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(a), a cross section of the anthropomorphic phantom with the rubber and wood inserts placed throughout the lungs. #104 is the rubber insert. #107 is the sycamore wood. (b), axial CT scan of the phantom cross section displayed on the left. The regions of higher electron density are brighter in the image and the regions of lower electron density are not as bright. (c) Cross section shows the placement of ROIs on each of the inserts.
