Computed tomography using a terahertz quantum cascade laser and quantum well photo-detector

Terahertz computed tomographic imaging has been performed based on an imaging system which includes a terahertz quantum cascade laser as the light source and a terahertz quantum well photo-detector. The main reconstruction methods of filtered back projection, iterative analysis and the wavelet reconstruction technique are adopted and compared. The reconstructed quality has been discussed with respect to projection numbers, contrast and geometric preservation. We have applied parameter structural similarity to quantitatively analyze the image quality at the end.