A vertical radiation sensitive detector array, comprising: processing electronics; and at least one detector leaf comprising: a support carries including a radiation shielding material; a scintillator array (210, 502, 807, 907), including, at least, a top side which receives radiation, a bottom side and a rear side, the processing electronics being disposed below the scintillator array; a photo-sensor circuit board (200, 803, 903), including a photo-sensitive region (202, 508, 803, 903), optically coupled to the rear side of the scintillator array, and a signal transferring region, the photo-sensor circuit board being fixedly mounted to the support carrier, which shields the photo-sensor circuit board from impingent radiation; a flexible circuit board electrically coupling the photo-sensitive region and the processing electronics and including a first portion fixedly mounted to the signal transferring region and a second portion (226,228) corresponding to a support region moveably supported by the support carrier; and a radiation shield disposed below the bottom of the scintillator array, between the scintillator and the processing electronics and including one or more radiation opaque materials that attenuate x-ray photons passing through the scintillator array to an extent that the processing electronics are shielded from residual radiation passing through the scintillator array. processing electronics; and at least one detector leaf comprising: a support carries including a radiation shielding material; a scintillator array (210, 502, 807, 907), including, at least, a top side which receives radiation, a bottom side and a rear side, the processing electronics being disposed below the scintillator array; a photo-sensor circuit board (200, 803, 903), including a photo-sensitive region (202, 508, 803, 903), optically coupled to the rear side of the scintillator array, and a signal transferring region, the photo-sensor circuit board being fixedly mounted to the support carrier, which shields the photo-sensor circuit board from impingent radiation; a flexible circuit board electrically coupling the photo-sensitive region and the processing electronics and including a first portion fixedly mounted to the signal transferring region and a second portion (226,228) corresponding to a support region moveably supported by the support carrier; and a radiation shield disposed below the bottom of the scintillator array, between the scintillator and the processing electronics and including one or more radiation opaque materials that attenuate x-ray photons passing through the scintillator array to an extent that the processing electronics are shielded from residual radiation passing through the scintillator array. a support carries including a radiation shielding material; a scintillator array (210, 502, 807, 907), including, at least, a top side which receives radiation, a bottom side and a rear side, the processing electronics being disposed below the scintillator array; a photo-sensor circuit board (200, 803, 903), including a photo-sensitive region (202, 508, 803, 903), optically coupled to the rear side of the scintillator array, and a signal transferring region, the photo-sensor circuit board being fixedly mounted to the support carrier, which shields the photo-sensor circuit board from impingent radiation; a flexible circuit board electrically coupling the photo-sensitive region and the processing electronics and including a first portion fixedly mounted to the signal transferring region and a second portion (226,228) corresponding to a support region moveably supported by the support carrier; and a radiation shield disposed below the bottom of the scintillator array, between the scintillator and the processing electronics and including one or more radiation opaque materials that attenuate x-ray photons passing through the scintillator array to an extent that the processing electronics are shielded from residual radiation passing through the scintillator array.