Spotty calcifications are formally defined as <3/2 of vessel diameter in length (i.e. along vessel long axis) & <2/3 of vessel diameter in width (i.e. perpendicular to vessel long axis), but it may be easier to just remember that they are small relative to the vessel. In fact, some definitions of spotty calcifications specify that they should be <3 mm in greatest dimension. As with all coronary calcifications, CT density should be ≥130 HU.