Comparison of low-energy virtual monoenergetic images between photon-counting CT and energy-integrating detectors CT: A phantom study - 01/09/24
, Sebastian Faby b, Maxime Pastor a, Julien Frandon a, Julien Erath b, Jean Paul Beregi a, Djamel Dabli aHighlights |
• | Image quality and radiation dose reduction obtained with a photon-counting CT system were compared with those of an energy-integrating dual-source CT system on virtual monoenergetic image at low-energy levels for abdominal CT images. |
• | By comparison with an energy-integrating dual-source CT, photon-counting CT reduces noise magnitude and improves noise texture, spatial resolution and detectability on virtual monoenergetic images for all low-keV levels. |
• | This phantom study shows that photon-counting CT may offer great potential for dose reduction in patients undergoing dual-energy CT of the abdomen. |
Abstract |
Purpose |
The purpose of this study was to assess image quality and dose level using a photon-counting CT (PCCT) scanner by comparison with a dual-source CT (DSCT) scanner on virtual monoenergetic images (VMIs) at low energy levels.
Materials and methods |
A phantom was scanned using a DSCT and a PCCT with a volume CT dose index of 11 mGy, and additionally at 6 mGy and 1.8 mGy for PCCT. Noise power spectrum and task-based transfer function were evaluated from 40 to 70 keV on VMIs to assess noise magnitude and noise texture (fav) and spatial resolution on two iodine inserts (f50), respectively. A detectability index (d’) was computed to assess the detection of two contrast-enhanced lesions according to the energy level used.
Results |
For all energy levels, noise magnitude values were lower with PCCT than with DSCT at 11 and 6 mGy, but greater at 1.8 mGy. fav values were higher with PCCT than with DSCT at 11 mGy (8.6 ± 1.5 [standard deviation [SD]%), similar at 6 mGy (1.6 ± 1.5 [SD]%) and lower at 1.8 mGy (-17.8 ± 2.2 [SD]%). For both inserts, f50 values were higher with PCCT than DSCT at 11- and 6 mGy for all keV levels, except at 6 mGy and 40 keV. d’ values were higher with PCCT than with DSCT at 11- and 6 mGy for all keV and both simulated lesions. Similar d' values to those of the DSCT at 11 mGy, were obtained at 2.25 mGy for iodine insert at 2 mg/mL and at 0.96 mGy for iodine insert at 4 mg/mL at 40 keV.
Conclusion |
Compared to DSCT, PCCT reduces noise magnitude and improves noise texture, spatial resolution and detectability on VMIs for all low-keV levels.
Le texte complet de cet article est disponible en PDF.Keywords : Dual-energy, Multidetector computed tomography, Photon counting CT, Task-based image quality assessment, Iterative reconstruction
Abbreviations : BMMI2, BMMI4, CT, CTDIvol, d', DECT, DSCT, EID, HU, NPS, PCCT, PCD, TTF, VMI
Plan
Vol 105 - N° 9
P. 311-318 - septembre 2024 Retour au numéro
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