Dual-energy CT: Technical considerations and clinical applications

Area of Science:

• Radiology
• Medical Imaging
• Computed Tomography

Background:

• Dual-energy CT (DECT), first described in 1973, is currently underutilized in clinical settings.
• There is a need to highlight the clinical advantages and technical constraints of DECT.

Purpose of the Study:

• To review the clinical benefits of DECT.
• To discuss the technical limitations of DECT.
• To promote a better understanding and wider adoption of DECT in clinical practice.

Main Methods:

• Review of clinical applications and technical aspects of dual-energy CT.
• Discussion of image post-processing techniques, including iodine mapping and material decomposition.
• Analysis of DECT's utility in characterizing tumors, lung perfusion, pulmonary nodules, and treatment response.

Main Results:

• DECT enables quantitative iodine mapping for improved tumor characterization, lung perfusion assessment, and evaluation of treatment response.
• Virtual monoenergetic images and virtual non-contrast/non-calcium images can be generated.
• Material decomposition allows for the separation of substances like uric acid, fat, and the elaboration of hepatic iron overload maps.

Conclusions:

• DECT provides valuable quantitative data and versatile imaging options beyond conventional CT.
• Enhanced understanding of DECT's benefits and limitations is crucial for expanding its clinical application.
• Further integration of DECT into routine practice can improve diagnostic accuracy and patient management.