Single-Scan Half-Fan DECT Using Static Detector Modulation: A Preliminary Study

Compared with commercial dual-energy computed tomography (DECT) solutions, beam modulation is an economical and efficient alternative to achieve single-scan DECT which can be enabled with conventional diagnostic or cone-beam CT machines. Existing beam modulation methods employ regularization strategy for DECT reconstruction, which cannot handle the half-fan mode due to inevitable data loss in each spectrum. Besides, all previous works employ primary - modulation scheme, leading to magnified penumbra area in the detector side. In this work, a dedicated beam modulator is attached to the detector surface to realize dual-energy projection acquisition during a single scan. Then the detectormodulated sinogram is fed into the pre-trained pix2pix GAN model to generate full-sampled sinograms at high- and low-energy spectra. Analytical reconstruction and material decomposition can be subsequently implemented using the complete dual-energy sinogram data.