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CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2019; 29(03): 289-298
DOI: 10.4103/ijri.IJRI_241_19
Recent Advances

Applications of dual energy CT in clinical practice: A pictorial essay

Parang S Sanghavi
Jankharia Imaging Centre, Mumbai, Maharashtra, India
,
Bhavin G Jankharia
Jankharia Imaging Centre, Mumbai, Maharashtra, India
› Institutsangaben Financial support and sponsorship Nil.
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Abstract

In dual-energy CT (DECT), two different x-ray spectra are used to acquire two image datasets of the same region, to allow the analysis of energy-dependent changes in the attenuation of different materials. Each type of material demonstrates a relatively specific change in attenuation between images obtained with a high-energy spectrum and those obtained with a low-energy spectrum. Based on the relatively specific change in attenuation with two different energies, material composition information can be obtained to allow tissue characterization. The DECT ability of material differentiation allows bone removal in various CT angiography studies and bone marrow edema depiction, while with material optimization, metal artefacts can be significantly reduced to almost nil. DECT allows material separation to differentiate uric acid crystals from calcium to determine the composition of urinary calculi and to diagnose gout. Using the DECT ability of material decomposition, iodine maps can be generated, which are useful in the evaluation of any enhancing lesion in the body without the need to obtain a plain scan and allow perfusion maps to be created in cases of pulmonary thromboembolism.

Keywords

Dual energy CT - iodine map - material - metal artefact - uric acid


Publikationsverlauf

Eingereicht: 03. Juni 2019

Angenommen: 08. Oktober 2019

Artikel online veröffentlicht:
22. Juli 2021

© 2019. Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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