An example of measuring excess scan above (25 mm) and below (41 mm) the coronary arteries. The most superior aspect of the coronary arteries and the most inferior aspect of the coronary arteries were defined on axial images. These were cross-referenced with the coronal reformatted images shown here. The maximum distance above and below the coronary arteries is then measured. These measurements are then added to obtain the total excess scan length with a 10mm tolerance.