Optimization of image quality and accuracy of low iodine concentration quantification as function of kVp pairs for abdominal imaging using dual-source CT: A phantom study

Djamel Dabli (1, 2) , Julien Frandon (1) , Aymeric Hamard (1, 3) , Asmaa Belaouni (1) , Takieddine Addala (1) , Jean-Paul Beregi (1, 4) , Joël Greffier (1)

1 CHU Nîmes - Centre Hospitalier Universitaire de Nîmes
2 EA 2992 - Caractéristiques féminines des dysfonctions des interfaces cardio-vasculaires
3 UM - Université de Montpellier
4 IMAGINE - Initial MAnagement and prevention of acute orGan failures IN critically ill patiEnts

Purpose: To determine the suitable kVp pair for optimal image quality of the virtual monochromatic images (VMIs) and iodine quantification accuracy at low concentration, using a third generation dual-source CT (DSCT).Materials and methods: Multi-energy CT phantoms with and without body rings were scanned with a DSCT using four kVp pairs (tube "A"/"B" voltage): 100/Sn150, 90/Sn150, 80/Sn150 and 70/Sn150 kVp. The reference mAs was adjusted to obtain a CTDIvol close to 11 mGy. HU values accuracy (RMSDHU), noise (SD) and contrast-to-noise ratio (CNR) of iodine inserts of 0.5, 1, 2 and 5 mg/mL concentrations were assessed on VMIs at 40/50/60/70 keV. Iodine quantification accuracy was assessed using the RMSDiodine and iodine bias (IBiodine).Results: The RMSDHU decreased when the tube "A" voltage increased. The mean noise value increased significantly with tube "A" voltage (p < 0.001) but decreased between 80/Sn150 and 90/Sn150 kVp for the small phantom (1.1 ± 0.1%; p = 0.047). The CNR significantly decreased with tube "A" voltage (p < 0.001), except between 80/Sn150 and 90/Sn150 kVp for all inserts and between 90/Sn150 kVp and 100/Sn150 kVp for the 1.0 and 0.5 mg/mL inserts in the large phantom. In the small phantom, no significant difference was found between 80/Sn150 kVp and 90/Sn150 kVp for all inserts and between 80/Sn150, 90/Sn150 and 100/Sn150 kVp for the 1 and 0.5 mg/mL inserts. The RMSDiodine and IBiodine decreased as the tube "A" voltage of the kVp pair increased.Conclusion:The kVp pair of 70/Sn150 led to better image quality in VMIs and sufficient iodine accuracy.

Mots clés: Contrast-to-noise ratio; Dual-Source CT scan; Iodine quantification; Virtual monochromatic images

Domaines: Imagerie; Médecine nucléaire; Médecine humaine et pathologie

Djamel Dabli, Julien Frandon, Aymeric Hamard, Asmaa Belaouni, Takieddine Addala, et al.. Optimization of image quality and accuracy of low iodine concentration quantification as function of kVp pairs for abdominal imaging using dual-source CT: A phantom study. Physica Medica, 2021, 88, pp.285-292. ⟨10.1016/j.ejmp.2021.07.008⟩. ⟨hal-03630648⟩