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DTS reconstruction of head-and-neck patient data using prior based and FBP based methods with 60°–90° scan angles. The angulations of the bony structures in CBCT and DTS images were evaluated by calculating the angle alpha between the neck bone and the horizontal line. (a) The prior CBCT image CBCTprior, (b) the new CBCT image CBCTnew, (c) prior based 60° DTSnew, (d) prior based 90° DTSnew, (e) FBP based 90° DTSnew.
