography surveys used to plan the 2D phase contrast velocity measurements at C1 (blue line) and C3 (red) segments. The planning of the C7 (yellow) segment is also illustrated in the phase contrast angiography surveys. Planning of the C7 segment was fine‐tuned using a maximum intensity projection of the 3D time‐of‐flight angiogram (C and D). C, Until February 2019, a single 2D phase‐contrast measurement was used for simultaneous assessment of both right and left internal carotid artery. D, From February 2019 until October 2019, the phase‐contrast velocity measurements of the right and left internal carotid artery at C7 segments were planned separately to compensate for the slightly diverging angle at C7 level.