a multi - layered mega - voltage digital imager is disclosed . in one embodiment , the radiation to particle conversion and particle to electricity conversion is paired as a modular entity . the entity is replicated on top of each other as a layered unit to build an imager with increased resolution and efficiency . due to this paired replication , sub - images from each replicated pair may be selectively combined and processed to enhance the quality of the image . by varying and adding components at each layer , a different dose rate , and increased resolution , energy sensitivity and efficiency are achieved . the multilayered approach is cost effective and removes problems associated with traditional high efficient mv imagers used for high energy radiations .