CAJ | 학술논문

目的探讨牙齿螺旋CT扫描时降低kV、mA值患者接受的射线剂量及其对图像质量的影响.方法随机表法将30例口腔正畸患者分为常规剂量组(120 kV、200 mA)、低kV组(80 kV、200 mA)和低mA组(120 kV、80 mA).扫描时记录容积CT剂量指数(CTDI)及扫描长度,并计算出平均剂量长度乘积(DLP).对不同扫描参数的图像质量评分进行统计学分析.结果常规剂量组、低kV组和低mA组的CTDI值分别为43.6、15.0和17.5 mGy,DLP分别为(375.40±13.99)、(128.10±6.30)和(151.90±6.00)mGy·cm,各组图像质量评分差异无统计学意义.结论牙齿低剂量螺旋CT扫描技术,尤其是低kV扫描,既显著减少辐射剂量,又能保证图像质量.
목적 탐토아치라선CT소묘시강저kV、mA치환자접수적사선제량급기대도상질량적영향.방법 수궤표법장30례구강정기환자분위상규제량조(120 kV、200 mA)、저kV조(80 kV、200 mA)화저mA조(120 kV、80 mA).소묘시기록용적CT제량지수(CTDI)급소묘장도,병계산출평균제량장도승적(DLP).대불동소묘삼수적도상질량평분진행통계학분석.결과 상규제량조、저kV조화저mA조적CTDI치분별위43.6、15.0화17.5 mGy,DLP분별위(375.40±13.99)、(128.10±6.30)화(151.90±6.00)mGy·cm,각조도상질량평분차이무통계학의의.결론 아치저제량라선CT소묘기술,우기시저kV소묘,기현저감소복사제량,우능보증도상질량.
Objective To determine the effect of reducing the value of mA or kV on the image quality and the radiation dose of the patients undergoing low-dose spiral CT for orthodontics.Methods Thirty patients were divided into three groups,each group has 10 patients.They were group 1(80 kV and 200 mA),group 2 (120 kV and 80 mA),group 3(120 kV and 200 mA)The volume CT dose index(CTDI)was recorded and the average dose-length produce(DLP)was calculated in three groups,respectively.Image quality of three groups were compared and scored by two radiologists,and the results were statistically analysed.Results The CTDI among three groups in diagnostic image quality.Conclusions Low-dose spiral CT for orthodontics,especially the low-kV scan,may decrease the radiation exposure and guarantee the image quality.