体外胆石的CT分类和化学成分关系的研究

目的：探讨体外胆石的ＣＴ分类和化学成分的关系。材料和方法：６０例胆石标本进行体外ＣＴ扫描，以红外光谱仪定量分析所有结石的四种主要化学成分。结果：胆石分成５类；胆石的ＣＴ类型与其化学成分及形态特点密切相关；胆石的ＣＴ值与其胆固醇含量成显著负相关（ｒ＝－０．６３），而与碳酸钙的含量成显著正相关（ｒ＝０．６５）；胆固醇和非胆固醇性结石的ＣＴ值有显著差异，以ＣＴ值－５０Ｈｕ为两者的判断界值，其敏感性和特异性分别为９０％及９７．５％。结论：ＣＴ能准确预测胆石的化学性质和形态特点。

Study on Correlation of Computed Tomographic Classification of Gallstones with Chemical Composition in Vitro

Purpose:To investigate relationship between computed tomographic classification of gallstones and chemical composition in vitro. Materials and Methods: 60 gallstones were scaned by CT invitro and four main chemical compositions of every stone were analysed qualitatively by infrared spectrum. Results: Gallstones were devided into five patterns and a close relationship between CT patterns of gallstones and their chemical composition was found. There was a negative linear correlation between CT values and cholesterol content, but positive linear correlation between CT values and calcium carbonate content. The CT values was significantly different between cholesterol and noncholesterol stones. A CT value -50HU was selected as a cut off point of cholesterol stones and the sensitivity and specificity were 90% and 97.5% respectively. Conclusion: CT scans can predict the chemical composition and character of gallstones accurately in vitro.