Cone beam imagers

• Toshiba developing 256 x 0.5 mm row scanner (4D CT)

• Siemens have shown images from digital flat panel detector based scanner

• GE have shown work with flat panels in the past

• Problems with flat panels with readout rate (<100 /s, need >800 views/rot)

• Problems with scatter in z-axis?

  • Toshiba report ~ 6% scatter for 128mm long detector in head scan, ~ 13% for body image*