Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Impact of Phantom Size on Low-Energy Virtual Monoenergetic Images of Three Dual-Energy CT Platforms

Joël Greffier
* ORCID logo ,
Claire Van Ngoc Ty
ORCID logo ,
Isabelle Fitton
ORCID logo ,
Julien Frandon
ORCID logo ,
Jean-Paul Beregi
,
Djamel Dabli
ORCID logo
Version 1 : Received: 5 August 2023 / Approved: 7 August 2023 / Online: 8 August 2023 (03:33:22 CEST)

A peer-reviewed article of this Preprint also exists.

Greffier, J.; Van Ngoc Ty, C.; Fitton, I.; Frandon, J.; Beregi, J.-P.; Dabli, D. Impact of Phantom Size on Low-Energy Virtual Monoenergetic Images of Three Dual-Energy CT Platforms. Diagnostics 2023, 13, 3039. Greffier, J.; Van Ngoc Ty, C.; Fitton, I.; Frandon, J.; Beregi, J.-P.; Dabli, D. Impact of Phantom Size on Low-Energy Virtual Monoenergetic Images of Three Dual-Energy CT Platforms. Diagnostics 2023, 13, 3039.

Abstract

To compare the quality of low-energy VMIs obtained with three DECT platforms according to phantom diameter. Three sections of the Mercury Phantom 4.0 were scanned on two generations of split-filter CTs (SFCT-1st and SFCT-2nd) and on one Dual-source CT (DSCT). Noise power spectrum (NPS), task-based transfer function (TTF) and detectability index (d’) were assessed on VMIs from 40 to 70keV. Highest noise magnitude values were found with SFCT-1st and noise magnitude was higher with DSCT than with SFCT-2nd for 26-cm (10.2±1.3%) and 31-cm (7.0±2.5%), and the opposite for 36-cm (-4.2±2.5%). The highest average NPS spatial frequencies and TTF values at 50% (f50) values were found with DSCT. For all energy levels, f50 values were higher with SFCT-2nd than SFCT-1st for 26-cm (3.2±0.4%) and the opposite for 31-cm (-6.9±0.5%) and 36-cm (-5.6±0.7%). The lowest d’ values were found with SFCT-1st. For all energy levels, d’ values were lower with SFCT-2nd than with DSCT for 26-cm (-6.2±0.7%), similar for 31-cm (-0.3±1.9%) and higher for 36-cm (5.4±2.7%). In conclusion, compared to SFCT-1st, SFCT-2nd exhibited lower noise magnitude and higher detectability values. Compared with DSCT, SFCT-2nd had lower noise magnitude and higher detectability for the 26-cm but the opposite was true for the 36-cm.

Keywords

Dual-energy; Multidetector Computed tomography; Task-based image quality assessment; Split-filter

Subject

Medicine and Pharmacology, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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