摘要
Abstract
Objective:To investigate the clinical value of dual-source CT (DSCT) in optimizing normal gastric images. Methods:62 patients without gastric diseases confirmed by endoscopy underwent abdominal plain scan and enhanced scan. Among them ,a total of 32 cases underwent DSCT scanning was regarded as an experimental group (DE group). 30 patients underwent conven-tional scanning were treated as a control group (NDE group). The lesser curvature of fundus was chosen as gastric ROI 1,the greater curvature of stomach as gastric ROI 2,the lesser curvature of antrum as gastric ROI 3. And the three fat regions near to the gastric ROIs were chosen as fat ROI 1,fat ROI 2,fat ROI 3,respectively. The differences of signal to noise ratio (SNR), contrast to noise ratio (CNR),subjective scoring,volume CT dose index,the dose length product (DLP) and effective dose (ED) between DE group and NDE group were compared. Results:①In DE group,the images in 100 kV compared with those in 140 kV, SNR of the former of gastric ROI 1 and 3 were higher than that in 140 kV ,and there were statistically significant differences (P<0.05). Gastric ROI 2 existed large measurement error,there was no statistically significant differences (P>0.05). SNR in 100 kV of fat ROI 1 and 2 were higher than that in 140 kV,and there were statistically significant differences (P<0.05). Fat ROI 3 exist-ed large measurement error,there was no statistically significant difference (P>0.05). ②In DE group,the images of arterial phase compared with those of venous phase,SNR in 100 kV of gastric ROI 1 and 3 were higher than that in 140 kV (P<0.05),while there was no significant difference for SNR of ROI 2 (P>0.05). SNR in 100 kV of fat ROI 1,2 and 3 were compared with that in 140 kV,there were no significant differences (P>0.05). ③The baseline characteristics and subjective scores between DE group and NDE group had no statistically significant differences. The radiation dose in 100 kV significantly reduced than that in 140 kV (t=-12.58,P=0.000). Conclusions:This study shows that DSCT can assess the T staging of gastric cancer from parameter quan-tization through different objective and subjective evaluation of the gastric ROI and fat ROI. Low-voltage imaging can improve the image quality,reduce the radiation dose,so that optimize the image.关键词
胃/体层摄影术,X线计算机/辐射剂量Key words
Stomach/Tomography,X-ray computed/Radiation dosage
