dual-energy CT
Also written as: DECT
A CT technique using two different X-ray energy levels to improve tissue characterization and enable material decomposition.
Full Definition
Dual-energy CT (DECT) is an advanced imaging technique that acquires data at two different X-ray energy levels, enabling improved tissue characterization and material decomposition beyond conventional single-energy CT. In cardiovascular imaging, DECT offers several advantages including improved contrast-to-noise ratio, reduction of beam-hardening artifacts, and the ability to generate virtual non-contrast images from contrast-enhanced studies. DECT can help differentiate iodine from calcium, reduce metal artifacts from stents or pacemakers, and optimize contrast enhancement. The technique also enables creation of material-specific images such as iodine maps and virtual monoenergetic images that can improve diagnostic confidence in challenging cases.
Usage
Usage note: Specify the dual-energy technique used and any post-processing applications; distinguish from dual-source scanning.
In Context
- "Dual-energy CT enabled creation of virtual non-contrast images, eliminating the need for a separate unenhanced acquisition." — Radiology protocol note
- "DECT iodine maps demonstrated improved conspicuity of the perfusion defect compared to conventional images." — CT perfusion report