Overview of all bolometer lines of sight for ITER with envelopes of port cameras highlighted in yellow. Cameras and lines of sight are distributed all over the ITER vessel; for this schematic all of them have been projected into one poloidal plane. © Adam Pataki, IPP
Compared to other tomography applications (such as medical X-ray tomography), 500 lines of sight is a small number, and can produce only a relatively coarse tomographic image without any prior knowledge of the patterns to detect. By contrast, tomography performed on the human brain uses millions as it moves a camera with thousands of lines of sight incrementally around the cranium, producing a very sharp picture without any prior knowledge of the patterns to reconstruct.
Bolometer sensor prototypes for ITER after 10 thermal cycles at 400 °C, view onto absorber side on the left and onto meander side on the right. © Stefan Schmitt, Fraunhofer-IMM