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• W2131350556 abstract "<para xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> Coronary artery calcification (CAC) is quantified based on a computed tomography (CT) scan image. A calcified region is identified. Modified expectation maximization (MEM) of a statistical model for the calcified and background material is used to estimate the partial calcium content of the voxels. The algorithm limits the region over which MEM is performed. By using MEM, the statistical properties of the model are iteratively updated based on the calculated resultant calcium distribution from the previous iteration. The estimated statistical properties are used to generate a map of the partial calcium content in the calcified region. The volume of calcium in the calcified region is determined based on the map. The experimental results on a cardiac phantom, scanned 90 times using 15 different protocols, demonstrate that the proposed method is less sensitive to partial volume effect and noise, with average error of 9.5% (standard deviation (SD) of 5–7 <formula formulatype=inline><tex>${hbox {mm}}^3$</tex></formula> ) compared with 67% (SD of 3–20 <formula formulatype=inline> <tex>${hbox {mm}}^3$</tex></formula> ) for conventional techniques. The high reproducibility of the proposed method for 35 patients, scanned twice using the same protocol at a minimum interval of 10 min, shows that the method provides 2–3 times lower interscan variation than conventional techniques. </para>" @default.
• W2131350556 created "2016-06-24" @default.
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• W2131350556 date "2007-03-01" @default.
• W2131350556 modified "2023-09-26" @default.
• W2131350556 title "Volumetric Quantification of Atherosclerotic Plaque in CT Considering Partial Volume Effect" @default.
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• W2131350556 doi "https://doi.org/10.1109/tmi.2007.893344" @default.
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