US 2006067458 A1 abstract a data consistency condition is derived for an array of attenuation values acquired with a fan beam x ray ct system using this data consistency condition estimates of selected attenuation values can be calculated from the other attenuation values acquired during the scan such estimates reduce artifacts caused truncated data and by loss of data due to x ray absorption application_number US 95545904 A description with initial reference to fig1 a computed tomography ct imaging system 110 includes a gantry 112 representative of a u201c third generation u201d ct scanner gantry 112 has an x ray source 113 that projects a fan beam of x rays 114 toward a detector array 116 on the opposite side of the gantry the detector array 116 is formed by a number of detector elements 118 which together sense the projected x rays that pass through a medical patient 115 each detector element 118 produces an electrical signal that represents the intensity of an impinging x ray beam and hence the attenuation of the beam as it passes through the patient during a scan to acquire x ray projection data the gantry 112 and the components mounted thereon rotate about a center of rotation 119 located within the patient 115 the rotation of the gantry and the operation of the x ray source 113 are governed by a control mechanism 120 of the ct system the control mechanism 120 includes an x ray controller 122 that provides power and timing signals to the x ray source 113 and a gantry motor controller 123 that controls the rotational speed and position of the gantry 112 a data acquisition system das 124 in the control mechanism 120 samples analog data from detector elements 18 and.