Computed tomography imaging spectrometer

The CTIS was conceived separately by Takayuki Okamoto and Ichirou Yamaguchi at Riken (Japan), and by F. Bulygin and G. Vishnakov in Moscow (Russia).

[1][2][3] The concept was subsequently further developed by Michael Descour, at the time a PhD student at the University of Arizona, under the direction of Prof. Eustace Dereniak.

[4] The first research experiments based on CTIS imaging were conducted in the fields of molecular biology.

[5] Several improvements of the technology have been proposed since then, in particular regarding the hardware: dispersive elements providing more information on the datacube,[6] enhanced calibration of the system.

[8] For academic purposes, although not as widely used as other spectrometers, CTIS has been employed in applications ranging from the military[9] to ophthalmology[10] and astronomy.

Finally, a re-imaging lens maps the dispersed image of the field stop onto a large-format detector array.

The optical layout and reconstruction step of a CTIS instrument. Shown here is an example in which the device is imaging the university of Arizona's logo, uses a kinoform grating to disperse the transmitted light, and measures a 3 × 3 dispersion pattern on the detector array.
Formation of a CTIS image, viewed as mechanical projections of a theoretical datacube. Image inspired by the work of Descour. [ 12 ]
Image of a CTIS acquisition. The acquired object is a number written on a transparent screen, illuminated by a LED light.