Preliminary Application of Dual-energy Dual-source CT Virtual Non-contrast Imaging in Colorectal Lesions
10.3969/j.issn.1005-5185.2014.10.012
- VernacularTitle:双源CT双能量虚拟平扫在结直肠病变的应用
- Author:
Yong WANG
;
Jing LEI
;
Dan HAN
;
Wei ZHAO
;
Shiping YANG
;
Qian XIONG
- Publication Type:Journal Article
- Keywords:
Colonic neoplasms;
Tomography,X-ray computed;
Dual-energy virtual non-contrast technique;
Radiation dosage
- From:
Chinese Journal of Medical Imaging
2014;(10):768-771
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To assess the feasibility of applying dual-energy dual-source CT virtual non-contrast (VNC) imaging in the diagnosis of colorectal diseases. Materials and Methods Eighty-ifve patients with clinically suspected colorectal lesions underwent abdominal CT scan as well as arterial and venous phase dual-energy enhanced scan, VCN images of arterial and venous phase were obtained using the dual-energy software, the differences of image quality, radiation dose and diagnostic coincidence rate between the true non-contrast scan and VNC images were compared. Results The radiation dose of two-phase dual-energy scan was 34.8%lower when compared with the conventional three-phase scans. The CT values of the intestinal lesions, metastasis lymph nodes and intestinal fat in VNC were lower than the true unenhanced scan (P<0.05 or P<0.01), whereas were higher than the real scan in liver and liver metastases (P<0.01), there was no signiifcant difference of VNC between the arterial and venous phase. Differences of intestinal wall thickness, metastasis lymph node size, peripheral invasion and liver metastases observed from real non-contrast scan and VNC were not statistically significant (P>0.05), and neither was the diagnostic coincidence rate for intestinal diseases (P>0.05). The noise level of images obtained from VNC was lower than that of the real non-contrast scan (P<0.05), with higher SNR and CNR, there was no signiifcant difference of image scoring among the three groups (P>0.05). Conclusion For colorectal lesions, the virtual non-contrast images from the dual-energy dual-source CT scan can be used to reduce the radiation dose without effecting image quality and diagnosis accuracy.
