Skip to main content
. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Magn Reson Med. 2013 Oct 7;72(3):689–698. doi: 10.1002/mrm.24977

Figure 4.

Figure 4

A schematic of the image analysis to quantify the motion effect in perfusion images. (a) Epicardium and endocardium contours are drawn on all the slices, (b) For each epicardium contour, the area is calculated and an approximate center point is estimated. Then, differences in area and center point location are calculated between each two successive time frames. If the breathing motion results in in-plane motion, we expect to see a shift in the center point but not the area. However, if it results in through-plane motion, we expect to see a different area, because a different slice was imaged, (c) The drawn endocardium contours are used to calculate the signal curves in two methods: 1) fixed-ROI, where the contour drawn at the contrast arrival point is propagated through all frames and the average intensity is calculated from the images; and 2) tracked-ROI, where the average intensity is calculated in each dynamic slice using the contour that was drawn specifically for that dynamic.