A system transformable to image a subject in at least two configurations, comprising: a gantry member extending from a first gantry terminal end to a second gantry terminal end ; a rotor having: a fixed length segment having a "C" shape with a first terminal end and a second terminal end and a first sidewall having a first external edge opposed to a second sidewall having a second external edge, wherein a volume is at least partially formed between the first sidewall and the second sidewall; a source connected at a first positon within the volume; a detector connected at a second position on the fixed length segment within the volume and substantially opposed to the source ; one or more moveable segments, including a first moveable segment extending from a first segment end to a second segment end; the system further comprising: a rotor drive operably connected to the gantry member and the rotor to move the rotor relative to the gantry member ; wherein the source and the detector move with the rotor relative to the gantry member when the rotor drive drives the rotor relative to the gantry member ; characterized in the rotor further comprising a segment drive coupled between the fixed length segment and the one or more moveable segments, wherein the segment drive is configured to move the one or more moveable segments relative to the fixed length segment both in a curved path and in a linear path radially from the center of the fixed length segment between an open configuration substantially in the "C" shape and a closed configuration in an "O" shape. a gantry member extending from a first gantry terminal end to a second gantry terminal end ; a rotor having: a fixed length segment having a "C" shape with a first terminal end and a second terminal end and a first sidewall having a first external edge opposed to a second sidewall having a second external edge, wherein a volume is at least partially formed between the first sidewall and the second sidewall; a source connected at a first positon within the volume; a detector connected at a second position on the fixed length segment within the volume and substantially opposed to the source ; one or more moveable segments, including a first moveable segment extending from a first segment end to a second segment end; a fixed length segment having a "C" shape with a first terminal end and a second terminal end and a first sidewall having a first external edge opposed to a second sidewall having a second external edge, wherein a volume is at least partially formed between the first sidewall and the second sidewall; a source connected at a first positon within the volume; a detector connected at a second position on the fixed length segment within the volume and substantially opposed to the source ; one or more moveable segments, including a first moveable segment extending from a first segment end to a second segment end; a rotor drive operably connected to the gantry member and the rotor to move the rotor relative to the gantry member ; wherein the source and the detector move with the rotor relative to the gantry member when the rotor drive drives the rotor relative to the gantry member ; characterized in the rotor further comprising a segment drive coupled between the fixed length segment and the one or more moveable segments, wherein the segment drive is configured to move the one or more moveable segments relative to the fixed length segment both in a curved path and in a linear path radially from the center of the fixed length segment between an open configuration substantially in the "C" shape and a closed configuration in an "O" shape. <EOS>