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Influence of residual gadolinium contrast agent on abdominal CT images
- JIANG Wei, WANG Zhi-hui, CHEN Xin-yin, HONG Qing-wen, YUAN Xiao-ping
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2021, 21(03):
341-344.
DOI: 10.3969/j.issn.1009-976X.2021.03.019
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Objective To explore the effect of gadolinium contrast agent residue on abdominal CT images and the duration of action, in order to help optimize the imaging examination schedule of patients. Methods First, a set of reasonable and scientifically rigorous screening criteria was established to ensure that the same patient had more than two abdominal CT examinations with and without gadolinium contrast agent residue. Second, by retrospective analysis, 200 cases of upper abdominal CT examination were collected from the RIS system of our hospital, and 135 cases were selected according to the screening criteria. Third, in the same client with gadolinium contrast agent residue abdominal CT image tag for Ⅰ group, as the experimental group; Without gadolinium contrast agent residue of abdominal CT image tag for Ⅱ group, as the control group. Fourth, respectively, in the group of Ⅰ and Ⅱ abdominal CT image sampling survey, the area of liver, spleen, pancreas, kidney has undergone three CT value measure, take the average. Fifth, according to the gadolinium contrast agent residual time T on subdividing Ⅰ group and divided into group A （1 h,84 cases）, group B （2 h,36 cases）, group C（3 h,13 case） and group D （4 h,2 cases）. Sixth, Paired sample T test analysis Ⅰ and Ⅱ group of the areas of liver, spleen, pancreas, kidney difference between the CT value; One-way ANOVA and rank-sum tests were used to analyze the relationship between CT value and time T in the areas of liver, spleen, pancreas and kidney in group A, B, C and D. Results Ⅰ and Ⅱ group in the areas of liver, spleen, left renal medulla and left renal pelvis, right kidney medulla, right renal pelvis that there was a significant difference between CT value and Ⅰ group and Ⅱ pancreatic area there was no significant difference between CT value;In Ⅰ group. There was no relationship among group A, B, C and D in duration T. Conclusion Residual gadolinium contrast agent for abdomen CT values have a significant effect on most organs, have no obvious attenuation in 4 hours, especially in the kidney area （renal medulla, renal pelvis） of CT value was significantly increased, and the residue of gadolinium contrast medium are displayed the high-density shadow in CT image, directly affect the observation of the lesions, and even result in missed diagnosis and misdiagnosis. Therefore, abdominal CT examination within 4 hours after MR enhancement is not recommended, so as not to affect the evaluation and diagnosis of the patient′s condition by clinicians and radiologists.
