低管电压技术在泌尿系统MSCT多期扫描中的应用价值

The Application Value of Low Voltage Technology in MSCT Multi-phase Scanning of Urinary System

目的研究通过降低管电压的方式减少患者泌尿系统MSCT多期扫描中所接受的X线辐射剂量,最大限度降低医源性辐射损伤。方法将所纳入患者分为3个小组,每组15例。第一组患者,扫描的参数固定为电压120Kv,电流120mAs;第二组患者,电压90Kv,电流120mAs;第三组患者:电压60Kv,电流120mAs。然后对患者进行泌尿系统MSCT多期扫描,统计每次扫描的X线剂量。结果三组患者所接受X线辐射剂量分别为:第一组(120Kv)10.358±0.43mGy;第二组(90Kv)7.160±0.19mGy;第三组(60Kv)3.916±0.27mGy。经过统计学分析三组的差异具有统计学意义。对图像质量进行分析:第一组(120Kv/120mAs)图像质量:良好的14例,合格的1例,没有不合格的;第二组(90Kv/120mAs)图像质量:良好的10例,合格的5例,没有不合格的;第三组(60Kv/120mAs)图像质量:良好的3例,合格的12例,没有不合格的。经过统计学分析三组的差异没有统计学意义。结论该研究通过降低管电压明显降低了患者泌尿系统检查过程中所接受的X线辐射剂量,且对图像的临床应用影响不大。

Objective This study was designed to reduce X-ray radiation dose received in MSCT multi-phase scanning of urinary system by reducing the tube voltage, in order to minimize iatrogenic radiation injury. Methods All the patients were divided into 3 groups, each group of 15 cases. The first group of patients, scanning parameters was set at 120Kv, the current 120mAs;the second group of patients, voltage 90 Kv, current 120mAs;third group of patients, voltage was 60 Kv, current 120mAs. Each of X-ray dose was measured after MSCT multi-phase scanning of urinary system. Results X-ray radiation doses of three groups patients received was respectively：the first group （120kv） 10.358±0.43 mGy, the second group （90kv） 7.16±0.19 mGy; a third group （60kv） 3.916±0.27 mGy. The radiation doses difference of the three groups received was statistically significant. Analysis of Image Quality：The first group （120kv/120mas） Image Quality：Good 14 cases, 1 cases of qualified, there was no unqualified; the second group （90kv/120mas） Image Quality：Good 10 cases, 5 cases of qualified, there was no unqualified;a third group （60kv/120mas） Image Quality： Good 3 cases, 12 cases of qualified, there was no unqualified. Through statistical analysis of the three groups of difference was not statistically significant. Conclusion Lower votage can reduce the radiation doses significantly during the process of urinary system scanning, and the clinical application of image was little influenced.