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. 2021 Dec 16;11(12):2376. doi: 10.3390/diagnostics11122376

Figure 5.

Figure 5

Bar chart show detectability indices (d’) of non-calcified atherosclerotic plaque with an object-to-background contrast |ΔHU| of 450 HU and CTDI = 10 mGy in the small (a), medium (b), and large sized (c) phantom setup. A d’ of 2 corresponds to 90% accuracy (AUC). The SPCCT consistently provided higher detectability indices than the conventional system. Note that at large phantom size, only the PCD-CT system could accurately detect (i.e., with a d’ ≥ 2 indicating an AUC of 90%) the smallest simulated plaque (0.5 mm). CTDI—computed tomography dose index; PCD-CT—photon-counting detector computed tomography. CTDI—computed tomography dose index; EID-CT—energy-integrating detector computed tomography; AUC—area under the curve.