Load the CBV images into the Sequence Tool. Please ensure that the x, y and z scales in the Sequence Tool are as they were in the original data from which they were estimated (if they are not, insert them manually, and click on ``First''). Press the ``CBV volume'' button on the Flow Tool to ensure the sequence is held in memory. Next, load the TTM images into the Sequence Tool. Please ensure the TTM sequence has the same number (and same correspondence) of images as the CBV sequence, and ensure that the x, y and z scales are correct. Press the ``TTM volume'' button to hold these images in memory.