Virtual non-contrast images combined with 40 keV virtual monoenergetic images for reducing radiation dose of CT enterography based on dual-layer spectral detector CT
10.13929/j.issn.1003-3289.2023.12.032
- VernacularTitle:双层探测器光谱CT虚拟平扫联合40keV虚拟单能量成像用于降低小肠CT造影辐射剂量
- Author:
Jiao YIN
1
;
Xi WEI
;
Chao PENG
;
Yaying YANG
Author Information
1. 昆明医科大学第一附属医院医学影像科,云南昆明 650032
- Keywords:
inflammatory bowel diseases;
computed tomography angiography;
radiation dosage
- From:
Chinese Journal of Medical Imaging Technology
2023;39(12):1883-1887
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the value of virtual non-contrast(VNC)image combined with 40 keV virtual monoenergetic image(VMI)for reducing radiation dose of CT enterography(CTE)based on dual-layer spectral detector CT(DLCT).Methods Data of 63 patients with inflammatory bowel disease(IBD)who underwent CT true non-contrast(TNC)scanning and dual-phase contrast scanning were retrospectively analyzed.CT values,noise(SD),signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR)of lesion/tissue/structure on TNC,conventional arterial and venous phase,VNC of arterial and venous phase(VNCa and VNCv)and 40 keV VMI images were measured,and dose-length product(DLP),volume CT dose index(CTDIvol)and effective dose(ED)were calculated,respectively.Objective evaluation was performed to compare TNC and VNC,also between conventional arterial phase and 40 keV VMI.Subjective score and radiation dose were compared between conventional CT and VNC combined with 40 keV VMI.Results No significant difference of CT values of involved intestinal wall,non-involved intestinal wall nor psoas major muscle was found among TNC,VNCa and VNCv images(all P＞0.05).CT values,SNR and CNR of involved intestinal wall,non-involved intestinal wall and psoas major muscle on 40 keV VMI images were all higher than those on conventional arterial phase CT images(all P＜0.05).The subjective score of conventional CT and VNCv combined with 40 keV VMI images was 4(4,5)and 4(4,5),without significant difference(P＞0.05).Compared with conventional CT scanning,radiation dose of CTE using VNCv combined with 40 keV VMI decreased about 67.53％.Conclusion DLCT VNC combined with 40 keV VMI could reduce radiation dose of CTE.
