A Preliminary Study of Energy Spectrum CT on Showing Feeding Arteries of Gastrointestinal Tract Malignant Tumors with Low Concentration Contrast Medium
10.3969/j.issn.1005-5185.2015.07.011
- VernacularTitle:能谱CT低浓度对比剂最佳单能量成像显示胃肠道恶性肿瘤供血动脉的研究
- Author:
Shifeng TIAN
;
Ailian LIU
;
Jinghong LIU
;
Anliang CHEN
;
Ye LI
;
Yijun LIU
- Publication Type:Journal Article
- Keywords:
Gastrointestinal neoplasms;
Tomography,X-ray computed;
Angiography;
Contrast media;
Plasma concentration;
Image processing,computer-assisted
- From:
Chinese Journal of Medical Imaging
2015;(7):517-522
- CountryChina
- Language:Chinese
-
Abstract:
PurposeTo investigate the effects of the low concentration contrast medium combined with optimal single source spectral imaging on displaying feeding arteries of gastrointestinal tract malignant tumors.Materials and Methods Seventy-one patients of body mass index (BMI) >25 kg/m2 with gastrointestinal tract malignant tumors were prospectively studied. All the cases were randomly divided into two groups: high concentration group (33 cases with high concentration contrast medium of 350 mgI/ml in routine scan) and low concentration group (38 cases with low concentration contrast medium of 270 mgI/ml in optimal single source spectral imaging). The optimal single source images were generated automatically. The subjective image scores, CT value of the tumor feeding arteries, image noise, contrast-to-noise ratio (CNR) and CT dose index of volume (CTDIvol) of optimal single source spectral images in two groups were compared. Results The optimal single source of low concentration group were 51-60 keV. The subjective image score of low concentration group was higher than high concentration group (Z=-4.280,P<0.01). The consistency between the two investigators was good (Kappa=0.824 and 0.843,P<0.05). The consistency between the two investigators in evaluating CT value of the tumor feeding arteries, CT value at the right erector spinal muscle, image noise and CNR data was good (ICChigh concentration group=0.998, 0.968, 0.959 and 0.990; ICClow concentration group=0.988, 0.981, 0.969 and 0.937). The CT values of the tumor feeding arteries and CNR of the low concentration group were higher than that of the high concentration group, but the image noise was lower than that of high concentration group (t=-14.937, 4.263 and-17.264,P<0.01). There was no statistical difference of CTDIvol between the two groups (t=1.278,P>0.05).Conclusion The low concentration contrast medium with optimal single source spectral imaging in patients with large BMI may improve CTA image quality of feeding arteries of gastrointestinal tract malignant tumors without increasing radiation dose.
