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HU offset (measured HU minus expected HU) using Catphan. Standard HU value: Teflon (990), Delrin (340), Acrylic (120), Polysterene (−35), LDPE (−100), PMB (−200), Air (−1000). (a) Filtered back projection reconstruction for all available kV CBCT scanning protocols. (b) Iterative reconstruction for eight available protocols. [Color figure can be viewed at wileyonlinelibrary.com]
