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目的评价冠状血管造影术(CAG)患者的辐射剂量及其影响因素。方法对190例接受CAG检查的患者进行回顾性分析,使用剂量转换因数计算患者的有效剂量(ED),并分析患者体质量指数(BMI)、穿刺入路、透视时间、采集帧数及血管病变与患者ED的相关性。结果患者的平均累计剂量(DOSE)为400.54mGy,平均总剂量面积乘积(DAP)为28.26Gy.cm2,平均ED为5.23mSv。透视时间、BMI及采集帧数的回归系数分别为0.757、0.442、0.012,差异有统计学意义(P<0.05)。结论肥胖、透视时间长和高采集帧数为CAG检查中的辐射剂量增加重要因素,熟练的术者及采用降低采集帧数的新技术,可有效降低辐射剂量。
Objective To evaluate the radiation dose and its influential factors in patients undergoing coronary angiography (CAG). Methods A total of 190 patients undergoing CAG examination were retrospectively analyzed. The effective dose (ED) was calculated using the dose conversion factor. The body mass index (BMI), puncture approach, fluoroscopy time, number of acquisition frames and vascular lesions Correlation with patient ED. Results The patient’s average cumulative dose (DOSE) was 400.54 mGy with an average total dose area product (DAP) of 28.26 Gy.cm2 and an average ED of 5.23 mSv. The regression coefficients of fluoroscopy time, BMI and acquisition frames were 0.757, 0.442 and 0.012 respectively, with significant difference (P <0.05). Conclusions Obese, long time of fluoroscopy and high acquisition frame number are the important factors for increasing radiation dosage in CAG examination. Skilled persons and new techniques of reducing the number of acquisition frames can effectively reduce the radiation dose.