  We have been developing a semiconductor Compton telescope to explore the
universe in the energy band from several tens of keV to a few MeV. We use a Si
strip and CdTe pixel detector for the Compton telescope to cover an energy
range from 60 keV. For energies above several hundred keV, the higher
efficiency of CdTe semiconductor in comparison with Si is expected to play an
important role as an absorber and a scatterer. In order to demonstrate the
spectral and imaging capability of a CdTe-based Compton Telescope, we have
developed a Compton telescope consisting of a stack of CdTe pixel detectors as
a small scale prototype. With this prototype, we succeeded in reconstructing
images and spectra by solving the Compton equation from 122 keV to 662 keV. The
energy resolution (FWHM) of reconstructed spectra is 7.3 keV at 511 keV and 3.1
keV at 122 keV, respectively. The angular resolution obtained at 511 keV is
measured to be 12.2 degree (FWHM).
