Diagnostic and Interventional Radiology
Modality-based (US, CT, MRI, PET-CT) Imaging-Technical Note

Technical background of a novel detector-based approach to dual-energy computed tomography


Department of Diagnostic and Interventional Radiology, University Hospital Cologne, Institute for Diagnostic and Interventional Radiology, Cologne, Germany


Philips Healthcare, R&D CT Innovation, Haifa, Israel


Department of Radiology, University Hospital of Heidelberg, Heidelberg, Germany


Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA

Diagn Interv Radiol 2020; 26: 68-71
DOI: 10.5152/dir.2019.19136
Read: 97 Downloads: 31 Published: 03 September 2019



Dual-energy information in computed tomography can be obtained through different technical approaches. Most available scanner designs acquire examination with two different X-ray spectra. Recently, the first detector-based approach became clinically available. Upfront, physical principles of dual-energy CT are reviewed, including the interaction of photons with matter in terms of the Photoelectric effect and Compton scattering. In addition, available concepts to dual energy computed tomography are described. Afterwards, the spectral detector CT system is described in detail. The design of the of the stacked detector design and its inherent technical advantages and disadvantages are discussed. Further, the principles of image reconstruction, their possibilities and limitations are referred. The increase in reconstructions and data pose some challenges to both, clinical and technological workflow which are hereafter addressed. Finally, the detector-based approach is discussed in light of other, emission-based DECT approaches.

You may cite this article as: Große Hokamp N, Maintz D, Shapira N, Chang DH, Noël PB. Technical background of a novel detector-based approach to dual-energy computed tomography. Diagn Interv Radiol 2020; 26:68–71.

EISSN 1305-3612