Table 1.

Strengths of Weaknesses of various DECT systems.

Technology	Advantages	Disadvantages
Dual source	Optimized image quality	Limited temporal and spatial resolution Small FOV *
Rapid kVp switching	Good temporal and spatial registration	Limited spectral separation High noise-to-signal ratio of low-energy images Requires specialized hardware
Dual layer detectors	Excellent temporal and spatial resolution	High spectral overlap Requires specialized hardware
Twin-beam filtration	Cost-effective Full spectral FOV * available for image acquisition	Temporal discrepancy between high- and low-energy data Cross-scatter Intrinsic lower energies due to filtration Overlapping spectra in center and edge of the beam
Dual spin	Cost-effective (can be performed on any scanner) Optimized tube current modulation Full spectral FOV * No cross scatter	Spectral distortion secondary to motion artefact

* FOV—Field of view.