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. Author manuscript; available in PMC: 2015 Nov 7.
Published in final edited form as: J Biomech. 2014 Sep 28;47(14):3475–3481. doi: 10.1016/j.jbiomech.2014.09.010

Figure 3.

Figure 3

Schematic diagram comparing the timing for the standard tagging approach and proposed double trigger approach (one rotation is shown). The subject initiates the motion by releasing a latch on the head rotation device. Assisted by a counterweight, the subject rotates his or her head towards the left until the head support encounters a fixed stop at 32°. The sequence is triggered when the subject initiates the motion, and the tag lines are then applied. For the standard approach, the cine image acquisition begins immediately after the application of tag lines. For the proposed approach, the cine acquisition begins after the subject rotates through a preset threshold of 29°. An MRI-compatible angular position sensor generates the trigger when this threshold is reached.