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. 2019 Aug 7;2019:7659239. doi: 10.1155/2019/7659239

Figure 1.

Figure 1

The aortic arch calcification (AAC) extent in four-point scale and distribution of AAC grades on a chest X -ray. (a) The extent of AAC on a chest X-ray was divided into four grades: grade 0, no visible calcification (panel A); grade 1, small spots of calcification or a single thin area of calcification of the aortic knob (panel B); grade 2, one or more areas of thick calcification (panel C); grade 3, circular calcification of the aortic knob (panel D). (b) Distribution of AAC grades on chest X-ray in all subjects.