ObjectiveTo explore the application value of low-tube-voltage combined with iterative model reconstruction(IMR) technique in the contrast-enhanced CT of gastric cancer.
MethodsThe upper abdominal CT scanning and dynamic enhanced scan in 54 gastric cancer patients were examined, and the 26 patients treated with IMR reconstruction and 28 patients treated with filtered back projection(FBP) reconstruction were divided into the observation group and control group, respectively.The portal vein phase scan data in two groups were collected, and the subjective evaluation, objective evaluation and effective dose comparison of the images in two groups were carried out.The postoperative pathology results were set as the gold standard, the coincidence rate of CT enhanced T staging was compared between two groups.
ResultsThe CT volumetric dose index, CT dose-length product and effective dose in observation group were significantly lower than those in control group(P < 0.01), and the image signal-to-noise ratio and contrast-to-noise ratio in observation group were significantly higher than those in control group(P < 0.01).The differences of the low contrast resolution and lesion edge sharpness between two groups were statistically significant(P < 0.05), while there was no statistical significance in image distortion between two groups(P>0.05).The coincidence rate of CT enhanced T staging in observation group(88.46%) was higher than that in control group(64.29%) (P < 0.05).
ConclusionsThe low-tube-voltage combined with IMR in the contrast-enhanced CT of gastric cancer can not only reduce the radiation dose and improve the image quality, but also help to improve the preoperative T-stage diagnosis coincidence rate of gastric cancer.
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