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Table 2 The optimized thresholds for detecting IPH

From: Semi-automatic carotid intraplaque hemorrhage detection and quantification on Magnetization-Prepared Rapid Acquisition Gradient-Echo (MP-RAGE) with optimized threshold selection

Data subset AUC Optimized threshold
  IPH Area (mm2)a n+/nb SCM Adjacent muscle Median SCM Adjacent muscle Median
With CA >0 63/133 0.69 0.71 0.58 1.0 1.6 2.2
>1.25 52/122 0.71 0.72 0.64 1.0 1.6 2.2
>2.80 34/104 0.74 0.79 0.68 1.0 1.6 2.2
No CAc >0 49/119 0.74 0.71 0.66 1.0 1.7 2.2
>1.25 40/110 0.76 0.71 0.72 1.0 1.7 2.2
>2.80 25/95 0.83 0.80 0.80 1.0 1.6 2.2
  1. AUC area under the ROC curve, IPH intraplaque hemorrhage, ROC Receiver operating characteristic, SCM sternocleidomastoid muscle
  2. aIPH area: excluding IPH with areas < π (0.63x)2, where 0.63 mm was the in-plane resolution of MP-RAGE, and x was set as 1 and 1.5 which gave areas of 1.25 and 2.80
  3. bn+: number of slices with IPH present in histology; n:total number of slices
  4. cNo CA: excluding heavily (>50 %) calcified IPH; with CA: not excluding heavily calcified IPH