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Figure 2 Computed tomography (CT) density values for hypoechoic, hyeperechoic, and calcified plaques. Each box describes the distribution of density values within one SD. The whiskers above and below each box are describing the range between the lowest and highest observed density value. The differences of the mean CT density values between hypoechoic, hyperechoic, and calcified plaques were significant with a p value <0.02.