it a portion of the flexible pcb 76 and the second conventional pcb 82 extend generally perpendicular to the first conventional pcb 72 and parallel to the direction of x rays from the x ray tube 34 although this structure places the signal processing electronics 82 at a distance from the source of the x rays it has a number of drawbacks such structure undesirably increases the distance that the analog signals must travel to reach the signal processing electronics such structure also adds undesirable stack height radial height and mass to the entire x ray sensor signal processing assembly fig6 illustrates a ct machine 99 having a gantry 101 with a central opening 102 the gantry 101 rotates in direction 103 an x ray tube 104 is positioned on one side of the opening 102 an x ray sensing and signal processing apparatus 108 is positioned on the other side of the opening 102 x rays 105 a 105 b and 105 c from the x ray tube 104 travel through the opening 102 and any x ray penetrable object therein and strike the x ray sensing and signal processing apparatus 108 described in detail below fig7 is a side elevation view of the x ray sensing and signal processing apparatus 108 of fig6 the apparatus 108 comprises an x ray sensor assembly 110 that in this embodiment includes a scintillator assembly 120 scintillator assembly 120 has a plurality of scintillator pixels 122 separated by scintillator pixel gaps 124 a photo detector assembly 130 having a plurality of photo detector pixels 132 is positioned immediately below the scintillator assembly 120 photo detector pixels 132 correspond to the scintillator pixels 122 positioned immediately above them the photo detector 130.