目的：探讨腰椎间盘CT轴位扫描中根据腰围个体化降低管电流的可行性和方法。方法：取猪腰部脊柱段，做成60～110 cm腰围的CT模型。其它扫描参数不变，以10～130 mA扫描腰椎间盘，得出图像质量合格的管电流值。选择2015年3—7月来我院接受腰椎间盘CT检查的患者350名，随机分为常规剂量组和低剂量组。常规剂量组患者50例，低剂量组患者300例，两组患者在年龄、身高、体质量的差异无统计学意义。常规剂量组采用130 mA扫描，低剂量组采用图像质量合格的不同腰围腰椎模型的管电流值增加10 mA进行扫描，比较两组CT扫描辐射剂量，采用直线回归分析腰围与管电流关系。结果：低剂量组CTDIvol较常规剂量组低73.39%，DLP低73.40%，二者比较差异具有统计学意义。以管电流为自变量，腰围为因变量，得出回归方程：y=0.498x+47.86，R2=0.881。结论：CT扫描前根据受检者腰围调整扫描时管电流，操作简单，充分体现CT检查辐射剂量控制的个体化和可操作性，具有临床实用意义。
Abstract
Objective: To explore the possibilities and methods of reducing the tube current personalized based on the waist in CT axial scanning of lumbar intervertebral disc. Methods: The CT model of 60～110 cm waistline was made of porcine lumbar spine. The lumbar intervertebral disc was scanned with 10～130 mA and other scanning parameters were unchanged. The tube current value was obtained when the image quality was standard. 350 cases undergoing CT scanning of lumbar intervertebral disc in our hospital from March to July in 2015 were enrolled. All patients were randomly divided into two groups: conventional-dose group and low-dose group. The conventional-dose group consisted of 50 patients and the low-dose group consisted of 300 cases. There was no statistically significant difference between the two groups in age, height and weight. The lumbar intervertebral disc was scanned with 130 mA in conventional-dose group, and that in low-dose group was scanned with the tube current value increased by 10 mA, which was obtained with image of quality standards in waist lumbar model of different waistline. The dose of CT scan radiation was compared between two groups. The relationship between waistline and the tube current was analysed using linear regression. Results: The CTDIvol was lower 73.39%, and the DLP 73.40% in low-dose group comparing the conventional-dose group, the difference was statistically significant. The regression equation y=0.498x+47.86, R2=0.881 was derived with the tube current as argument and waistline as the dependent variable. Conclusion: The operation of adjustment of the tube current according to the waistline of patients before CT scan is simple, the individuation and maneuverability of CT radiation dose control is fully embodies. There is clinically practical significance.
关键词
椎间盘 /
腰椎 /
体层摄影术 /
螺旋计算机
Key words
Intervertebral disk /
Lumbar vertebrae /
Tomography, spiral computed
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